diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs
index 8a17ac90a02..0ca9c12f4c1 100644
--- a/compiler/rustc_ast_passes/src/feature_gate.rs
+++ b/compiler/rustc_ast_passes/src/feature_gate.rs
@@ -279,7 +279,7 @@ impl<'a> PostExpansionVisitor<'a> {
                 if let ast::TyKind::ImplTrait(..) = ty.kind {
                     gate_feature_post!(
                         &self.vis,
-                        type_alias_impl_trait,
+                        min_type_alias_impl_trait,
                         ty.span,
                         "`impl Trait` in type aliases is unstable"
                     );
diff --git a/compiler/rustc_feature/src/active.rs b/compiler/rustc_feature/src/active.rs
index ee2fce34b0b..79ec9c26499 100644
--- a/compiler/rustc_feature/src/active.rs
+++ b/compiler/rustc_feature/src/active.rs
@@ -638,6 +638,9 @@ declare_features! (
     /// Allows `pub` on `macro_rules` items.
     (active, pub_macro_rules, "1.52.0", Some(78855), None),
 
+    /// Allows the use of type alias impl trait in function return positions
+    (active, min_type_alias_impl_trait, "1.52.0", Some(63063), None),
+
     /// Allows associated types in inherent impls.
     (active, inherent_associated_types, "1.52.0", Some(8995), None),
 
@@ -670,6 +673,7 @@ pub const INCOMPLETE_FEATURES: &[Symbol] = &[
     sym::capture_disjoint_fields,
     sym::const_generics_defaults,
     sym::inherent_associated_types,
+    sym::type_alias_impl_trait,
 ];
 
 /// Some features are not allowed to be used together at the same time, if
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
index 38a3a4e3d44..aff66053c93 100644
--- a/compiler/rustc_feature/src/removed.rs
+++ b/compiler/rustc_feature/src/removed.rs
@@ -106,7 +106,7 @@ declare_features! (
      Some("subsumed by `.await` syntax")),
     /// Allows defining `existential type`s.
     (removed, existential_type, "1.38.0", Some(63063), None,
-     Some("removed in favor of `#![feature(type_alias_impl_trait)]`")),
+     Some("removed in favor of `#![feature(min_type_alias_impl_trait)]`")),
     /// Allows using the macros:
     /// + `__diagnostic_used`
     /// + `__register_diagnostic`
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 4fcb8b6c1b7..7bd1a21cc91 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -736,6 +736,7 @@ symbols! {
         min_const_generics,
         min_const_unsafe_fn,
         min_specialization,
+        min_type_alias_impl_trait,
         minnumf32,
         minnumf64,
         mips_target_feature,
diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index a70812bd13c..bde75031f61 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -142,7 +142,8 @@
 #![feature(alloc_layout_extra)]
 #![feature(trusted_random_access)]
 #![feature(try_trait)]
-#![feature(type_alias_impl_trait)]
+#![cfg_attr(bootstrap, feature(type_alias_impl_trait))]
+#![cfg_attr(not(bootstrap), feature(min_type_alias_impl_trait))]
 #![feature(associated_type_bounds)]
 #![feature(slice_group_by)]
 #![feature(decl_macro)]
diff --git a/src/test/rustdoc-ui/error-in-impl-trait/trait-alias-closure.rs b/src/test/rustdoc-ui/error-in-impl-trait/trait-alias-closure.rs
index 31dd786cbbf..3e7b4280234 100644
--- a/src/test/rustdoc-ui/error-in-impl-trait/trait-alias-closure.rs
+++ b/src/test/rustdoc-ui/error-in-impl-trait/trait-alias-closure.rs
@@ -1,5 +1,5 @@
 // check-pass
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 
 pub trait ValidTrait {}
 type ImplTrait = impl ValidTrait;
diff --git a/src/test/rustdoc-ui/error-in-impl-trait/trait-alias.rs b/src/test/rustdoc-ui/error-in-impl-trait/trait-alias.rs
index c18a024af4b..7ebf4d544de 100644
--- a/src/test/rustdoc-ui/error-in-impl-trait/trait-alias.rs
+++ b/src/test/rustdoc-ui/error-in-impl-trait/trait-alias.rs
@@ -1,5 +1,5 @@
 // check-pass
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 
 pub trait ValidTrait {}
 type ImplTrait = impl ValidTrait;
diff --git a/src/test/rustdoc/auxiliary/issue-73061.rs b/src/test/rustdoc/auxiliary/issue-73061.rs
index e05a3bc6d91..9b4129e771f 100644
--- a/src/test/rustdoc/auxiliary/issue-73061.rs
+++ b/src/test/rustdoc/auxiliary/issue-73061.rs
@@ -1,6 +1,6 @@
 //edition:2018
 
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 
 pub trait Foo {
     type X: std::future::Future<Output = ()>;
diff --git a/src/test/rustdoc/impl-trait-alias.rs b/src/test/rustdoc/impl-trait-alias.rs
index 54c3f856ddb..bf73a833580 100644
--- a/src/test/rustdoc/impl-trait-alias.rs
+++ b/src/test/rustdoc/impl-trait-alias.rs
@@ -1,4 +1,4 @@
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 
 trait MyTrait {}
 impl MyTrait for i32 {}
diff --git a/src/test/rustdoc/return-impl-trait.rs b/src/test/rustdoc/return-impl-trait.rs
index 1ccf5ac4611..da4945aadf7 100644
--- a/src/test/rustdoc/return-impl-trait.rs
+++ b/src/test/rustdoc/return-impl-trait.rs
@@ -1,4 +1,4 @@
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 
 pub trait Backend {}
 
diff --git a/src/test/ui/associated-type-bounds/duplicate.full_tait.stderr b/src/test/ui/associated-type-bounds/duplicate.full_tait.stderr
new file mode 100644
index 00000000000..bde2d034e25
--- /dev/null
+++ b/src/test/ui/associated-type-bounds/duplicate.full_tait.stderr
@@ -0,0 +1,572 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/duplicate.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/duplicate.rs:8:12
+   |
+LL | #![feature(impl_trait_in_bindings)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:13:36
+   |
+LL | struct SI1<T: Iterator<Item: Copy, Item: Send>> { f: T }
+   |                        ----------  ^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:15:36
+   |
+LL | struct SI2<T: Iterator<Item: Copy, Item: Copy>> { f: T }
+   |                        ----------  ^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:17:39
+   |
+LL | struct SI3<T: Iterator<Item: 'static, Item: 'static>> { f: T }
+   |                        -------------  ^^^^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:19:45
+   |
+LL | struct SW1<T> where T: Iterator<Item: Copy, Item: Send> { f: T }
+   |                                 ----------  ^^^^^^^^^^ re-bound here
+   |                                 |
+   |                                 `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:21:45
+   |
+LL | struct SW2<T> where T: Iterator<Item: Copy, Item: Copy> { f: T }
+   |                                 ----------  ^^^^^^^^^^ re-bound here
+   |                                 |
+   |                                 `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:23:48
+   |
+LL | struct SW3<T> where T: Iterator<Item: 'static, Item: 'static> { f: T }
+   |                                 -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                 |
+   |                                 `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:26:34
+   |
+LL | enum EI1<T: Iterator<Item: Copy, Item: Send>> { V(T) }
+   |                      ----------  ^^^^^^^^^^ re-bound here
+   |                      |
+   |                      `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:28:34
+   |
+LL | enum EI2<T: Iterator<Item: Copy, Item: Copy>> { V(T) }
+   |                      ----------  ^^^^^^^^^^ re-bound here
+   |                      |
+   |                      `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:30:37
+   |
+LL | enum EI3<T: Iterator<Item: 'static, Item: 'static>> { V(T) }
+   |                      -------------  ^^^^^^^^^^^^^ re-bound here
+   |                      |
+   |                      `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:32:43
+   |
+LL | enum EW1<T> where T: Iterator<Item: Copy, Item: Send> { V(T) }
+   |                               ----------  ^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:34:43
+   |
+LL | enum EW2<T> where T: Iterator<Item: Copy, Item: Copy> { V(T) }
+   |                               ----------  ^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:36:46
+   |
+LL | enum EW3<T> where T: Iterator<Item: 'static, Item: 'static> { V(T) }
+   |                               -------------  ^^^^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:39:35
+   |
+LL | union UI1<T: Iterator<Item: Copy, Item: Send>> { f: T }
+   |                       ----------  ^^^^^^^^^^ re-bound here
+   |                       |
+   |                       `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:41:35
+   |
+LL | union UI2<T: Iterator<Item: Copy, Item: Copy>> { f: T }
+   |                       ----------  ^^^^^^^^^^ re-bound here
+   |                       |
+   |                       `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:43:38
+   |
+LL | union UI3<T: Iterator<Item: 'static, Item: 'static>> { f: T }
+   |                       -------------  ^^^^^^^^^^^^^ re-bound here
+   |                       |
+   |                       `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:45:44
+   |
+LL | union UW1<T> where T: Iterator<Item: Copy, Item: Send> { f: T }
+   |                                ----------  ^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:47:44
+   |
+LL | union UW2<T> where T: Iterator<Item: Copy, Item: Copy> { f: T }
+   |                                ----------  ^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:49:47
+   |
+LL | union UW3<T> where T: Iterator<Item: 'static, Item: 'static> { f: T }
+   |                                -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:52:32
+   |
+LL | fn FI1<T: Iterator<Item: Copy, Item: Send>>() {}
+   |                    ----------  ^^^^^^^^^^ re-bound here
+   |                    |
+   |                    `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:54:32
+   |
+LL | fn FI2<T: Iterator<Item: Copy, Item: Copy>>() {}
+   |                    ----------  ^^^^^^^^^^ re-bound here
+   |                    |
+   |                    `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:56:35
+   |
+LL | fn FI3<T: Iterator<Item: 'static, Item: 'static>>() {}
+   |                    -------------  ^^^^^^^^^^^^^ re-bound here
+   |                    |
+   |                    `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:58:43
+   |
+LL | fn FW1<T>() where T: Iterator<Item: Copy, Item: Send> {}
+   |                               ----------  ^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:60:43
+   |
+LL | fn FW2<T>() where T: Iterator<Item: Copy, Item: Copy> {}
+   |                               ----------  ^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:62:46
+   |
+LL | fn FW3<T>() where T: Iterator<Item: 'static, Item: 'static> {}
+   |                               -------------  ^^^^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:68:40
+   |
+LL | fn FAPIT1(_: impl Iterator<Item: Copy, Item: Send>) {}
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:70:40
+   |
+LL | fn FAPIT2(_: impl Iterator<Item: Copy, Item: Copy>) {}
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:72:43
+   |
+LL | fn FAPIT3(_: impl Iterator<Item: 'static, Item: 'static>) {}
+   |                            -------------  ^^^^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:75:39
+   |
+LL | const CIT1: impl Iterator<Item: Copy, Item: Send> = iter::empty();
+   |                           ----------  ^^^^^^^^^^ re-bound here
+   |                           |
+   |                           `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:77:39
+   |
+LL | const CIT2: impl Iterator<Item: Copy, Item: Copy> = iter::empty();
+   |                           ----------  ^^^^^^^^^^ re-bound here
+   |                           |
+   |                           `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:79:42
+   |
+LL | const CIT3: impl Iterator<Item: 'static, Item: 'static> = iter::empty();
+   |                           -------------  ^^^^^^^^^^^^^ re-bound here
+   |                           |
+   |                           `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:81:40
+   |
+LL | static SIT1: impl Iterator<Item: Copy, Item: Send> = iter::empty();
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:83:40
+   |
+LL | static SIT2: impl Iterator<Item: Copy, Item: Copy> = iter::empty();
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:85:43
+   |
+LL | static SIT3: impl Iterator<Item: 'static, Item: 'static> = iter::empty();
+   |                            -------------  ^^^^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:88:46
+   |
+LL | fn lit1() { let _: impl Iterator<Item: Copy, Item: Send> = iter::empty(); }
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:90:46
+   |
+LL | fn lit2() { let _: impl Iterator<Item: Copy, Item: Copy> = iter::empty(); }
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:92:49
+   |
+LL | fn lit3() { let _: impl Iterator<Item: 'static, Item: 'static> = iter::empty(); }
+   |                                  -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:95:35
+   |
+LL | type TAI1<T: Iterator<Item: Copy, Item: Send>> = T;
+   |                       ----------  ^^^^^^^^^^ re-bound here
+   |                       |
+   |                       `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:97:35
+   |
+LL | type TAI2<T: Iterator<Item: Copy, Item: Copy>> = T;
+   |                       ----------  ^^^^^^^^^^ re-bound here
+   |                       |
+   |                       `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:99:38
+   |
+LL | type TAI3<T: Iterator<Item: 'static, Item: 'static>> = T;
+   |                       -------------  ^^^^^^^^^^^^^ re-bound here
+   |                       |
+   |                       `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:101:44
+   |
+LL | type TAW1<T> where T: Iterator<Item: Copy, Item: Send> = T;
+   |                                ----------  ^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:103:44
+   |
+LL | type TAW2<T> where T: Iterator<Item: Copy, Item: Copy> = T;
+   |                                ----------  ^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:105:47
+   |
+LL | type TAW3<T> where T: Iterator<Item: 'static, Item: 'static> = T;
+   |                                -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:108:36
+   |
+LL | type ETAI1<T: Iterator<Item: Copy, Item: Send>> = impl Copy;
+   |                        ----------  ^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:110:36
+   |
+LL | type ETAI2<T: Iterator<Item: Copy, Item: Copy>> = impl Copy;
+   |                        ----------  ^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:112:39
+   |
+LL | type ETAI3<T: Iterator<Item: 'static, Item: 'static>> = impl Copy;
+   |                        -------------  ^^^^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:114:40
+   |
+LL | type ETAI4 = impl Iterator<Item: Copy, Item: Send>;
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:116:40
+   |
+LL | type ETAI5 = impl Iterator<Item: Copy, Item: Copy>;
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:118:43
+   |
+LL | type ETAI6 = impl Iterator<Item: 'static, Item: 'static>;
+   |                            -------------  ^^^^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:121:36
+   |
+LL | trait TRI1<T: Iterator<Item: Copy, Item: Send>> {}
+   |                        ----------  ^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:123:36
+   |
+LL | trait TRI2<T: Iterator<Item: Copy, Item: Copy>> {}
+   |                        ----------  ^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:125:39
+   |
+LL | trait TRI3<T: Iterator<Item: 'static, Item: 'static>> {}
+   |                        -------------  ^^^^^^^^^^^^^ re-bound here
+   |                        |
+   |                        `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:127:34
+   |
+LL | trait TRS1: Iterator<Item: Copy, Item: Send> {}
+   |                      ----------  ^^^^^^^^^^ re-bound here
+   |                      |
+   |                      `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:129:34
+   |
+LL | trait TRS2: Iterator<Item: Copy, Item: Copy> {}
+   |                      ----------  ^^^^^^^^^^ re-bound here
+   |                      |
+   |                      `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:131:37
+   |
+LL | trait TRS3: Iterator<Item: 'static, Item: 'static> {}
+   |                      -------------  ^^^^^^^^^^^^^ re-bound here
+   |                      |
+   |                      `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:133:45
+   |
+LL | trait TRW1<T> where T: Iterator<Item: Copy, Item: Send> {}
+   |                                 ----------  ^^^^^^^^^^ re-bound here
+   |                                 |
+   |                                 `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:135:45
+   |
+LL | trait TRW2<T> where T: Iterator<Item: Copy, Item: Copy> {}
+   |                                 ----------  ^^^^^^^^^^ re-bound here
+   |                                 |
+   |                                 `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:137:48
+   |
+LL | trait TRW3<T> where T: Iterator<Item: 'static, Item: 'static> {}
+   |                                 -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                 |
+   |                                 `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:139:46
+   |
+LL | trait TRSW1 where Self: Iterator<Item: Copy, Item: Send> {}
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:139:46
+   |
+LL | trait TRSW1 where Self: Iterator<Item: Copy, Item: Send> {}
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:142:46
+   |
+LL | trait TRSW2 where Self: Iterator<Item: Copy, Item: Copy> {}
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:142:46
+   |
+LL | trait TRSW2 where Self: Iterator<Item: Copy, Item: Copy> {}
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:145:49
+   |
+LL | trait TRSW3 where Self: Iterator<Item: 'static, Item: 'static> {}
+   |                                  -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:145:49
+   |
+LL | trait TRSW3 where Self: Iterator<Item: 'static, Item: 'static> {}
+   |                                  -------------  ^^^^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:155:40
+   |
+LL | type TADyn1 = dyn Iterator<Item: Copy, Item: Send>;
+   |                            ----------  ^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:157:44
+   |
+LL | type TADyn2 = Box<dyn Iterator<Item: Copy, Item: Copy>>;
+   |                                ----------  ^^^^^^^^^^ re-bound here
+   |                                |
+   |                                `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:159:43
+   |
+LL | type TADyn3 = dyn Iterator<Item: 'static, Item: 'static>;
+   |                            -------------  ^^^^^^^^^^^^^ re-bound here
+   |                            |
+   |                            `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:148:43
+   |
+LL | trait TRA1 { type A: Iterator<Item: Copy, Item: Send>; }
+   |                               ----------  ^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:150:43
+   |
+LL | trait TRA2 { type A: Iterator<Item: Copy, Item: Copy>; }
+   |                               ----------  ^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:152:46
+   |
+LL | trait TRA3 { type A: Iterator<Item: 'static, Item: 'static>; }
+   |                               -------------  ^^^^^^^^^^^^^ re-bound here
+   |                               |
+   |                               `Item` bound here first
+
+error: aborting due to 69 previous errors; 2 warnings emitted
+
+For more information about this error, try `rustc --explain E0719`.
diff --git a/src/test/ui/associated-type-bounds/duplicate.stderr b/src/test/ui/associated-type-bounds/duplicate.min_tait.stderr
similarity index 91%
rename from src/test/ui/associated-type-bounds/duplicate.stderr
rename to src/test/ui/associated-type-bounds/duplicate.min_tait.stderr
index de2876d6b60..cc775dee4a2 100644
--- a/src/test/ui/associated-type-bounds/duplicate.stderr
+++ b/src/test/ui/associated-type-bounds/duplicate.min_tait.stderr
@@ -1,5 +1,5 @@
 warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/duplicate.rs:5:12
+  --> $DIR/duplicate.rs:8:12
    |
 LL | #![feature(impl_trait_in_bindings)]
    |            ^^^^^^^^^^^^^^^^^^^^^^
@@ -8,7 +8,7 @@ LL | #![feature(impl_trait_in_bindings)]
    = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:10:36
+  --> $DIR/duplicate.rs:13:36
    |
 LL | struct SI1<T: Iterator<Item: Copy, Item: Send>> { f: T }
    |                        ----------  ^^^^^^^^^^ re-bound here
@@ -16,7 +16,7 @@ LL | struct SI1<T: Iterator<Item: Copy, Item: Send>> { f: T }
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:12:36
+  --> $DIR/duplicate.rs:15:36
    |
 LL | struct SI2<T: Iterator<Item: Copy, Item: Copy>> { f: T }
    |                        ----------  ^^^^^^^^^^ re-bound here
@@ -24,7 +24,7 @@ LL | struct SI2<T: Iterator<Item: Copy, Item: Copy>> { f: T }
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:14:39
+  --> $DIR/duplicate.rs:17:39
    |
 LL | struct SI3<T: Iterator<Item: 'static, Item: 'static>> { f: T }
    |                        -------------  ^^^^^^^^^^^^^ re-bound here
@@ -32,7 +32,7 @@ LL | struct SI3<T: Iterator<Item: 'static, Item: 'static>> { f: T }
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:16:45
+  --> $DIR/duplicate.rs:19:45
    |
 LL | struct SW1<T> where T: Iterator<Item: Copy, Item: Send> { f: T }
    |                                 ----------  ^^^^^^^^^^ re-bound here
@@ -40,7 +40,7 @@ LL | struct SW1<T> where T: Iterator<Item: Copy, Item: Send> { f: T }
    |                                 `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:18:45
+  --> $DIR/duplicate.rs:21:45
    |
 LL | struct SW2<T> where T: Iterator<Item: Copy, Item: Copy> { f: T }
    |                                 ----------  ^^^^^^^^^^ re-bound here
@@ -48,7 +48,7 @@ LL | struct SW2<T> where T: Iterator<Item: Copy, Item: Copy> { f: T }
    |                                 `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:20:48
+  --> $DIR/duplicate.rs:23:48
    |
 LL | struct SW3<T> where T: Iterator<Item: 'static, Item: 'static> { f: T }
    |                                 -------------  ^^^^^^^^^^^^^ re-bound here
@@ -56,7 +56,7 @@ LL | struct SW3<T> where T: Iterator<Item: 'static, Item: 'static> { f: T }
    |                                 `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:23:34
+  --> $DIR/duplicate.rs:26:34
    |
 LL | enum EI1<T: Iterator<Item: Copy, Item: Send>> { V(T) }
    |                      ----------  ^^^^^^^^^^ re-bound here
@@ -64,7 +64,7 @@ LL | enum EI1<T: Iterator<Item: Copy, Item: Send>> { V(T) }
    |                      `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:25:34
+  --> $DIR/duplicate.rs:28:34
    |
 LL | enum EI2<T: Iterator<Item: Copy, Item: Copy>> { V(T) }
    |                      ----------  ^^^^^^^^^^ re-bound here
@@ -72,7 +72,7 @@ LL | enum EI2<T: Iterator<Item: Copy, Item: Copy>> { V(T) }
    |                      `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:27:37
+  --> $DIR/duplicate.rs:30:37
    |
 LL | enum EI3<T: Iterator<Item: 'static, Item: 'static>> { V(T) }
    |                      -------------  ^^^^^^^^^^^^^ re-bound here
@@ -80,7 +80,7 @@ LL | enum EI3<T: Iterator<Item: 'static, Item: 'static>> { V(T) }
    |                      `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:29:43
+  --> $DIR/duplicate.rs:32:43
    |
 LL | enum EW1<T> where T: Iterator<Item: Copy, Item: Send> { V(T) }
    |                               ----------  ^^^^^^^^^^ re-bound here
@@ -88,7 +88,7 @@ LL | enum EW1<T> where T: Iterator<Item: Copy, Item: Send> { V(T) }
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:31:43
+  --> $DIR/duplicate.rs:34:43
    |
 LL | enum EW2<T> where T: Iterator<Item: Copy, Item: Copy> { V(T) }
    |                               ----------  ^^^^^^^^^^ re-bound here
@@ -96,7 +96,7 @@ LL | enum EW2<T> where T: Iterator<Item: Copy, Item: Copy> { V(T) }
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:33:46
+  --> $DIR/duplicate.rs:36:46
    |
 LL | enum EW3<T> where T: Iterator<Item: 'static, Item: 'static> { V(T) }
    |                               -------------  ^^^^^^^^^^^^^ re-bound here
@@ -104,7 +104,7 @@ LL | enum EW3<T> where T: Iterator<Item: 'static, Item: 'static> { V(T) }
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:36:35
+  --> $DIR/duplicate.rs:39:35
    |
 LL | union UI1<T: Iterator<Item: Copy, Item: Send>> { f: T }
    |                       ----------  ^^^^^^^^^^ re-bound here
@@ -112,7 +112,7 @@ LL | union UI1<T: Iterator<Item: Copy, Item: Send>> { f: T }
    |                       `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:38:35
+  --> $DIR/duplicate.rs:41:35
    |
 LL | union UI2<T: Iterator<Item: Copy, Item: Copy>> { f: T }
    |                       ----------  ^^^^^^^^^^ re-bound here
@@ -120,7 +120,7 @@ LL | union UI2<T: Iterator<Item: Copy, Item: Copy>> { f: T }
    |                       `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:40:38
+  --> $DIR/duplicate.rs:43:38
    |
 LL | union UI3<T: Iterator<Item: 'static, Item: 'static>> { f: T }
    |                       -------------  ^^^^^^^^^^^^^ re-bound here
@@ -128,7 +128,7 @@ LL | union UI3<T: Iterator<Item: 'static, Item: 'static>> { f: T }
    |                       `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:42:44
+  --> $DIR/duplicate.rs:45:44
    |
 LL | union UW1<T> where T: Iterator<Item: Copy, Item: Send> { f: T }
    |                                ----------  ^^^^^^^^^^ re-bound here
@@ -136,7 +136,7 @@ LL | union UW1<T> where T: Iterator<Item: Copy, Item: Send> { f: T }
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:44:44
+  --> $DIR/duplicate.rs:47:44
    |
 LL | union UW2<T> where T: Iterator<Item: Copy, Item: Copy> { f: T }
    |                                ----------  ^^^^^^^^^^ re-bound here
@@ -144,7 +144,7 @@ LL | union UW2<T> where T: Iterator<Item: Copy, Item: Copy> { f: T }
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:46:47
+  --> $DIR/duplicate.rs:49:47
    |
 LL | union UW3<T> where T: Iterator<Item: 'static, Item: 'static> { f: T }
    |                                -------------  ^^^^^^^^^^^^^ re-bound here
@@ -152,7 +152,7 @@ LL | union UW3<T> where T: Iterator<Item: 'static, Item: 'static> { f: T }
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:49:32
+  --> $DIR/duplicate.rs:52:32
    |
 LL | fn FI1<T: Iterator<Item: Copy, Item: Send>>() {}
    |                    ----------  ^^^^^^^^^^ re-bound here
@@ -160,7 +160,7 @@ LL | fn FI1<T: Iterator<Item: Copy, Item: Send>>() {}
    |                    `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:51:32
+  --> $DIR/duplicate.rs:54:32
    |
 LL | fn FI2<T: Iterator<Item: Copy, Item: Copy>>() {}
    |                    ----------  ^^^^^^^^^^ re-bound here
@@ -168,7 +168,7 @@ LL | fn FI2<T: Iterator<Item: Copy, Item: Copy>>() {}
    |                    `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:53:35
+  --> $DIR/duplicate.rs:56:35
    |
 LL | fn FI3<T: Iterator<Item: 'static, Item: 'static>>() {}
    |                    -------------  ^^^^^^^^^^^^^ re-bound here
@@ -176,7 +176,7 @@ LL | fn FI3<T: Iterator<Item: 'static, Item: 'static>>() {}
    |                    `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:55:43
+  --> $DIR/duplicate.rs:58:43
    |
 LL | fn FW1<T>() where T: Iterator<Item: Copy, Item: Send> {}
    |                               ----------  ^^^^^^^^^^ re-bound here
@@ -184,7 +184,7 @@ LL | fn FW1<T>() where T: Iterator<Item: Copy, Item: Send> {}
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:57:43
+  --> $DIR/duplicate.rs:60:43
    |
 LL | fn FW2<T>() where T: Iterator<Item: Copy, Item: Copy> {}
    |                               ----------  ^^^^^^^^^^ re-bound here
@@ -192,7 +192,7 @@ LL | fn FW2<T>() where T: Iterator<Item: Copy, Item: Copy> {}
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:59:46
+  --> $DIR/duplicate.rs:62:46
    |
 LL | fn FW3<T>() where T: Iterator<Item: 'static, Item: 'static> {}
    |                               -------------  ^^^^^^^^^^^^^ re-bound here
@@ -200,7 +200,7 @@ LL | fn FW3<T>() where T: Iterator<Item: 'static, Item: 'static> {}
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:65:40
+  --> $DIR/duplicate.rs:68:40
    |
 LL | fn FAPIT1(_: impl Iterator<Item: Copy, Item: Send>) {}
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -208,7 +208,7 @@ LL | fn FAPIT1(_: impl Iterator<Item: Copy, Item: Send>) {}
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:67:40
+  --> $DIR/duplicate.rs:70:40
    |
 LL | fn FAPIT2(_: impl Iterator<Item: Copy, Item: Copy>) {}
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -216,7 +216,7 @@ LL | fn FAPIT2(_: impl Iterator<Item: Copy, Item: Copy>) {}
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:69:43
+  --> $DIR/duplicate.rs:72:43
    |
 LL | fn FAPIT3(_: impl Iterator<Item: 'static, Item: 'static>) {}
    |                            -------------  ^^^^^^^^^^^^^ re-bound here
@@ -224,7 +224,7 @@ LL | fn FAPIT3(_: impl Iterator<Item: 'static, Item: 'static>) {}
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:72:39
+  --> $DIR/duplicate.rs:75:39
    |
 LL | const CIT1: impl Iterator<Item: Copy, Item: Send> = iter::empty();
    |                           ----------  ^^^^^^^^^^ re-bound here
@@ -232,7 +232,7 @@ LL | const CIT1: impl Iterator<Item: Copy, Item: Send> = iter::empty();
    |                           `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:74:39
+  --> $DIR/duplicate.rs:77:39
    |
 LL | const CIT2: impl Iterator<Item: Copy, Item: Copy> = iter::empty();
    |                           ----------  ^^^^^^^^^^ re-bound here
@@ -240,7 +240,7 @@ LL | const CIT2: impl Iterator<Item: Copy, Item: Copy> = iter::empty();
    |                           `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:76:42
+  --> $DIR/duplicate.rs:79:42
    |
 LL | const CIT3: impl Iterator<Item: 'static, Item: 'static> = iter::empty();
    |                           -------------  ^^^^^^^^^^^^^ re-bound here
@@ -248,7 +248,7 @@ LL | const CIT3: impl Iterator<Item: 'static, Item: 'static> = iter::empty();
    |                           `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:78:40
+  --> $DIR/duplicate.rs:81:40
    |
 LL | static SIT1: impl Iterator<Item: Copy, Item: Send> = iter::empty();
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -256,7 +256,7 @@ LL | static SIT1: impl Iterator<Item: Copy, Item: Send> = iter::empty();
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:80:40
+  --> $DIR/duplicate.rs:83:40
    |
 LL | static SIT2: impl Iterator<Item: Copy, Item: Copy> = iter::empty();
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -264,7 +264,7 @@ LL | static SIT2: impl Iterator<Item: Copy, Item: Copy> = iter::empty();
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:82:43
+  --> $DIR/duplicate.rs:85:43
    |
 LL | static SIT3: impl Iterator<Item: 'static, Item: 'static> = iter::empty();
    |                            -------------  ^^^^^^^^^^^^^ re-bound here
@@ -272,7 +272,7 @@ LL | static SIT3: impl Iterator<Item: 'static, Item: 'static> = iter::empty();
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:85:46
+  --> $DIR/duplicate.rs:88:46
    |
 LL | fn lit1() { let _: impl Iterator<Item: Copy, Item: Send> = iter::empty(); }
    |                                  ----------  ^^^^^^^^^^ re-bound here
@@ -280,7 +280,7 @@ LL | fn lit1() { let _: impl Iterator<Item: Copy, Item: Send> = iter::empty(); }
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:87:46
+  --> $DIR/duplicate.rs:90:46
    |
 LL | fn lit2() { let _: impl Iterator<Item: Copy, Item: Copy> = iter::empty(); }
    |                                  ----------  ^^^^^^^^^^ re-bound here
@@ -288,7 +288,7 @@ LL | fn lit2() { let _: impl Iterator<Item: Copy, Item: Copy> = iter::empty(); }
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:89:49
+  --> $DIR/duplicate.rs:92:49
    |
 LL | fn lit3() { let _: impl Iterator<Item: 'static, Item: 'static> = iter::empty(); }
    |                                  -------------  ^^^^^^^^^^^^^ re-bound here
@@ -296,7 +296,7 @@ LL | fn lit3() { let _: impl Iterator<Item: 'static, Item: 'static> = iter::empt
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:92:35
+  --> $DIR/duplicate.rs:95:35
    |
 LL | type TAI1<T: Iterator<Item: Copy, Item: Send>> = T;
    |                       ----------  ^^^^^^^^^^ re-bound here
@@ -304,7 +304,7 @@ LL | type TAI1<T: Iterator<Item: Copy, Item: Send>> = T;
    |                       `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:94:35
+  --> $DIR/duplicate.rs:97:35
    |
 LL | type TAI2<T: Iterator<Item: Copy, Item: Copy>> = T;
    |                       ----------  ^^^^^^^^^^ re-bound here
@@ -312,7 +312,7 @@ LL | type TAI2<T: Iterator<Item: Copy, Item: Copy>> = T;
    |                       `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:96:38
+  --> $DIR/duplicate.rs:99:38
    |
 LL | type TAI3<T: Iterator<Item: 'static, Item: 'static>> = T;
    |                       -------------  ^^^^^^^^^^^^^ re-bound here
@@ -320,7 +320,7 @@ LL | type TAI3<T: Iterator<Item: 'static, Item: 'static>> = T;
    |                       `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:98:44
+  --> $DIR/duplicate.rs:101:44
    |
 LL | type TAW1<T> where T: Iterator<Item: Copy, Item: Send> = T;
    |                                ----------  ^^^^^^^^^^ re-bound here
@@ -328,7 +328,7 @@ LL | type TAW1<T> where T: Iterator<Item: Copy, Item: Send> = T;
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:100:44
+  --> $DIR/duplicate.rs:103:44
    |
 LL | type TAW2<T> where T: Iterator<Item: Copy, Item: Copy> = T;
    |                                ----------  ^^^^^^^^^^ re-bound here
@@ -336,7 +336,7 @@ LL | type TAW2<T> where T: Iterator<Item: Copy, Item: Copy> = T;
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:102:47
+  --> $DIR/duplicate.rs:105:47
    |
 LL | type TAW3<T> where T: Iterator<Item: 'static, Item: 'static> = T;
    |                                -------------  ^^^^^^^^^^^^^ re-bound here
@@ -344,7 +344,7 @@ LL | type TAW3<T> where T: Iterator<Item: 'static, Item: 'static> = T;
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:105:36
+  --> $DIR/duplicate.rs:108:36
    |
 LL | type ETAI1<T: Iterator<Item: Copy, Item: Send>> = impl Copy;
    |                        ----------  ^^^^^^^^^^ re-bound here
@@ -352,7 +352,7 @@ LL | type ETAI1<T: Iterator<Item: Copy, Item: Send>> = impl Copy;
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:107:36
+  --> $DIR/duplicate.rs:110:36
    |
 LL | type ETAI2<T: Iterator<Item: Copy, Item: Copy>> = impl Copy;
    |                        ----------  ^^^^^^^^^^ re-bound here
@@ -360,7 +360,7 @@ LL | type ETAI2<T: Iterator<Item: Copy, Item: Copy>> = impl Copy;
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:109:39
+  --> $DIR/duplicate.rs:112:39
    |
 LL | type ETAI3<T: Iterator<Item: 'static, Item: 'static>> = impl Copy;
    |                        -------------  ^^^^^^^^^^^^^ re-bound here
@@ -368,7 +368,7 @@ LL | type ETAI3<T: Iterator<Item: 'static, Item: 'static>> = impl Copy;
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:111:40
+  --> $DIR/duplicate.rs:114:40
    |
 LL | type ETAI4 = impl Iterator<Item: Copy, Item: Send>;
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -376,7 +376,7 @@ LL | type ETAI4 = impl Iterator<Item: Copy, Item: Send>;
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:113:40
+  --> $DIR/duplicate.rs:116:40
    |
 LL | type ETAI5 = impl Iterator<Item: Copy, Item: Copy>;
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -384,7 +384,7 @@ LL | type ETAI5 = impl Iterator<Item: Copy, Item: Copy>;
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:115:43
+  --> $DIR/duplicate.rs:118:43
    |
 LL | type ETAI6 = impl Iterator<Item: 'static, Item: 'static>;
    |                            -------------  ^^^^^^^^^^^^^ re-bound here
@@ -392,7 +392,7 @@ LL | type ETAI6 = impl Iterator<Item: 'static, Item: 'static>;
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:118:36
+  --> $DIR/duplicate.rs:121:36
    |
 LL | trait TRI1<T: Iterator<Item: Copy, Item: Send>> {}
    |                        ----------  ^^^^^^^^^^ re-bound here
@@ -400,7 +400,7 @@ LL | trait TRI1<T: Iterator<Item: Copy, Item: Send>> {}
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:120:36
+  --> $DIR/duplicate.rs:123:36
    |
 LL | trait TRI2<T: Iterator<Item: Copy, Item: Copy>> {}
    |                        ----------  ^^^^^^^^^^ re-bound here
@@ -408,7 +408,7 @@ LL | trait TRI2<T: Iterator<Item: Copy, Item: Copy>> {}
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:122:39
+  --> $DIR/duplicate.rs:125:39
    |
 LL | trait TRI3<T: Iterator<Item: 'static, Item: 'static>> {}
    |                        -------------  ^^^^^^^^^^^^^ re-bound here
@@ -416,7 +416,7 @@ LL | trait TRI3<T: Iterator<Item: 'static, Item: 'static>> {}
    |                        `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:124:34
+  --> $DIR/duplicate.rs:127:34
    |
 LL | trait TRS1: Iterator<Item: Copy, Item: Send> {}
    |                      ----------  ^^^^^^^^^^ re-bound here
@@ -424,7 +424,7 @@ LL | trait TRS1: Iterator<Item: Copy, Item: Send> {}
    |                      `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:126:34
+  --> $DIR/duplicate.rs:129:34
    |
 LL | trait TRS2: Iterator<Item: Copy, Item: Copy> {}
    |                      ----------  ^^^^^^^^^^ re-bound here
@@ -432,7 +432,7 @@ LL | trait TRS2: Iterator<Item: Copy, Item: Copy> {}
    |                      `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:128:37
+  --> $DIR/duplicate.rs:131:37
    |
 LL | trait TRS3: Iterator<Item: 'static, Item: 'static> {}
    |                      -------------  ^^^^^^^^^^^^^ re-bound here
@@ -440,7 +440,7 @@ LL | trait TRS3: Iterator<Item: 'static, Item: 'static> {}
    |                      `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:130:45
+  --> $DIR/duplicate.rs:133:45
    |
 LL | trait TRW1<T> where T: Iterator<Item: Copy, Item: Send> {}
    |                                 ----------  ^^^^^^^^^^ re-bound here
@@ -448,7 +448,7 @@ LL | trait TRW1<T> where T: Iterator<Item: Copy, Item: Send> {}
    |                                 `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:132:45
+  --> $DIR/duplicate.rs:135:45
    |
 LL | trait TRW2<T> where T: Iterator<Item: Copy, Item: Copy> {}
    |                                 ----------  ^^^^^^^^^^ re-bound here
@@ -456,7 +456,7 @@ LL | trait TRW2<T> where T: Iterator<Item: Copy, Item: Copy> {}
    |                                 `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:134:48
+  --> $DIR/duplicate.rs:137:48
    |
 LL | trait TRW3<T> where T: Iterator<Item: 'static, Item: 'static> {}
    |                                 -------------  ^^^^^^^^^^^^^ re-bound here
@@ -464,15 +464,7 @@ LL | trait TRW3<T> where T: Iterator<Item: 'static, Item: 'static> {}
    |                                 `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:136:46
-   |
-LL | trait TRSW1 where Self: Iterator<Item: Copy, Item: Send> {}
-   |                                  ----------  ^^^^^^^^^^ re-bound here
-   |                                  |
-   |                                  `Item` bound here first
-
-error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:136:46
+  --> $DIR/duplicate.rs:139:46
    |
 LL | trait TRSW1 where Self: Iterator<Item: Copy, Item: Send> {}
    |                                  ----------  ^^^^^^^^^^ re-bound here
@@ -482,13 +474,13 @@ LL | trait TRSW1 where Self: Iterator<Item: Copy, Item: Send> {}
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
   --> $DIR/duplicate.rs:139:46
    |
-LL | trait TRSW2 where Self: Iterator<Item: Copy, Item: Copy> {}
+LL | trait TRSW1 where Self: Iterator<Item: Copy, Item: Send> {}
    |                                  ----------  ^^^^^^^^^^ re-bound here
    |                                  |
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:139:46
+  --> $DIR/duplicate.rs:142:46
    |
 LL | trait TRSW2 where Self: Iterator<Item: Copy, Item: Copy> {}
    |                                  ----------  ^^^^^^^^^^ re-bound here
@@ -496,7 +488,15 @@ LL | trait TRSW2 where Self: Iterator<Item: Copy, Item: Copy> {}
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:142:49
+  --> $DIR/duplicate.rs:142:46
+   |
+LL | trait TRSW2 where Self: Iterator<Item: Copy, Item: Copy> {}
+   |                                  ----------  ^^^^^^^^^^ re-bound here
+   |                                  |
+   |                                  `Item` bound here first
+
+error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
+  --> $DIR/duplicate.rs:145:49
    |
 LL | trait TRSW3 where Self: Iterator<Item: 'static, Item: 'static> {}
    |                                  -------------  ^^^^^^^^^^^^^ re-bound here
@@ -504,7 +504,7 @@ LL | trait TRSW3 where Self: Iterator<Item: 'static, Item: 'static> {}
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:142:49
+  --> $DIR/duplicate.rs:145:49
    |
 LL | trait TRSW3 where Self: Iterator<Item: 'static, Item: 'static> {}
    |                                  -------------  ^^^^^^^^^^^^^ re-bound here
@@ -512,7 +512,7 @@ LL | trait TRSW3 where Self: Iterator<Item: 'static, Item: 'static> {}
    |                                  `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:152:40
+  --> $DIR/duplicate.rs:155:40
    |
 LL | type TADyn1 = dyn Iterator<Item: Copy, Item: Send>;
    |                            ----------  ^^^^^^^^^^ re-bound here
@@ -520,7 +520,7 @@ LL | type TADyn1 = dyn Iterator<Item: Copy, Item: Send>;
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:154:44
+  --> $DIR/duplicate.rs:157:44
    |
 LL | type TADyn2 = Box<dyn Iterator<Item: Copy, Item: Copy>>;
    |                                ----------  ^^^^^^^^^^ re-bound here
@@ -528,7 +528,7 @@ LL | type TADyn2 = Box<dyn Iterator<Item: Copy, Item: Copy>>;
    |                                `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:156:43
+  --> $DIR/duplicate.rs:159:43
    |
 LL | type TADyn3 = dyn Iterator<Item: 'static, Item: 'static>;
    |                            -------------  ^^^^^^^^^^^^^ re-bound here
@@ -536,7 +536,7 @@ LL | type TADyn3 = dyn Iterator<Item: 'static, Item: 'static>;
    |                            `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:145:43
+  --> $DIR/duplicate.rs:148:43
    |
 LL | trait TRA1 { type A: Iterator<Item: Copy, Item: Send>; }
    |                               ----------  ^^^^^^^^^^ re-bound here
@@ -544,7 +544,7 @@ LL | trait TRA1 { type A: Iterator<Item: Copy, Item: Send>; }
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:147:43
+  --> $DIR/duplicate.rs:150:43
    |
 LL | trait TRA2 { type A: Iterator<Item: Copy, Item: Copy>; }
    |                               ----------  ^^^^^^^^^^ re-bound here
@@ -552,7 +552,7 @@ LL | trait TRA2 { type A: Iterator<Item: Copy, Item: Copy>; }
    |                               `Item` bound here first
 
 error[E0719]: the value of the associated type `Item` (from trait `Iterator`) is already specified
-  --> $DIR/duplicate.rs:149:46
+  --> $DIR/duplicate.rs:152:46
    |
 LL | trait TRA3 { type A: Iterator<Item: 'static, Item: 'static>; }
    |                               -------------  ^^^^^^^^^^^^^ re-bound here
diff --git a/src/test/ui/associated-type-bounds/duplicate.rs b/src/test/ui/associated-type-bounds/duplicate.rs
index 39df9ba02fd..a7bbeaf38e7 100644
--- a/src/test/ui/associated-type-bounds/duplicate.rs
+++ b/src/test/ui/associated-type-bounds/duplicate.rs
@@ -1,7 +1,10 @@
 // ignore-tidy-linelength
 
 #![feature(associated_type_bounds)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![feature(impl_trait_in_bindings)] //~ WARN the feature `impl_trait_in_bindings` is incomplete
 #![feature(untagged_unions)]
 
diff --git a/src/test/ui/associated-type-bounds/trait-alias-impl-trait.full_tait.stderr b/src/test/ui/associated-type-bounds/trait-alias-impl-trait.full_tait.stderr
new file mode 100644
index 00000000000..d4da4babf4e
--- /dev/null
+++ b/src/test/ui/associated-type-bounds/trait-alias-impl-trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/trait-alias-impl-trait.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/associated-type-bounds/trait-alias-impl-trait.rs b/src/test/ui/associated-type-bounds/trait-alias-impl-trait.rs
index 025540ce200..cf20631af5b 100644
--- a/src/test/ui/associated-type-bounds/trait-alias-impl-trait.rs
+++ b/src/test/ui/associated-type-bounds/trait-alias-impl-trait.rs
@@ -1,7 +1,10 @@
 // run-pass
 
 #![feature(associated_type_bounds)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::ops::Add;
 
diff --git a/src/test/ui/associated-types/issue-63591.full_tait.stderr b/src/test/ui/associated-types/issue-63591.full_tait.stderr
new file mode 100644
index 00000000000..9857f7e2677
--- /dev/null
+++ b/src/test/ui/associated-types/issue-63591.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-63591.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/associated-types/issue-63591.rs b/src/test/ui/associated-types/issue-63591.rs
index 4d2e39f4da6..bba9ae2d9e7 100644
--- a/src/test/ui/associated-types/issue-63591.rs
+++ b/src/test/ui/associated-types/issue-63591.rs
@@ -1,7 +1,10 @@
 // check-pass
 
 #![feature(associated_type_bounds)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/async-await/issues/issue-60655-latebound-regions.full_tait.stderr b/src/test/ui/async-await/issues/issue-60655-latebound-regions.full_tait.stderr
new file mode 100644
index 00000000000..cc61becd71b
--- /dev/null
+++ b/src/test/ui/async-await/issues/issue-60655-latebound-regions.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-60655-latebound-regions.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/async-await/issues/issue-60655-latebound-regions.rs b/src/test/ui/async-await/issues/issue-60655-latebound-regions.rs
index 66a3b07c3bd..f8b6a438961 100644
--- a/src/test/ui/async-await/issues/issue-60655-latebound-regions.rs
+++ b/src/test/ui/async-await/issues/issue-60655-latebound-regions.rs
@@ -3,7 +3,10 @@
 // check-pass
 // edition:2018
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::future::Future;
 
diff --git a/src/test/ui/feature-gates/feature-gate-min_type_alias_impl_trait.rs b/src/test/ui/feature-gates/feature-gate-min_type_alias_impl_trait.rs
new file mode 100644
index 00000000000..ffe297a5a6a
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-min_type_alias_impl_trait.rs
@@ -0,0 +1,50 @@
+// ignore-compare-mode-chalk
+use std::fmt::Debug;
+
+type Foo = impl Debug; //~ ERROR `impl Trait` in type aliases is unstable
+
+trait Bar {
+    type Baa: Debug;
+    fn define() -> Self::Baa;
+}
+
+impl Bar for () {
+    type Baa = impl Debug; //~ ERROR `impl Trait` in type aliases is unstable
+    fn define() -> Self::Baa {
+        0
+    }
+}
+
+fn define() -> Foo {
+    0
+}
+
+trait TraitWithDefault {
+    type Assoc = impl Debug;
+    //~^ ERROR associated type defaults are unstable
+    //~| ERROR `impl Trait` not allowed outside of function
+    //~| ERROR `impl Trait` in type aliases is unstable
+}
+
+type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
+//~^ ERROR `impl Trait` in type aliases is unstable
+//~| ERROR `impl Trait` in type aliases is unstable
+//~| ERROR `impl Trait` in type aliases is unstable
+//~| ERROR `impl Trait` in type aliases is unstable
+
+fn define_multiple() -> NestedFree {
+    (vec![true], 0u8, 0i32..1)
+}
+
+impl Bar for u8 {
+    type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
+    //~^ ERROR `impl Trait` in type aliases is unstable
+    //~| ERROR `impl Trait` in type aliases is unstable
+    //~| ERROR `impl Trait` in type aliases is unstable
+    //~| ERROR `impl Trait` in type aliases is unstable
+    fn define() -> Self::Baa {
+        (vec![true], 0u8, 0i32..1)
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-min_type_alias_impl_trait.stderr b/src/test/ui/feature-gates/feature-gate-min_type_alias_impl_trait.stderr
new file mode 100644
index 00000000000..b82867c6702
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-min_type_alias_impl_trait.stderr
@@ -0,0 +1,118 @@
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:4:12
+   |
+LL | type Foo = impl Debug;
+   |            ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:12:16
+   |
+LL |     type Baa = impl Debug;
+   |                ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: associated type defaults are unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:23:5
+   |
+LL |     type Assoc = impl Debug;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #29661 <https://github.com/rust-lang/rust/issues/29661> for more information
+   = help: add `#![feature(associated_type_defaults)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:23:18
+   |
+LL |     type Assoc = impl Debug;
+   |                  ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:29:24
+   |
+LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
+   |                        ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:29:37
+   |
+LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
+   |                                     ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:29:49
+   |
+LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
+   |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:29:70
+   |
+LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
+   |                                                                      ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:40:21
+   |
+LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
+   |                     ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:40:34
+   |
+LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
+   |                                  ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:40:46
+   |
+LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
+   |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0658]: `impl Trait` in type aliases is unstable
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:40:67
+   |
+LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
+   |                                                                   ^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
+
+error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
+  --> $DIR/feature-gate-min_type_alias_impl_trait.rs:23:18
+   |
+LL |     type Assoc = impl Debug;
+   |                  ^^^^^^^^^^
+
+error: aborting due to 13 previous errors
+
+Some errors have detailed explanations: E0562, E0658.
+For more information about an error, try `rustc --explain E0562`.
diff --git a/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.rs b/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.rs
index ffe297a5a6a..3b31bc159c0 100644
--- a/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.rs
+++ b/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.rs
@@ -1,50 +1,37 @@
 // ignore-compare-mode-chalk
+#![feature(min_type_alias_impl_trait)]
 use std::fmt::Debug;
 
-type Foo = impl Debug; //~ ERROR `impl Trait` in type aliases is unstable
+type Foo = impl Debug;
+//~^ ERROR could not find defining uses
 
-trait Bar {
-    type Baa: Debug;
-    fn define() -> Self::Baa;
+struct Bar(Foo);
+fn define() -> Bar {
+    Bar(42) //~ ERROR mismatched types
 }
 
-impl Bar for () {
-    type Baa = impl Debug; //~ ERROR `impl Trait` in type aliases is unstable
-    fn define() -> Self::Baa {
-        0
-    }
+type Foo2 = impl Debug;
+
+fn define2() {
+    let x = || -> Foo2 { 42 };
 }
 
-fn define() -> Foo {
-    0
+type Foo3 = impl Debug;
+//~^ ERROR could not find defining uses
+
+fn define3(x: Foo3) {
+    let y: i32 = x; //~ ERROR mismatched types
+}
+fn define3_1() {
+    define3(42) //~ ERROR mismatched types
 }
 
-trait TraitWithDefault {
-    type Assoc = impl Debug;
-    //~^ ERROR associated type defaults are unstable
-    //~| ERROR `impl Trait` not allowed outside of function
-    //~| ERROR `impl Trait` in type aliases is unstable
-}
+type Foo4 = impl Debug;
+//~^ ERROR could not find defining uses
 
-type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
-//~^ ERROR `impl Trait` in type aliases is unstable
-//~| ERROR `impl Trait` in type aliases is unstable
-//~| ERROR `impl Trait` in type aliases is unstable
-//~| ERROR `impl Trait` in type aliases is unstable
-
-fn define_multiple() -> NestedFree {
-    (vec![true], 0u8, 0i32..1)
-}
-
-impl Bar for u8 {
-    type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
-    //~^ ERROR `impl Trait` in type aliases is unstable
-    //~| ERROR `impl Trait` in type aliases is unstable
-    //~| ERROR `impl Trait` in type aliases is unstable
-    //~| ERROR `impl Trait` in type aliases is unstable
-    fn define() -> Self::Baa {
-        (vec![true], 0u8, 0i32..1)
-    }
+fn define4() {
+    let y: Foo4 = 42;
+    //~^ ERROR mismatched types
 }
 
 fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.stderr b/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.stderr
index b32cf949854..da3ddb1c509 100644
--- a/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.stderr
+++ b/src/test/ui/feature-gates/feature-gate-type_alias_impl_trait.stderr
@@ -1,118 +1,73 @@
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:4:12
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:10:9
+   |
+LL | type Foo = impl Debug;
+   |            ---------- the expected opaque type
+...
+LL |     Bar(42)
+   |         ^^ expected opaque type, found integer
+   |
+   = note: expected opaque type `impl Debug`
+                     found type `{integer}`
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:23:18
+   |
+LL | type Foo3 = impl Debug;
+   |             ---------- the found opaque type
+...
+LL |     let y: i32 = x;
+   |            ---   ^ expected `i32`, found opaque type
+   |            |
+   |            expected due to this
+   |
+   = note:     expected type `i32`
+           found opaque type `impl Debug`
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:26:13
+   |
+LL | type Foo3 = impl Debug;
+   |             ---------- the expected opaque type
+...
+LL |     define3(42)
+   |             ^^ expected opaque type, found integer
+   |
+   = note: expected opaque type `impl Debug`
+                     found type `{integer}`
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:33:19
+   |
+LL | type Foo4 = impl Debug;
+   |             ---------- the expected opaque type
+...
+LL |     let y: Foo4 = 42;
+   |            ----   ^^ expected opaque type, found integer
+   |            |
+   |            expected due to this
+   |
+   = note: expected opaque type `impl Debug`
+                     found type `{integer}`
+
+error: could not find defining uses
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:5:12
    |
 LL | type Foo = impl Debug;
    |            ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
 
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:12:16
+error: could not find defining uses
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:19:13
    |
-LL |     type Baa = impl Debug;
-   |                ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+LL | type Foo3 = impl Debug;
+   |             ^^^^^^^^^^
 
-error[E0658]: associated type defaults are unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:23:5
+error: could not find defining uses
+  --> $DIR/feature-gate-type_alias_impl_trait.rs:29:13
    |
-LL |     type Assoc = impl Debug;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #29661 <https://github.com/rust-lang/rust/issues/29661> for more information
-   = help: add `#![feature(associated_type_defaults)]` to the crate attributes to enable
+LL | type Foo4 = impl Debug;
+   |             ^^^^^^^^^^
 
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:23:18
-   |
-LL |     type Assoc = impl Debug;
-   |                  ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+error: aborting due to 7 previous errors
 
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:29:24
-   |
-LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
-   |                        ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:29:37
-   |
-LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
-   |                                     ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:29:49
-   |
-LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
-   |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:29:70
-   |
-LL | type NestedFree = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug>);
-   |                                                                      ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:40:21
-   |
-LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
-   |                     ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:40:34
-   |
-LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
-   |                                  ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:40:46
-   |
-LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
-   |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:40:67
-   |
-LL |     type Baa = (Vec<impl Debug>, impl Debug, impl Iterator<Item = impl Debug> + Debug);
-   |                                                                   ^^^^^^^^^^
-   |
-   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
-
-error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
-  --> $DIR/feature-gate-type_alias_impl_trait.rs:23:18
-   |
-LL |     type Assoc = impl Debug;
-   |                  ^^^^^^^^^^
-
-error: aborting due to 13 previous errors
-
-Some errors have detailed explanations: E0562, E0658.
-For more information about an error, try `rustc --explain E0562`.
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/generator/layout-error.full_tait.stderr b/src/test/ui/generator/layout-error.full_tait.stderr
new file mode 100644
index 00000000000..805a4d1d000
--- /dev/null
+++ b/src/test/ui/generator/layout-error.full_tait.stderr
@@ -0,0 +1,26 @@
+error[E0425]: cannot find value `Foo` in this scope
+  --> $DIR/layout-error.rs:25:17
+   |
+LL |         let a = Foo;
+   |                 ^^^ not found in this scope
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/layout-error.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/layout-error.rs:8:56
+   |
+LL | #![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+   |                                                        ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: aborting due to previous error; 2 warnings emitted
+
+For more information about this error, try `rustc --explain E0425`.
diff --git a/src/test/ui/generator/layout-error.stderr b/src/test/ui/generator/layout-error.min_tait.stderr
similarity index 87%
rename from src/test/ui/generator/layout-error.stderr
rename to src/test/ui/generator/layout-error.min_tait.stderr
index b1a258f4f2c..1be39856883 100644
--- a/src/test/ui/generator/layout-error.stderr
+++ b/src/test/ui/generator/layout-error.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0425]: cannot find value `Foo` in this scope
-  --> $DIR/layout-error.rs:21:17
+  --> $DIR/layout-error.rs:25:17
    |
 LL |         let a = Foo;
    |                 ^^^ not found in this scope
diff --git a/src/test/ui/generator/layout-error.rs b/src/test/ui/generator/layout-error.rs
index 059867277ad..549c6f6ebe7 100644
--- a/src/test/ui/generator/layout-error.rs
+++ b/src/test/ui/generator/layout-error.rs
@@ -3,7 +3,11 @@
 //
 // edition:2018
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 use std::future::Future;
 
 pub struct Task<F: Future>(F);
diff --git a/src/test/ui/generator/metadata-sufficient-for-layout.full_tait.stderr b/src/test/ui/generator/metadata-sufficient-for-layout.full_tait.stderr
new file mode 100644
index 00000000000..59cd8e04513
--- /dev/null
+++ b/src/test/ui/generator/metadata-sufficient-for-layout.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/metadata-sufficient-for-layout.rs:11:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/metadata-sufficient-for-layout.rs:11:55
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/generator/metadata-sufficient-for-layout.rs b/src/test/ui/generator/metadata-sufficient-for-layout.rs
index 9c82359a0be..7d474c82eef 100644
--- a/src/test/ui/generator/metadata-sufficient-for-layout.rs
+++ b/src/test/ui/generator/metadata-sufficient-for-layout.rs
@@ -6,7 +6,11 @@
 // aux-build:metadata-sufficient-for-layout.rs
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 #![feature(generator_trait)]
 
 extern crate metadata_sufficient_for_layout;
diff --git a/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.full_tait.stderr b/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.full_tait.stderr
new file mode 100644
index 00000000000..174c4c62da9
--- /dev/null
+++ b/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/associated-impl-trait-type-generic-trait.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.rs b/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.rs
index 6c7c46b0e3d..b2dad596ffa 100644
--- a/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.rs
+++ b/src/test/ui/impl-trait/associated-impl-trait-type-generic-trait.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // build-pass (FIXME(62277): could be check-pass?)
 
 trait Bar {}
diff --git a/src/test/ui/impl-trait/associated-impl-trait-type-trivial.full_tait.stderr b/src/test/ui/impl-trait/associated-impl-trait-type-trivial.full_tait.stderr
new file mode 100644
index 00000000000..e3dd4a60b4d
--- /dev/null
+++ b/src/test/ui/impl-trait/associated-impl-trait-type-trivial.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/associated-impl-trait-type-trivial.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/associated-impl-trait-type-trivial.rs b/src/test/ui/impl-trait/associated-impl-trait-type-trivial.rs
index cdda341cad8..c101ba22948 100644
--- a/src/test/ui/impl-trait/associated-impl-trait-type-trivial.rs
+++ b/src/test/ui/impl-trait/associated-impl-trait-type-trivial.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // build-pass (FIXME(62277): could be check-pass?)
 
 trait Bar {}
diff --git a/src/test/ui/impl-trait/associated-impl-trait-type.full_tait.stderr b/src/test/ui/impl-trait/associated-impl-trait-type.full_tait.stderr
new file mode 100644
index 00000000000..39147b00a34
--- /dev/null
+++ b/src/test/ui/impl-trait/associated-impl-trait-type.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/associated-impl-trait-type.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/associated-impl-trait-type.rs b/src/test/ui/impl-trait/associated-impl-trait-type.rs
index d0661d66f4b..5c28eba2261 100644
--- a/src/test/ui/impl-trait/associated-impl-trait-type.rs
+++ b/src/test/ui/impl-trait/associated-impl-trait-type.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // build-pass (FIXME(62277): could be check-pass?)
 
 trait Bar {}
diff --git a/src/test/ui/impl-trait/auto-trait.full_tait.stderr b/src/test/ui/impl-trait/auto-trait.full_tait.stderr
new file mode 100644
index 00000000000..7ac08ab4921
--- /dev/null
+++ b/src/test/ui/impl-trait/auto-trait.full_tait.stderr
@@ -0,0 +1,21 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/auto-trait.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0119]: conflicting implementations of trait `AnotherTrait` for type `D<impl OpaqueTrait>`:
+  --> $DIR/auto-trait.rs:24:1
+   |
+LL | impl<T: Send> AnotherTrait for T {}
+   | -------------------------------- first implementation here
+...
+LL | impl AnotherTrait for D<OpaqueType> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `D<impl OpaqueTrait>`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0119`.
diff --git a/src/test/ui/impl-trait/auto-trait.stderr b/src/test/ui/impl-trait/auto-trait.min_tait.stderr
similarity index 93%
rename from src/test/ui/impl-trait/auto-trait.stderr
rename to src/test/ui/impl-trait/auto-trait.min_tait.stderr
index 16fe1b56b50..a497dd67e9e 100644
--- a/src/test/ui/impl-trait/auto-trait.stderr
+++ b/src/test/ui/impl-trait/auto-trait.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0119]: conflicting implementations of trait `AnotherTrait` for type `D<impl OpaqueTrait>`:
-  --> $DIR/auto-trait.rs:21:1
+  --> $DIR/auto-trait.rs:24:1
    |
 LL | impl<T: Send> AnotherTrait for T {}
    | -------------------------------- first implementation here
diff --git a/src/test/ui/impl-trait/auto-trait.rs b/src/test/ui/impl-trait/auto-trait.rs
index cf2773f4ef5..c965a34c12b 100644
--- a/src/test/ui/impl-trait/auto-trait.rs
+++ b/src/test/ui/impl-trait/auto-trait.rs
@@ -1,6 +1,9 @@
 // Tests that type alias impls traits do not leak auto-traits for
 // the purposes of coherence checking
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait OpaqueTrait {}
 impl<T> OpaqueTrait for T {}
diff --git a/src/test/ui/impl-trait/bound-normalization-pass.rs b/src/test/ui/impl-trait/bound-normalization-pass.rs
index 3e6884ef10f..6a01753b4c2 100644
--- a/src/test/ui/impl-trait/bound-normalization-pass.rs
+++ b/src/test/ui/impl-trait/bound-normalization-pass.rs
@@ -4,7 +4,7 @@
 //[sa] compile-flags: -Z save-analysis
 //-^ To make this the regression test for #75962.
 
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 #![feature(impl_trait_in_bindings)]
 //~^ WARNING the feature `impl_trait_in_bindings` is incomplete
 
diff --git a/src/test/ui/impl-trait/issue-55872-1.full_tait.stderr b/src/test/ui/impl-trait/issue-55872-1.full_tait.stderr
new file mode 100644
index 00000000000..5195333884a
--- /dev/null
+++ b/src/test/ui/impl-trait/issue-55872-1.full_tait.stderr
@@ -0,0 +1,57 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-55872-1.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0276]: impl has stricter requirements than trait
+  --> $DIR/issue-55872-1.rs:18:5
+   |
+LL |     fn foo<T>() -> Self::E;
+   |     ----------------------- definition of `foo` from trait
+...
+LL |     fn foo<T: Default>() -> Self::E {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `T: Default`
+
+error[E0277]: the trait bound `S: Copy` is not satisfied in `(S, T)`
+  --> $DIR/issue-55872-1.rs:14:14
+   |
+LL |     type E = impl Copy;
+   |              ^^^^^^^^^ within `(S, T)`, the trait `Copy` is not implemented for `S`
+   |
+   = note: required because it appears within the type `(S, T)`
+help: consider further restricting this bound
+   |
+LL | impl<S: Default + Copy> Bar for S {
+   |                 ^^^^^^
+
+error[E0277]: the trait bound `T: Copy` is not satisfied in `(S, T)`
+  --> $DIR/issue-55872-1.rs:14:14
+   |
+LL |     type E = impl Copy;
+   |              ^^^^^^^^^ within `(S, T)`, the trait `Copy` is not implemented for `T`
+   |
+   = note: required because it appears within the type `(S, T)`
+help: consider further restricting this bound
+   |
+LL |     fn foo<T: Default + Copy>() -> Self::E {
+   |                       ^^^^^^
+
+error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+  --> $DIR/issue-55872-1.rs:18:37
+   |
+LL |       fn foo<T: Default>() -> Self::E {
+   |  _____________________________________^
+LL | |
+LL | |
+LL | |         (S::default(), T::default())
+LL | |     }
+   | |_____^
+
+error: aborting due to 4 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0276, E0277.
+For more information about an error, try `rustc --explain E0276`.
diff --git a/src/test/ui/impl-trait/issue-55872-1.stderr b/src/test/ui/impl-trait/issue-55872-1.min_tait.stderr
similarity index 91%
rename from src/test/ui/impl-trait/issue-55872-1.stderr
rename to src/test/ui/impl-trait/issue-55872-1.min_tait.stderr
index 64c536cf1fe..26fc200c2a2 100644
--- a/src/test/ui/impl-trait/issue-55872-1.stderr
+++ b/src/test/ui/impl-trait/issue-55872-1.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0276]: impl has stricter requirements than trait
-  --> $DIR/issue-55872-1.rs:15:5
+  --> $DIR/issue-55872-1.rs:18:5
    |
 LL |     fn foo<T>() -> Self::E;
    |     ----------------------- definition of `foo` from trait
@@ -8,7 +8,7 @@ LL |     fn foo<T: Default>() -> Self::E {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `T: Default`
 
 error[E0277]: the trait bound `S: Copy` is not satisfied in `(S, T)`
-  --> $DIR/issue-55872-1.rs:11:14
+  --> $DIR/issue-55872-1.rs:14:14
    |
 LL |     type E = impl Copy;
    |              ^^^^^^^^^ within `(S, T)`, the trait `Copy` is not implemented for `S`
@@ -20,7 +20,7 @@ LL | impl<S: Default + Copy> Bar for S {
    |                 ^^^^^^
 
 error[E0277]: the trait bound `T: Copy` is not satisfied in `(S, T)`
-  --> $DIR/issue-55872-1.rs:11:14
+  --> $DIR/issue-55872-1.rs:14:14
    |
 LL |     type E = impl Copy;
    |              ^^^^^^^^^ within `(S, T)`, the trait `Copy` is not implemented for `T`
@@ -32,7 +32,7 @@ LL |     fn foo<T: Default + Copy>() -> Self::E {
    |                       ^^^^^^
 
 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-  --> $DIR/issue-55872-1.rs:15:37
+  --> $DIR/issue-55872-1.rs:18:37
    |
 LL |       fn foo<T: Default>() -> Self::E {
    |  _____________________________________^
diff --git a/src/test/ui/impl-trait/issue-55872-1.rs b/src/test/ui/impl-trait/issue-55872-1.rs
index a746ed09af5..e5e437cd84b 100644
--- a/src/test/ui/impl-trait/issue-55872-1.rs
+++ b/src/test/ui/impl-trait/issue-55872-1.rs
@@ -1,5 +1,8 @@
 // ignore-tidy-linelength
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait Bar {
     type E: Copy;
diff --git a/src/test/ui/impl-trait/issue-55872-2.full_tait.stderr b/src/test/ui/impl-trait/issue-55872-2.full_tait.stderr
new file mode 100644
index 00000000000..14a5c0ba97e
--- /dev/null
+++ b/src/test/ui/impl-trait/issue-55872-2.full_tait.stderr
@@ -0,0 +1,28 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-55872-2.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0277]: the trait bound `impl Future: Copy` is not satisfied
+  --> $DIR/issue-55872-2.rs:17:14
+   |
+LL |     type E = impl std::marker::Copy;
+   |              ^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `impl Future`
+
+error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+  --> $DIR/issue-55872-2.rs:19:28
+   |
+LL |       fn foo<T>() -> Self::E {
+   |  ____________________________^
+LL | |
+LL | |         async {}
+LL | |     }
+   | |_____^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/impl-trait/issue-55872-2.stderr b/src/test/ui/impl-trait/issue-55872-2.min_tait.stderr
similarity index 89%
rename from src/test/ui/impl-trait/issue-55872-2.stderr
rename to src/test/ui/impl-trait/issue-55872-2.min_tait.stderr
index f954ce9f090..c8df502345a 100644
--- a/src/test/ui/impl-trait/issue-55872-2.stderr
+++ b/src/test/ui/impl-trait/issue-55872-2.min_tait.stderr
@@ -1,11 +1,11 @@
 error[E0277]: the trait bound `impl Future: Copy` is not satisfied
-  --> $DIR/issue-55872-2.rs:14:14
+  --> $DIR/issue-55872-2.rs:17:14
    |
 LL |     type E = impl std::marker::Copy;
    |              ^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `impl Future`
 
 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-  --> $DIR/issue-55872-2.rs:16:28
+  --> $DIR/issue-55872-2.rs:19:28
    |
 LL |       fn foo<T>() -> Self::E {
    |  ____________________________^
diff --git a/src/test/ui/impl-trait/issue-55872-2.rs b/src/test/ui/impl-trait/issue-55872-2.rs
index ee09a66ef53..9c2e9b860c4 100644
--- a/src/test/ui/impl-trait/issue-55872-2.rs
+++ b/src/test/ui/impl-trait/issue-55872-2.rs
@@ -2,7 +2,10 @@
 // ignore-tidy-linelength
 // ignore-compare-mode-chalk
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait Bar {
     type E: Copy;
@@ -14,7 +17,7 @@ impl<S> Bar for S {
     type E = impl std::marker::Copy;
     //~^ ERROR the trait bound `impl Future: Copy` is not satisfied [E0277]
     fn foo<T>() -> Self::E {
-    //~^ ERROR type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+        //~^ ERROR type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
         async {}
     }
 }
diff --git a/src/test/ui/impl-trait/issue-55872.full_tait.stderr b/src/test/ui/impl-trait/issue-55872.full_tait.stderr
new file mode 100644
index 00000000000..5a35689a737
--- /dev/null
+++ b/src/test/ui/impl-trait/issue-55872.full_tait.stderr
@@ -0,0 +1,21 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-55872.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+  --> $DIR/issue-55872.rs:17:28
+   |
+LL |       fn foo<T>() -> Self::E {
+   |  ____________________________^
+LL | |
+LL | |         || ()
+LL | |     }
+   | |_____^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/issue-55872.stderr b/src/test/ui/impl-trait/issue-55872.min_tait.stderr
similarity index 89%
rename from src/test/ui/impl-trait/issue-55872.stderr
rename to src/test/ui/impl-trait/issue-55872.min_tait.stderr
index 41d7beb22fa..9baf2834643 100644
--- a/src/test/ui/impl-trait/issue-55872.stderr
+++ b/src/test/ui/impl-trait/issue-55872.min_tait.stderr
@@ -1,5 +1,5 @@
 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-  --> $DIR/issue-55872.rs:14:28
+  --> $DIR/issue-55872.rs:17:28
    |
 LL |       fn foo<T>() -> Self::E {
    |  ____________________________^
diff --git a/src/test/ui/impl-trait/issue-55872.rs b/src/test/ui/impl-trait/issue-55872.rs
index b12bfbcda9d..9a31cf521b3 100644
--- a/src/test/ui/impl-trait/issue-55872.rs
+++ b/src/test/ui/impl-trait/issue-55872.rs
@@ -1,6 +1,9 @@
 // ignore-tidy-linelength
 // ignore-compare-mode-chalk
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait Bar {
     type E: Copy;
diff --git a/src/test/ui/impl-trait/issues/issue-53457.full_tait.stderr b/src/test/ui/impl-trait/issues/issue-53457.full_tait.stderr
new file mode 100644
index 00000000000..906578c291f
--- /dev/null
+++ b/src/test/ui/impl-trait/issues/issue-53457.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-53457.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/issues/issue-53457.rs b/src/test/ui/impl-trait/issues/issue-53457.rs
index 3f975024925..c44e7f01f25 100644
--- a/src/test/ui/impl-trait/issues/issue-53457.rs
+++ b/src/test/ui/impl-trait/issues/issue-53457.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type X = impl Clone;
 
diff --git a/src/test/ui/impl-trait/issues/issue-70877.stderr b/src/test/ui/impl-trait/issues/issue-70877.full_tait.stderr
similarity index 95%
rename from src/test/ui/impl-trait/issues/issue-70877.stderr
rename to src/test/ui/impl-trait/issues/issue-70877.full_tait.stderr
index 3ef7087b08a..bd4d4fdf2a6 100644
--- a/src/test/ui/impl-trait/issues/issue-70877.stderr
+++ b/src/test/ui/impl-trait/issues/issue-70877.full_tait.stderr
@@ -1,5 +1,5 @@
 error[E0271]: type mismatch resolving `<Bar as Iterator>::Item == Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
-  --> $DIR/issue-70877.rs:9:12
+  --> $DIR/issue-70877.rs:11:12
    |
 LL | type FooRet = impl std::fmt::Debug;
    |               -------------------- the expected opaque type
diff --git a/src/test/ui/impl-trait/issues/issue-70877.min_tait.stderr b/src/test/ui/impl-trait/issues/issue-70877.min_tait.stderr
new file mode 100644
index 00000000000..bd4d4fdf2a6
--- /dev/null
+++ b/src/test/ui/impl-trait/issues/issue-70877.min_tait.stderr
@@ -0,0 +1,15 @@
+error[E0271]: type mismatch resolving `<Bar as Iterator>::Item == Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
+  --> $DIR/issue-70877.rs:11:12
+   |
+LL | type FooRet = impl std::fmt::Debug;
+   |               -------------------- the expected opaque type
+...
+LL | type Foo = impl Iterator<Item = FooItem>;
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected opaque type, found enum `Option`
+   |
+   = note: expected struct `Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> impl Debug + 'static)>`
+              found struct `Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0271`.
diff --git a/src/test/ui/impl-trait/issues/issue-70877.rs b/src/test/ui/impl-trait/issues/issue-70877.rs
index a4a59f98fd8..7ca0f90e2dc 100644
--- a/src/test/ui/impl-trait/issues/issue-70877.rs
+++ b/src/test/ui/impl-trait/issues/issue-70877.rs
@@ -1,4 +1,6 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
 #![feature(impl_trait_in_bindings)]
 #![allow(incomplete_features)]
 
diff --git a/src/test/ui/impl-trait/issues/issue-78722.full_tait.stderr b/src/test/ui/impl-trait/issues/issue-78722.full_tait.stderr
new file mode 100644
index 00000000000..d7327aa46bc
--- /dev/null
+++ b/src/test/ui/impl-trait/issues/issue-78722.full_tait.stderr
@@ -0,0 +1,35 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-78722.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-78722.rs:7:12
+   |
+LL | #![feature(impl_trait_in_bindings)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+error: `async` blocks are not allowed in constants
+  --> $DIR/issue-78722.rs:17:20
+   |
+LL |         let f: F = async { 1 };
+   |                    ^^^^^^^^^^^
+
+error[E0493]: destructors cannot be evaluated at compile-time
+  --> $DIR/issue-78722.rs:17:13
+   |
+LL |         let f: F = async { 1 };
+   |             ^ constants cannot evaluate destructors
+...
+LL |     }],
+   |     - value is dropped here
+
+error: aborting due to 2 previous errors; 2 warnings emitted
+
+For more information about this error, try `rustc --explain E0493`.
diff --git a/src/test/ui/impl-trait/issues/issue-78722.stderr b/src/test/ui/impl-trait/issues/issue-78722.min_tait.stderr
similarity index 89%
rename from src/test/ui/impl-trait/issues/issue-78722.stderr
rename to src/test/ui/impl-trait/issues/issue-78722.min_tait.stderr
index 0e1e92b9120..01ec71e7a50 100644
--- a/src/test/ui/impl-trait/issues/issue-78722.stderr
+++ b/src/test/ui/impl-trait/issues/issue-78722.min_tait.stderr
@@ -1,5 +1,5 @@
 warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/issue-78722.rs:4:12
+  --> $DIR/issue-78722.rs:7:12
    |
 LL | #![feature(impl_trait_in_bindings)]
    |            ^^^^^^^^^^^^^^^^^^^^^^
@@ -8,13 +8,13 @@ LL | #![feature(impl_trait_in_bindings)]
    = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
 
 error: `async` blocks are not allowed in constants
-  --> $DIR/issue-78722.rs:14:20
+  --> $DIR/issue-78722.rs:17:20
    |
 LL |         let f: F = async { 1 };
    |                    ^^^^^^^^^^^
 
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/issue-78722.rs:14:13
+  --> $DIR/issue-78722.rs:17:13
    |
 LL |         let f: F = async { 1 };
    |             ^ constants cannot evaluate destructors
diff --git a/src/test/ui/impl-trait/issues/issue-78722.rs b/src/test/ui/impl-trait/issues/issue-78722.rs
index 58734d3a445..0999ec63e03 100644
--- a/src/test/ui/impl-trait/issues/issue-78722.rs
+++ b/src/test/ui/impl-trait/issues/issue-78722.rs
@@ -1,6 +1,9 @@
 // edition:2018
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![feature(impl_trait_in_bindings)]
 //~^ WARN the feature `impl_trait_in_bindings` is incomplete
 
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.full_tait.stderr b/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.full_tait.stderr
new file mode 100644
index 00000000000..b2ebc7230b9
--- /dev/null
+++ b/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/error-handling-2.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
+  --> $DIR/error-handling-2.rs:16:60
+   |
+LL | fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
+   |                                                            ^^^^^^^^^
+   |
+note: hidden type `*mut &'a i32` captures the lifetime `'a` as defined on the function body at 16:8
+  --> $DIR/error-handling-2.rs:16:8
+   |
+LL | fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
+   |        ^^
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0700`.
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.stderr b/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.min_tait.stderr
similarity index 82%
rename from src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.stderr
rename to src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.min_tait.stderr
index 59105f11805..53745c290d0 100644
--- a/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.stderr
+++ b/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.min_tait.stderr
@@ -1,11 +1,11 @@
 error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
-  --> $DIR/error-handling-2.rs:13:60
+  --> $DIR/error-handling-2.rs:16:60
    |
 LL | fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
    |                                                            ^^^^^^^^^
    |
-note: hidden type `*mut &'a i32` captures the lifetime `'a` as defined on the function body at 13:8
-  --> $DIR/error-handling-2.rs:13:8
+note: hidden type `*mut &'a i32` captures the lifetime `'a` as defined on the function body at 16:8
+  --> $DIR/error-handling-2.rs:16:8
    |
 LL | fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
    |        ^^
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.rs b/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.rs
index 96d891b2cf1..196ddf9b8e4 100644
--- a/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.rs
+++ b/src/test/ui/impl-trait/multiple-lifetimes/error-handling-2.rs
@@ -1,7 +1,10 @@
 // compile-flags:-Zborrowck=mir
 
 #![feature(member_constraints)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 #[derive(Clone)]
 struct CopyIfEq<T, U>(T, U);
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/error-handling.full_tait.stderr b/src/test/ui/impl-trait/multiple-lifetimes/error-handling.full_tait.stderr
new file mode 100644
index 00000000000..d7a9e5463b3
--- /dev/null
+++ b/src/test/ui/impl-trait/multiple-lifetimes/error-handling.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/error-handling.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: lifetime may not live long enough
+  --> $DIR/error-handling.rs:26:16
+   |
+LL | fn foo<'a, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
+   |        --  -- lifetime `'b` defined here
+   |        |
+   |        lifetime `'a` defined here
+...
+LL |         let _: &'b i32 = *u.0;
+   |                ^^^^^^^ type annotation requires that `'a` must outlive `'b`
+   |
+   = help: consider adding the following bound: `'a: 'b`
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/error-handling.stderr b/src/test/ui/impl-trait/multiple-lifetimes/error-handling.min_tait.stderr
similarity index 92%
rename from src/test/ui/impl-trait/multiple-lifetimes/error-handling.stderr
rename to src/test/ui/impl-trait/multiple-lifetimes/error-handling.min_tait.stderr
index 6ce3aaf49eb..e2d745cdec8 100644
--- a/src/test/ui/impl-trait/multiple-lifetimes/error-handling.stderr
+++ b/src/test/ui/impl-trait/multiple-lifetimes/error-handling.min_tait.stderr
@@ -1,5 +1,5 @@
 error: lifetime may not live long enough
-  --> $DIR/error-handling.rs:23:16
+  --> $DIR/error-handling.rs:26:16
    |
 LL | fn foo<'a, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
    |        --  -- lifetime `'b` defined here
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/error-handling.rs b/src/test/ui/impl-trait/multiple-lifetimes/error-handling.rs
index 8d02d635094..b5adabb7abd 100644
--- a/src/test/ui/impl-trait/multiple-lifetimes/error-handling.rs
+++ b/src/test/ui/impl-trait/multiple-lifetimes/error-handling.rs
@@ -1,7 +1,10 @@
 // compile-flags:-Zborrowck=mir
 
 #![feature(member_constraints)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 #[derive(Clone)]
 struct CopyIfEq<T, U>(T, U);
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-pick-original-type-alias-impl-trait.rs b/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-pick-original-type-alias-impl-trait.rs
index 877940c7403..9d345502aab 100644
--- a/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-pick-original-type-alias-impl-trait.rs
+++ b/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-pick-original-type-alias-impl-trait.rs
@@ -4,8 +4,7 @@
 //[mir]compile-flags: -Z borrowck=mir
 
 #![feature(member_constraints)]
-#![feature(type_alias_impl_trait)]
-
+#![feature(min_type_alias_impl_trait)]
 trait Trait<'a, 'b> { }
 impl<T> Trait<'_, '_> for T { }
 
diff --git a/src/test/ui/impl-trait/negative-reasoning.full_tait.stderr b/src/test/ui/impl-trait/negative-reasoning.full_tait.stderr
new file mode 100644
index 00000000000..2611205893f
--- /dev/null
+++ b/src/test/ui/impl-trait/negative-reasoning.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/negative-reasoning.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0119]: conflicting implementations of trait `AnotherTrait` for type `D<impl OpaqueTrait>`:
+  --> $DIR/negative-reasoning.rs:22:1
+   |
+LL | impl<T: std::fmt::Debug> AnotherTrait for T {}
+   | ------------------------------------------- first implementation here
+...
+LL | impl AnotherTrait for D<OpaqueType> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `D<impl OpaqueTrait>`
+   |
+   = note: upstream crates may add a new impl of trait `std::fmt::Debug` for type `impl OpaqueTrait` in future versions
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0119`.
diff --git a/src/test/ui/impl-trait/negative-reasoning.stderr b/src/test/ui/impl-trait/negative-reasoning.min_tait.stderr
similarity index 94%
rename from src/test/ui/impl-trait/negative-reasoning.stderr
rename to src/test/ui/impl-trait/negative-reasoning.min_tait.stderr
index e43d8c857b2..bd74b56fecc 100644
--- a/src/test/ui/impl-trait/negative-reasoning.stderr
+++ b/src/test/ui/impl-trait/negative-reasoning.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0119]: conflicting implementations of trait `AnotherTrait` for type `D<impl OpaqueTrait>`:
-  --> $DIR/negative-reasoning.rs:19:1
+  --> $DIR/negative-reasoning.rs:22:1
    |
 LL | impl<T: std::fmt::Debug> AnotherTrait for T {}
    | ------------------------------------------- first implementation here
diff --git a/src/test/ui/impl-trait/negative-reasoning.rs b/src/test/ui/impl-trait/negative-reasoning.rs
index d173fe83fb7..7f608cc99db 100644
--- a/src/test/ui/impl-trait/negative-reasoning.rs
+++ b/src/test/ui/impl-trait/negative-reasoning.rs
@@ -1,6 +1,9 @@
 // Tests that we cannot assume that an opaque type does *not* implement some
 // other trait
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait OpaqueTrait {}
 impl<T> OpaqueTrait for T {}
diff --git a/src/test/ui/impl-trait/type-alias-generic-param.full_tait.stderr b/src/test/ui/impl-trait/type-alias-generic-param.full_tait.stderr
new file mode 100644
index 00000000000..965e3e4887b
--- /dev/null
+++ b/src/test/ui/impl-trait/type-alias-generic-param.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-generic-param.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/type-alias-generic-param.rs b/src/test/ui/impl-trait/type-alias-generic-param.rs
index d834d9bb112..733e10e56f8 100644
--- a/src/test/ui/impl-trait/type-alias-generic-param.rs
+++ b/src/test/ui/impl-trait/type-alias-generic-param.rs
@@ -3,7 +3,10 @@
 // types in 'item' position when generic parameters are involved
 //
 // run-pass
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Meow {
     type MeowType;
diff --git a/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.full_tait.stderr b/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.full_tait.stderr
new file mode 100644
index 00000000000..ec939e5718a
--- /dev/null
+++ b/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-in-fn-body.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs b/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs
index 91be4efd56a..32ca4af3043 100644
--- a/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs
+++ b/src/test/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs
@@ -1,6 +1,9 @@
 // build-pass (FIXME(62277): could be check-pass?)
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/impl-trait/where-allowed.stderr b/src/test/ui/impl-trait/where-allowed.stderr
index 93f9724140e..3fdeddc0a86 100644
--- a/src/test/ui/impl-trait/where-allowed.stderr
+++ b/src/test/ui/impl-trait/where-allowed.stderr
@@ -23,7 +23,7 @@ LL |     type Out = impl Debug;
    |                ^^^^^^^^^^
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
 
 error[E0658]: `impl Trait` in type aliases is unstable
   --> $DIR/where-allowed.rs:157:23
@@ -32,7 +32,7 @@ LL | type InTypeAlias<R> = impl Debug;
    |                       ^^^^^^^^^^
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
 
 error[E0658]: `impl Trait` in type aliases is unstable
   --> $DIR/where-allowed.rs:161:39
@@ -41,7 +41,7 @@ LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
    |                                       ^^^^^^^^^^
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
 
 error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
   --> $DIR/where-allowed.rs:15:40
diff --git a/src/test/ui/issues/issue-60662.full_tait.stderr b/src/test/ui/issues/issue-60662.full_tait.stderr
new file mode 100644
index 00000000000..a448f85b762
--- /dev/null
+++ b/src/test/ui/issues/issue-60662.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-60662.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/issues/issue-60662.stdout b/src/test/ui/issues/issue-60662.full_tait.stdout
similarity index 78%
rename from src/test/ui/issues/issue-60662.stdout
rename to src/test/ui/issues/issue-60662.full_tait.stdout
index 14a49f20e6b..9ee4434d559 100644
--- a/src/test/ui/issues/issue-60662.stdout
+++ b/src/test/ui/issues/issue-60662.full_tait.stdout
@@ -1,6 +1,8 @@
 // check-pass
 // compile-flags: -Z unpretty=hir
 
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
 #![feature(type_alias_impl_trait)]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
diff --git a/src/test/ui/issues/issue-60662.min_tait.stdout b/src/test/ui/issues/issue-60662.min_tait.stdout
new file mode 100644
index 00000000000..d0db578f570
--- /dev/null
+++ b/src/test/ui/issues/issue-60662.min_tait.stdout
@@ -0,0 +1,15 @@
+// check-pass
+// compile-flags: -Z unpretty=hir
+
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#[prelude_import]
+use ::std::prelude::rust_2015::*;
+#[macro_use]
+extern crate std;
+
+trait Animal { }
+
+fn main() {
+              pub type ServeFut = /*impl Trait*/;
+          }
diff --git a/src/test/ui/issues/issue-60662.rs b/src/test/ui/issues/issue-60662.rs
index 967c5f8ed73..1320d2bbe93 100644
--- a/src/test/ui/issues/issue-60662.rs
+++ b/src/test/ui/issues/issue-60662.rs
@@ -1,7 +1,10 @@
 // check-pass
 // compile-flags: -Z unpretty=hir
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Animal {
 }
diff --git a/src/test/ui/layout/debug.rs b/src/test/ui/layout/debug.rs
index 299151df664..317955f0e39 100644
--- a/src/test/ui/layout/debug.rs
+++ b/src/test/ui/layout/debug.rs
@@ -1,5 +1,5 @@
 // normalize-stderr-test "pref: Align \{\n *pow2: [1-3],\n *\}" -> "pref: $$PREF_ALIGN"
-#![feature(never_type, rustc_attrs, type_alias_impl_trait)]
+#![feature(never_type, rustc_attrs, min_type_alias_impl_trait)]
 #![crate_type = "lib"]
 
 #[rustc_layout(debug)]
diff --git a/src/test/ui/layout/hexagon-enum.rs b/src/test/ui/layout/hexagon-enum.rs
index 8c6c9720664..4c58537e309 100644
--- a/src/test/ui/layout/hexagon-enum.rs
+++ b/src/test/ui/layout/hexagon-enum.rs
@@ -4,7 +4,7 @@
 // Verify that the hexagon targets implement the repr(C) for enums correctly.
 //
 // See #82100
-#![feature(never_type, rustc_attrs, type_alias_impl_trait, no_core, lang_items)]
+#![feature(never_type, rustc_attrs, no_core, lang_items)]
 #![crate_type = "lib"]
 #![no_core]
 
diff --git a/src/test/ui/lint/inline-trait-and-foreign-items.full_tait.stderr b/src/test/ui/lint/inline-trait-and-foreign-items.full_tait.stderr
new file mode 100644
index 00000000000..65b4631010f
--- /dev/null
+++ b/src/test/ui/lint/inline-trait-and-foreign-items.full_tait.stderr
@@ -0,0 +1,81 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/inline-trait-and-foreign-items.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: `#[inline]` is ignored on constants
+  --> $DIR/inline-trait-and-foreign-items.rs:10:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/inline-trait-and-foreign-items.rs:7:9
+   |
+LL | #![warn(unused_attributes)]
+   |         ^^^^^^^^^^^^^^^^^
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: see issue #65833 <https://github.com/rust-lang/rust/issues/65833> for more information
+
+error[E0518]: attribute should be applied to function or closure
+  --> $DIR/inline-trait-and-foreign-items.rs:14:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+LL |     type T;
+   |     ------- not a function or closure
+
+warning: `#[inline]` is ignored on constants
+  --> $DIR/inline-trait-and-foreign-items.rs:21:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: see issue #65833 <https://github.com/rust-lang/rust/issues/65833> for more information
+
+error[E0518]: attribute should be applied to function or closure
+  --> $DIR/inline-trait-and-foreign-items.rs:25:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+LL |     type T = Self;
+   |     -------------- not a function or closure
+
+error[E0518]: attribute should be applied to function or closure
+  --> $DIR/inline-trait-and-foreign-items.rs:28:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+LL |     type U = impl Trait;
+   |     -------------------- not a function or closure
+
+error[E0518]: attribute should be applied to function or closure
+  --> $DIR/inline-trait-and-foreign-items.rs:33:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+LL |     static X: u32;
+   |     -------------- not a function or closure
+
+error[E0518]: attribute should be applied to function or closure
+  --> $DIR/inline-trait-and-foreign-items.rs:36:5
+   |
+LL |     #[inline]
+   |     ^^^^^^^^^
+LL |     type T;
+   |     ------- not a function or closure
+
+error: could not find defining uses
+  --> $DIR/inline-trait-and-foreign-items.rs:29:14
+   |
+LL |     type U = impl Trait;
+   |              ^^^^^^^^^^
+
+error: aborting due to 6 previous errors; 3 warnings emitted
+
+For more information about this error, try `rustc --explain E0518`.
diff --git a/src/test/ui/lint/inline-trait-and-foreign-items.stderr b/src/test/ui/lint/inline-trait-and-foreign-items.min_tait.stderr
similarity index 85%
rename from src/test/ui/lint/inline-trait-and-foreign-items.stderr
rename to src/test/ui/lint/inline-trait-and-foreign-items.min_tait.stderr
index 6ac884c12ce..b9f123905a7 100644
--- a/src/test/ui/lint/inline-trait-and-foreign-items.stderr
+++ b/src/test/ui/lint/inline-trait-and-foreign-items.min_tait.stderr
@@ -1,11 +1,11 @@
 warning: `#[inline]` is ignored on constants
-  --> $DIR/inline-trait-and-foreign-items.rs:7:5
+  --> $DIR/inline-trait-and-foreign-items.rs:10:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
    |
 note: the lint level is defined here
-  --> $DIR/inline-trait-and-foreign-items.rs:4:9
+  --> $DIR/inline-trait-and-foreign-items.rs:7:9
    |
 LL | #![warn(unused_attributes)]
    |         ^^^^^^^^^^^^^^^^^
@@ -13,7 +13,7 @@ LL | #![warn(unused_attributes)]
    = note: see issue #65833 <https://github.com/rust-lang/rust/issues/65833> for more information
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/inline-trait-and-foreign-items.rs:11:5
+  --> $DIR/inline-trait-and-foreign-items.rs:14:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
@@ -21,7 +21,7 @@ LL |     type T;
    |     ------- not a function or closure
 
 warning: `#[inline]` is ignored on constants
-  --> $DIR/inline-trait-and-foreign-items.rs:18:5
+  --> $DIR/inline-trait-and-foreign-items.rs:21:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
@@ -30,7 +30,7 @@ LL |     #[inline]
    = note: see issue #65833 <https://github.com/rust-lang/rust/issues/65833> for more information
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/inline-trait-and-foreign-items.rs:22:5
+  --> $DIR/inline-trait-and-foreign-items.rs:25:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
@@ -38,7 +38,7 @@ LL |     type T = Self;
    |     -------------- not a function or closure
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/inline-trait-and-foreign-items.rs:25:5
+  --> $DIR/inline-trait-and-foreign-items.rs:28:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
@@ -46,7 +46,7 @@ LL |     type U = impl Trait;
    |     -------------------- not a function or closure
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/inline-trait-and-foreign-items.rs:30:5
+  --> $DIR/inline-trait-and-foreign-items.rs:33:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
@@ -54,7 +54,7 @@ LL |     static X: u32;
    |     -------------- not a function or closure
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/inline-trait-and-foreign-items.rs:33:5
+  --> $DIR/inline-trait-and-foreign-items.rs:36:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^
@@ -62,7 +62,7 @@ LL |     type T;
    |     ------- not a function or closure
 
 error: could not find defining uses
-  --> $DIR/inline-trait-and-foreign-items.rs:26:14
+  --> $DIR/inline-trait-and-foreign-items.rs:29:14
    |
 LL |     type U = impl Trait;
    |              ^^^^^^^^^^
diff --git a/src/test/ui/lint/inline-trait-and-foreign-items.rs b/src/test/ui/lint/inline-trait-and-foreign-items.rs
index 6321b3c76e4..3103cc9d31d 100644
--- a/src/test/ui/lint/inline-trait-and-foreign-items.rs
+++ b/src/test/ui/lint/inline-trait-and-foreign-items.rs
@@ -1,5 +1,8 @@
 #![feature(extern_types)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 #![warn(unused_attributes)]
 
diff --git a/src/test/ui/lint/lint-ctypes-73249-2.full_tait.stderr b/src/test/ui/lint/lint-ctypes-73249-2.full_tait.stderr
new file mode 100644
index 00000000000..619ca15839b
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73249-2.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/lint-ctypes-73249-2.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `extern` block uses type `impl Baz`, which is not FFI-safe
+  --> $DIR/lint-ctypes-73249-2.rs:29:25
+   |
+LL |     pub fn lint_me() -> A<()>;
+   |                         ^^^^^ not FFI-safe
+   |
+note: the lint level is defined here
+  --> $DIR/lint-ctypes-73249-2.rs:5:9
+   |
+LL | #![deny(improper_ctypes)]
+   |         ^^^^^^^^^^^^^^^
+   = note: opaque types have no C equivalent
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/lint/lint-ctypes-73249-2.stderr b/src/test/ui/lint/lint-ctypes-73249-2.min_tait.stderr
similarity index 81%
rename from src/test/ui/lint/lint-ctypes-73249-2.stderr
rename to src/test/ui/lint/lint-ctypes-73249-2.min_tait.stderr
index 36dbe3217d7..479bd574473 100644
--- a/src/test/ui/lint/lint-ctypes-73249-2.stderr
+++ b/src/test/ui/lint/lint-ctypes-73249-2.min_tait.stderr
@@ -1,11 +1,11 @@
 error: `extern` block uses type `impl Baz`, which is not FFI-safe
-  --> $DIR/lint-ctypes-73249-2.rs:26:25
+  --> $DIR/lint-ctypes-73249-2.rs:29:25
    |
 LL |     pub fn lint_me() -> A<()>;
    |                         ^^^^^ not FFI-safe
    |
 note: the lint level is defined here
-  --> $DIR/lint-ctypes-73249-2.rs:2:9
+  --> $DIR/lint-ctypes-73249-2.rs:5:9
    |
 LL | #![deny(improper_ctypes)]
    |         ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/lint/lint-ctypes-73249-2.rs b/src/test/ui/lint/lint-ctypes-73249-2.rs
index 86cc5e2c31e..f3313f89217 100644
--- a/src/test/ui/lint/lint-ctypes-73249-2.rs
+++ b/src/test/ui/lint/lint-ctypes-73249-2.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 pub trait Baz { }
diff --git a/src/test/ui/lint/lint-ctypes-73249-3.full_tait.stderr b/src/test/ui/lint/lint-ctypes-73249-3.full_tait.stderr
new file mode 100644
index 00000000000..af0f26a9f43
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73249-3.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/lint-ctypes-73249-3.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `extern` block uses type `impl Baz`, which is not FFI-safe
+  --> $DIR/lint-ctypes-73249-3.rs:21:25
+   |
+LL |     pub fn lint_me() -> A;
+   |                         ^ not FFI-safe
+   |
+note: the lint level is defined here
+  --> $DIR/lint-ctypes-73249-3.rs:5:9
+   |
+LL | #![deny(improper_ctypes)]
+   |         ^^^^^^^^^^^^^^^
+   = note: opaque types have no C equivalent
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/lint/lint-ctypes-73249-3.stderr b/src/test/ui/lint/lint-ctypes-73249-3.min_tait.stderr
similarity index 81%
rename from src/test/ui/lint/lint-ctypes-73249-3.stderr
rename to src/test/ui/lint/lint-ctypes-73249-3.min_tait.stderr
index 7d133287bd7..880581ff05d 100644
--- a/src/test/ui/lint/lint-ctypes-73249-3.stderr
+++ b/src/test/ui/lint/lint-ctypes-73249-3.min_tait.stderr
@@ -1,11 +1,11 @@
 error: `extern` block uses type `impl Baz`, which is not FFI-safe
-  --> $DIR/lint-ctypes-73249-3.rs:18:25
+  --> $DIR/lint-ctypes-73249-3.rs:21:25
    |
 LL |     pub fn lint_me() -> A;
    |                         ^ not FFI-safe
    |
 note: the lint level is defined here
-  --> $DIR/lint-ctypes-73249-3.rs:2:9
+  --> $DIR/lint-ctypes-73249-3.rs:5:9
    |
 LL | #![deny(improper_ctypes)]
    |         ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/lint/lint-ctypes-73249-3.rs b/src/test/ui/lint/lint-ctypes-73249-3.rs
index 25c4e7c92a8..966c7d5ce3c 100644
--- a/src/test/ui/lint/lint-ctypes-73249-3.rs
+++ b/src/test/ui/lint/lint-ctypes-73249-3.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 pub trait Baz { }
diff --git a/src/test/ui/lint/lint-ctypes-73249-5.full_tait.stderr b/src/test/ui/lint/lint-ctypes-73249-5.full_tait.stderr
new file mode 100644
index 00000000000..b80084fce06
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73249-5.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/lint-ctypes-73249-5.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `extern` block uses type `impl Baz`, which is not FFI-safe
+  --> $DIR/lint-ctypes-73249-5.rs:21:25
+   |
+LL |     pub fn lint_me() -> A;
+   |                         ^ not FFI-safe
+   |
+note: the lint level is defined here
+  --> $DIR/lint-ctypes-73249-5.rs:5:9
+   |
+LL | #![deny(improper_ctypes)]
+   |         ^^^^^^^^^^^^^^^
+   = note: opaque types have no C equivalent
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/lint/lint-ctypes-73249-5.stderr b/src/test/ui/lint/lint-ctypes-73249-5.min_tait.stderr
similarity index 81%
rename from src/test/ui/lint/lint-ctypes-73249-5.stderr
rename to src/test/ui/lint/lint-ctypes-73249-5.min_tait.stderr
index d2780cb60e7..f42549d9096 100644
--- a/src/test/ui/lint/lint-ctypes-73249-5.stderr
+++ b/src/test/ui/lint/lint-ctypes-73249-5.min_tait.stderr
@@ -1,11 +1,11 @@
 error: `extern` block uses type `impl Baz`, which is not FFI-safe
-  --> $DIR/lint-ctypes-73249-5.rs:18:25
+  --> $DIR/lint-ctypes-73249-5.rs:21:25
    |
 LL |     pub fn lint_me() -> A;
    |                         ^ not FFI-safe
    |
 note: the lint level is defined here
-  --> $DIR/lint-ctypes-73249-5.rs:2:9
+  --> $DIR/lint-ctypes-73249-5.rs:5:9
    |
 LL | #![deny(improper_ctypes)]
    |         ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/lint/lint-ctypes-73249-5.rs b/src/test/ui/lint/lint-ctypes-73249-5.rs
index 61e46983ede..81979a9b6e6 100644
--- a/src/test/ui/lint/lint-ctypes-73249-5.rs
+++ b/src/test/ui/lint/lint-ctypes-73249-5.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 pub trait Baz { }
diff --git a/src/test/ui/lint/lint-ctypes-73251-1.full_tait.stderr b/src/test/ui/lint/lint-ctypes-73251-1.full_tait.stderr
new file mode 100644
index 00000000000..5610230380b
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73251-1.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/lint-ctypes-73251-1.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `extern` block uses type `impl Baz`, which is not FFI-safe
+  --> $DIR/lint-ctypes-73251-1.rs:24:25
+   |
+LL |     pub fn lint_me() -> <u32 as Foo>::Assoc;
+   |                         ^^^^^^^^^^^^^^^^^^^ not FFI-safe
+   |
+note: the lint level is defined here
+  --> $DIR/lint-ctypes-73251-1.rs:5:9
+   |
+LL | #![deny(improper_ctypes)]
+   |         ^^^^^^^^^^^^^^^
+   = note: opaque types have no C equivalent
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/lint/lint-ctypes-73251-1.stderr b/src/test/ui/lint/lint-ctypes-73251-1.min_tait.stderr
similarity index 82%
rename from src/test/ui/lint/lint-ctypes-73251-1.stderr
rename to src/test/ui/lint/lint-ctypes-73251-1.min_tait.stderr
index 0b4237bb96f..5b00fc4cce6 100644
--- a/src/test/ui/lint/lint-ctypes-73251-1.stderr
+++ b/src/test/ui/lint/lint-ctypes-73251-1.min_tait.stderr
@@ -1,11 +1,11 @@
 error: `extern` block uses type `impl Baz`, which is not FFI-safe
-  --> $DIR/lint-ctypes-73251-1.rs:21:25
+  --> $DIR/lint-ctypes-73251-1.rs:24:25
    |
 LL |     pub fn lint_me() -> <u32 as Foo>::Assoc;
    |                         ^^^^^^^^^^^^^^^^^^^ not FFI-safe
    |
 note: the lint level is defined here
-  --> $DIR/lint-ctypes-73251-1.rs:2:9
+  --> $DIR/lint-ctypes-73251-1.rs:5:9
    |
 LL | #![deny(improper_ctypes)]
    |         ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/lint/lint-ctypes-73251-1.rs b/src/test/ui/lint/lint-ctypes-73251-1.rs
index 2ce80982f5c..3f15a2fb42c 100644
--- a/src/test/ui/lint/lint-ctypes-73251-1.rs
+++ b/src/test/ui/lint/lint-ctypes-73251-1.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 pub trait Baz { }
diff --git a/src/test/ui/lint/lint-ctypes-73251-2.full_tait.stderr b/src/test/ui/lint/lint-ctypes-73251-2.full_tait.stderr
new file mode 100644
index 00000000000..19911264a36
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73251-2.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/lint-ctypes-73251-2.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `extern` block uses type `impl TraitA`, which is not FFI-safe
+  --> $DIR/lint-ctypes-73251-2.rs:32:25
+   |
+LL |     pub fn lint_me() -> <AliasB as TraitB>::Assoc;
+   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
+   |
+note: the lint level is defined here
+  --> $DIR/lint-ctypes-73251-2.rs:5:9
+   |
+LL | #![deny(improper_ctypes)]
+   |         ^^^^^^^^^^^^^^^
+   = note: opaque types have no C equivalent
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/lint/lint-ctypes-73251-2.stderr b/src/test/ui/lint/lint-ctypes-73251-2.min_tait.stderr
similarity index 83%
rename from src/test/ui/lint/lint-ctypes-73251-2.stderr
rename to src/test/ui/lint/lint-ctypes-73251-2.min_tait.stderr
index 43f7629b043..4130ee7b4cb 100644
--- a/src/test/ui/lint/lint-ctypes-73251-2.stderr
+++ b/src/test/ui/lint/lint-ctypes-73251-2.min_tait.stderr
@@ -1,11 +1,11 @@
 error: `extern` block uses type `impl TraitA`, which is not FFI-safe
-  --> $DIR/lint-ctypes-73251-2.rs:29:25
+  --> $DIR/lint-ctypes-73251-2.rs:32:25
    |
 LL |     pub fn lint_me() -> <AliasB as TraitB>::Assoc;
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
    |
 note: the lint level is defined here
-  --> $DIR/lint-ctypes-73251-2.rs:2:9
+  --> $DIR/lint-ctypes-73251-2.rs:5:9
    |
 LL | #![deny(improper_ctypes)]
    |         ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/lint/lint-ctypes-73251-2.rs b/src/test/ui/lint/lint-ctypes-73251-2.rs
index 3427c657b42..888671daca5 100644
--- a/src/test/ui/lint/lint-ctypes-73251-2.rs
+++ b/src/test/ui/lint/lint-ctypes-73251-2.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 pub trait TraitA {
diff --git a/src/test/ui/lint/lint-ctypes-73251.full_tait.stderr b/src/test/ui/lint/lint-ctypes-73251.full_tait.stderr
new file mode 100644
index 00000000000..577cf6cf545
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73251.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/lint-ctypes-73251.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/lint/lint-ctypes-73251.rs b/src/test/ui/lint/lint-ctypes-73251.rs
index ebc2ca77b67..36e541612d1 100644
--- a/src/test/ui/lint/lint-ctypes-73251.rs
+++ b/src/test/ui/lint/lint-ctypes-73251.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 pub trait Foo {
diff --git a/src/test/ui/lint/opaque-ty-ffi-unsafe.full_tait.stderr b/src/test/ui/lint/opaque-ty-ffi-unsafe.full_tait.stderr
new file mode 100644
index 00000000000..5433d6e6ae2
--- /dev/null
+++ b/src/test/ui/lint/opaque-ty-ffi-unsafe.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/opaque-ty-ffi-unsafe.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `extern` block uses type `impl Fn<()>`, which is not FFI-safe
+  --> $DIR/opaque-ty-ffi-unsafe.rs:14:17
+   |
+LL |     pub fn a(_: A);
+   |                 ^ not FFI-safe
+   |
+note: the lint level is defined here
+  --> $DIR/opaque-ty-ffi-unsafe.rs:5:9
+   |
+LL | #![deny(improper_ctypes)]
+   |         ^^^^^^^^^^^^^^^
+   = note: opaque types have no C equivalent
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/lint/opaque-ty-ffi-unsafe.stderr b/src/test/ui/lint/opaque-ty-ffi-unsafe.min_tait.stderr
similarity index 80%
rename from src/test/ui/lint/opaque-ty-ffi-unsafe.stderr
rename to src/test/ui/lint/opaque-ty-ffi-unsafe.min_tait.stderr
index 9d46f6d936e..2f20912d2a6 100644
--- a/src/test/ui/lint/opaque-ty-ffi-unsafe.stderr
+++ b/src/test/ui/lint/opaque-ty-ffi-unsafe.min_tait.stderr
@@ -1,11 +1,11 @@
 error: `extern` block uses type `impl Fn<()>`, which is not FFI-safe
-  --> $DIR/opaque-ty-ffi-unsafe.rs:11:17
+  --> $DIR/opaque-ty-ffi-unsafe.rs:14:17
    |
 LL |     pub fn a(_: A);
    |                 ^ not FFI-safe
    |
 note: the lint level is defined here
-  --> $DIR/opaque-ty-ffi-unsafe.rs:2:9
+  --> $DIR/opaque-ty-ffi-unsafe.rs:5:9
    |
 LL | #![deny(improper_ctypes)]
    |         ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/lint/opaque-ty-ffi-unsafe.rs b/src/test/ui/lint/opaque-ty-ffi-unsafe.rs
index 4ceb0c3da08..0e9df919552 100644
--- a/src/test/ui/lint/opaque-ty-ffi-unsafe.rs
+++ b/src/test/ui/lint/opaque-ty-ffi-unsafe.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(improper_ctypes)]
 
 type A = impl Fn();
diff --git a/src/test/ui/mir/issue-75053.rs b/src/test/ui/mir/issue-75053.rs
index d54e23169c4..d3d1002cd62 100644
--- a/src/test/ui/mir/issue-75053.rs
+++ b/src/test/ui/mir/issue-75053.rs
@@ -1,7 +1,7 @@
 // compile-flags: -Z mir-opt-level=3
 // build-pass
 
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 
 use std::marker::PhantomData;
 
diff --git a/src/test/ui/privacy/private-in-public-assoc-ty.full_tait.stderr b/src/test/ui/privacy/private-in-public-assoc-ty.full_tait.stderr
new file mode 100644
index 00000000000..a74c7c93a2e
--- /dev/null
+++ b/src/test/ui/privacy/private-in-public-assoc-ty.full_tait.stderr
@@ -0,0 +1,77 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/private-in-public-assoc-ty.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0446]: private type `Priv` in public interface
+  --> $DIR/private-in-public-assoc-ty.rs:20:9
+   |
+LL |     struct Priv;
+   |     ------------ `Priv` declared as private
+...
+LL |         type A = Priv;
+   |         ^^^^^^^^^^^^^^ can't leak private type
+
+warning: private trait `PrivTr` in public interface (error E0445)
+  --> $DIR/private-in-public-assoc-ty.rs:27:9
+   |
+LL |         type Alias1: PrivTr;
+   |         ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(private_in_public)]` on by default
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
+
+warning: private type `Priv` in public interface (error E0446)
+  --> $DIR/private-in-public-assoc-ty.rs:30:9
+   |
+LL |         type Alias2: PubTrAux1<Priv> = u8;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
+
+warning: private type `Priv` in public interface (error E0446)
+  --> $DIR/private-in-public-assoc-ty.rs:33:9
+   |
+LL |         type Alias3: PubTrAux2<A = Priv> = u8;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
+
+error[E0446]: private type `Priv` in public interface
+  --> $DIR/private-in-public-assoc-ty.rs:37:9
+   |
+LL |     struct Priv;
+   |     ------------ `Priv` declared as private
+...
+LL |         type Alias4 = Priv;
+   |         ^^^^^^^^^^^^^^^^^^^ can't leak private type
+
+error[E0446]: private type `Priv` in public interface
+  --> $DIR/private-in-public-assoc-ty.rs:44:9
+   |
+LL |     struct Priv;
+   |     ------------ `Priv` declared as private
+...
+LL |         type Alias1 = Priv;
+   |         ^^^^^^^^^^^^^^^^^^^ can't leak private type
+
+error[E0445]: private trait `PrivTr` in public interface
+  --> $DIR/private-in-public-assoc-ty.rs:47:9
+   |
+LL |     trait PrivTr {}
+   |     ------------ `PrivTr` declared as private
+...
+LL |         type Exist = impl PrivTr;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak private trait
+
+error: aborting due to 4 previous errors; 4 warnings emitted
+
+Some errors have detailed explanations: E0445, E0446.
+For more information about an error, try `rustc --explain E0445`.
diff --git a/src/test/ui/privacy/private-in-public-assoc-ty.stderr b/src/test/ui/privacy/private-in-public-assoc-ty.min_tait.stderr
similarity index 93%
rename from src/test/ui/privacy/private-in-public-assoc-ty.stderr
rename to src/test/ui/privacy/private-in-public-assoc-ty.min_tait.stderr
index ba62a228b09..36230ffd04b 100644
--- a/src/test/ui/privacy/private-in-public-assoc-ty.stderr
+++ b/src/test/ui/privacy/private-in-public-assoc-ty.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0446]: private type `Priv` in public interface
-  --> $DIR/private-in-public-assoc-ty.rs:17:9
+  --> $DIR/private-in-public-assoc-ty.rs:20:9
    |
 LL |     struct Priv;
    |     ------------ `Priv` declared as private
@@ -8,7 +8,7 @@ LL |         type A = Priv;
    |         ^^^^^^^^^^^^^^ can't leak private type
 
 warning: private trait `PrivTr` in public interface (error E0445)
-  --> $DIR/private-in-public-assoc-ty.rs:24:9
+  --> $DIR/private-in-public-assoc-ty.rs:27:9
    |
 LL |         type Alias1: PrivTr;
    |         ^^^^^^^^^^^^^^^^^^^^
@@ -18,7 +18,7 @@ LL |         type Alias1: PrivTr;
    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
 
 warning: private type `Priv` in public interface (error E0446)
-  --> $DIR/private-in-public-assoc-ty.rs:27:9
+  --> $DIR/private-in-public-assoc-ty.rs:30:9
    |
 LL |         type Alias2: PubTrAux1<Priv> = u8;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -27,7 +27,7 @@ LL |         type Alias2: PubTrAux1<Priv> = u8;
    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
 
 warning: private type `Priv` in public interface (error E0446)
-  --> $DIR/private-in-public-assoc-ty.rs:30:9
+  --> $DIR/private-in-public-assoc-ty.rs:33:9
    |
 LL |         type Alias3: PubTrAux2<A = Priv> = u8;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -36,7 +36,7 @@ LL |         type Alias3: PubTrAux2<A = Priv> = u8;
    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
 
 error[E0446]: private type `Priv` in public interface
-  --> $DIR/private-in-public-assoc-ty.rs:34:9
+  --> $DIR/private-in-public-assoc-ty.rs:37:9
    |
 LL |     struct Priv;
    |     ------------ `Priv` declared as private
@@ -45,7 +45,7 @@ LL |         type Alias4 = Priv;
    |         ^^^^^^^^^^^^^^^^^^^ can't leak private type
 
 error[E0446]: private type `Priv` in public interface
-  --> $DIR/private-in-public-assoc-ty.rs:41:9
+  --> $DIR/private-in-public-assoc-ty.rs:44:9
    |
 LL |     struct Priv;
    |     ------------ `Priv` declared as private
@@ -54,7 +54,7 @@ LL |         type Alias1 = Priv;
    |         ^^^^^^^^^^^^^^^^^^^ can't leak private type
 
 error[E0445]: private trait `PrivTr` in public interface
-  --> $DIR/private-in-public-assoc-ty.rs:44:9
+  --> $DIR/private-in-public-assoc-ty.rs:47:9
    |
 LL |     trait PrivTr {}
    |     ------------ `PrivTr` declared as private
diff --git a/src/test/ui/privacy/private-in-public-assoc-ty.rs b/src/test/ui/privacy/private-in-public-assoc-ty.rs
index fba72c13170..f8fb5659430 100644
--- a/src/test/ui/privacy/private-in-public-assoc-ty.rs
+++ b/src/test/ui/privacy/private-in-public-assoc-ty.rs
@@ -2,7 +2,10 @@
 // This test also ensures that the checks are performed even inside private modules.
 
 #![feature(associated_type_defaults)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 mod m {
     struct Priv;
diff --git a/src/test/ui/privacy/private-in-public-type-alias-impl-trait.full_tait.stderr b/src/test/ui/privacy/private-in-public-type-alias-impl-trait.full_tait.stderr
new file mode 100644
index 00000000000..c419c7ee4d4
--- /dev/null
+++ b/src/test/ui/privacy/private-in-public-type-alias-impl-trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/private-in-public-type-alias-impl-trait.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/privacy/private-in-public-type-alias-impl-trait.rs b/src/test/ui/privacy/private-in-public-type-alias-impl-trait.rs
index 40bba720b0f..8443631253f 100644
--- a/src/test/ui/privacy/private-in-public-type-alias-impl-trait.rs
+++ b/src/test/ui/privacy/private-in-public-type-alias-impl-trait.rs
@@ -1,6 +1,9 @@
 // build-pass (FIXME(62277): could be check-pass?)
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![deny(private_in_public)]
 
 pub type Pub = impl Default;
diff --git a/src/test/ui/save-analysis/issue-68621.full_tait.stderr b/src/test/ui/save-analysis/issue-68621.full_tait.stderr
new file mode 100644
index 00000000000..193aed2615c
--- /dev/null
+++ b/src/test/ui/save-analysis/issue-68621.full_tait.stderr
@@ -0,0 +1,17 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-68621.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: could not find defining uses
+  --> $DIR/issue-68621.rs:17:19
+   |
+LL |     type Future = impl Trait;
+   |                   ^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/save-analysis/issue-68621.stderr b/src/test/ui/save-analysis/issue-68621.min_tait.stderr
similarity index 82%
rename from src/test/ui/save-analysis/issue-68621.stderr
rename to src/test/ui/save-analysis/issue-68621.min_tait.stderr
index 3af6d0a3e07..cccfb3de8fb 100644
--- a/src/test/ui/save-analysis/issue-68621.stderr
+++ b/src/test/ui/save-analysis/issue-68621.min_tait.stderr
@@ -1,5 +1,5 @@
 error: could not find defining uses
-  --> $DIR/issue-68621.rs:14:19
+  --> $DIR/issue-68621.rs:17:19
    |
 LL |     type Future = impl Trait;
    |                   ^^^^^^^^^^
diff --git a/src/test/ui/save-analysis/issue-68621.rs b/src/test/ui/save-analysis/issue-68621.rs
index 96af085c5b6..1f4a9080cc9 100644
--- a/src/test/ui/save-analysis/issue-68621.rs
+++ b/src/test/ui/save-analysis/issue-68621.rs
@@ -1,6 +1,9 @@
 // compile-flags: -Zsave-analysis
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Trait {}
 
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-const.full_tait.stderr b/src/test/ui/type-alias-impl-trait/assoc-type-const.full_tait.stderr
new file mode 100644
index 00000000000..7b43d1d86bc
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-const.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/assoc-type-const.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/assoc-type-const.rs:9:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-const.stderr b/src/test/ui/type-alias-impl-trait/assoc-type-const.min_tait.stderr
similarity index 91%
rename from src/test/ui/type-alias-impl-trait/assoc-type-const.stderr
rename to src/test/ui/type-alias-impl-trait/assoc-type-const.min_tait.stderr
index e0c1b023861..d4b9132cc92 100644
--- a/src/test/ui/type-alias-impl-trait/assoc-type-const.stderr
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-const.min_tait.stderr
@@ -1,5 +1,5 @@
 warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/assoc-type-const.rs:6:12
+  --> $DIR/assoc-type-const.rs:9:12
    |
 LL | #![feature(const_generics)]
    |            ^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-const.rs b/src/test/ui/type-alias-impl-trait/assoc-type-const.rs
index d53f562e99f..be065c3b6be 100644
--- a/src/test/ui/type-alias-impl-trait/assoc-type-const.rs
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-const.rs
@@ -2,7 +2,10 @@
 // const generics in an associated opaque type
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![feature(const_generics)]
 //~^ WARN the feature `const_generics` is incomplete
 
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.full_tait.stderr b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.full_tait.stderr
new file mode 100644
index 00000000000..01263cde8bb
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.full_tait.stderr
@@ -0,0 +1,18 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/assoc-type-lifetime-unconstrained.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/assoc-type-lifetime-unconstrained.rs:20:6
+   |
+LL | impl<'a, I> UnwrapItemsExt for I {
+   |      ^^ unconstrained lifetime parameter
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0207`.
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.stderr b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.min_tait.stderr
similarity index 85%
rename from src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.stderr
rename to src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.min_tait.stderr
index e594dc577b1..afcdab5f479 100644
--- a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.stderr
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/assoc-type-lifetime-unconstrained.rs:17:6
+  --> $DIR/assoc-type-lifetime-unconstrained.rs:20:6
    |
 LL | impl<'a, I> UnwrapItemsExt for I {
    |      ^^ unconstrained lifetime parameter
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.rs b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.rs
index 3f34b00ec77..39cc75e688b 100644
--- a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.rs
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime-unconstrained.rs
@@ -1,7 +1,10 @@
 // Tests that we don't allow unconstrained lifetime parameters in impls when
 // the lifetime is used in an associated opaque type.
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait UnwrapItemsExt {
     type Iter;
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.full_tait.stderr b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.full_tait.stderr
new file mode 100644
index 00000000000..31afbf14e65
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/assoc-type-lifetime.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.rs b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.rs
index 39f785d8cc5..ebbdbb67dbe 100644
--- a/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.rs
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-lifetime.rs
@@ -2,7 +2,10 @@
 // lifetimes are used in an associated opaque type
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait UnwrapItemsExt<'a> {
     type Iter;
diff --git a/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.full_tait.stderr b/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.full_tait.stderr
new file mode 100644
index 00000000000..2c48d815e0d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/associated-type-alias-impl-trait.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.rs b/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.rs
index 42f07d49ffe..8d2b1826790 100644
--- a/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.rs
+++ b/src/test/ui/type-alias-impl-trait/associated-type-alias-impl-trait.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // build-pass (FIXME(62277): could be check-pass?)
 
 trait Bar {}
diff --git a/src/test/ui/type-alias-impl-trait/associated-type-lifetime-ice.rs b/src/test/ui/type-alias-impl-trait/associated-type-lifetime-ice.rs
index 02e1f4f26ee..2a09d0f00f8 100644
--- a/src/test/ui/type-alias-impl-trait/associated-type-lifetime-ice.rs
+++ b/src/test/ui/type-alias-impl-trait/associated-type-lifetime-ice.rs
@@ -7,7 +7,7 @@
 
 // Regression test for https://github.com/rust-lang/rust/issues/78450
 
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
 #![no_std]
 
 pub trait AssociatedImpl {
diff --git a/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice.rs b/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice.rs
index f61807cbdbd..94e1fa73de8 100644
--- a/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice.rs
+++ b/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice.rs
@@ -1,8 +1,10 @@
 // Crate that exports an opaque `impl Trait` type. Used for testing cross-crate.
 
-#![crate_type="rlib"]
-
-#![feature(type_alias_impl_trait)]
+#![crate_type = "rlib"]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub type Foo = impl std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice2.rs b/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice2.rs
index 00823456267..65bc594dcf2 100644
--- a/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice2.rs
+++ b/src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice2.rs
@@ -1,8 +1,10 @@
 // Crate that exports an opaque `impl Trait` type. Used for testing cross-crate.
 
-#![crate_type="rlib"]
-
-#![feature(type_alias_impl_trait)]
+#![crate_type = "rlib"]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait View {
     type Tmp: Iterator<Item = u32>;
diff --git a/src/test/ui/type-alias-impl-trait/bound_reduction.rs b/src/test/ui/type-alias-impl-trait/bound_reduction.rs
index 18c840d8ed9..b45105ea8f2 100644
--- a/src/test/ui/type-alias-impl-trait/bound_reduction.rs
+++ b/src/test/ui/type-alias-impl-trait/bound_reduction.rs
@@ -1,8 +1,9 @@
 // build-pass (FIXME(62277): could be check-pass?)
 
 #![allow(warnings)]
-
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
 
 fn main() {
 }
diff --git a/src/test/ui/type-alias-impl-trait/bound_reduction2.full_tait.stderr b/src/test/ui/type-alias-impl-trait/bound_reduction2.full_tait.stderr
new file mode 100644
index 00000000000..164564e8516
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/bound_reduction2.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/bound_reduction2.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/bound_reduction2.rs:18:46
+   |
+LL | fn foo_desugared<T: TraitWithAssoc>(_: T) -> Foo<T::Assoc> {
+   |                                              ^^^^^^^^^^^^^
+   |
+note: used non-generic type `<T as TraitWithAssoc>::Assoc` for generic parameter
+  --> $DIR/bound_reduction2.rs:12:10
+   |
+LL | type Foo<V> = impl Trait<V>;
+   |          ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/bound_reduction2.stderr b/src/test/ui/type-alias-impl-trait/bound_reduction2.min_tait.stderr
similarity index 83%
rename from src/test/ui/type-alias-impl-trait/bound_reduction2.stderr
rename to src/test/ui/type-alias-impl-trait/bound_reduction2.min_tait.stderr
index c9d6a43b909..d3520a9bac2 100644
--- a/src/test/ui/type-alias-impl-trait/bound_reduction2.stderr
+++ b/src/test/ui/type-alias-impl-trait/bound_reduction2.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/bound_reduction2.rs:15:46
+  --> $DIR/bound_reduction2.rs:18:46
    |
 LL | fn foo_desugared<T: TraitWithAssoc>(_: T) -> Foo<T::Assoc> {
    |                                              ^^^^^^^^^^^^^
    |
 note: used non-generic type `<T as TraitWithAssoc>::Assoc` for generic parameter
-  --> $DIR/bound_reduction2.rs:9:10
+  --> $DIR/bound_reduction2.rs:12:10
    |
 LL | type Foo<V> = impl Trait<V>;
    |          ^
diff --git a/src/test/ui/type-alias-impl-trait/bound_reduction2.rs b/src/test/ui/type-alias-impl-trait/bound_reduction2.rs
index a15074c3593..b94b21e4244 100644
--- a/src/test/ui/type-alias-impl-trait/bound_reduction2.rs
+++ b/src/test/ui/type-alias-impl-trait/bound_reduction2.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.full_tait.stderr b/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.full_tait.stderr
new file mode 100644
index 00000000000..871ef22f3eb
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/bounds-are-checked-2.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0277]: the trait bound `T: Clone` is not satisfied
+  --> $DIR/bounds-are-checked-2.rs:9:13
+   |
+LL | type X<T> = impl Clone;
+   |             ^^^^^^^^^^ the trait `Clone` is not implemented for `T`
+   |
+help: consider restricting type parameter `T`
+   |
+LL | type X<T: Clone> = impl Clone;
+   |         ^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.stderr b/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.min_tait.stderr
similarity index 90%
rename from src/test/ui/type-alias-impl-trait/bounds-are-checked-2.stderr
rename to src/test/ui/type-alias-impl-trait/bounds-are-checked-2.min_tait.stderr
index 26a2f4135cb..20656e5e553 100644
--- a/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.stderr
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `T: Clone` is not satisfied
-  --> $DIR/bounds-are-checked-2.rs:6:13
+  --> $DIR/bounds-are-checked-2.rs:9:13
    |
 LL | type X<T> = impl Clone;
    |             ^^^^^^^^^^ the trait `Clone` is not implemented for `T`
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.rs b/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.rs
index c0359159aeb..fecc2543bce 100644
--- a/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.rs
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked-2.rs
@@ -1,7 +1,10 @@
 // Make sure that we check that impl trait types implement the traits that they
 // claim to.
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type X<T> = impl Clone;
 //~^ ERROR the trait bound `T: Clone` is not satisfied
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked.full_tait.stderr b/src/test/ui/type-alias-impl-trait/bounds-are-checked.full_tait.stderr
new file mode 100644
index 00000000000..ca89421cd8b
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked.full_tait.stderr
@@ -0,0 +1,35 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/bounds-are-checked.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: unnecessary lifetime parameter `'a`
+  --> $DIR/bounds-are-checked.rs:12:6
+   |
+LL | fn f<'a: 'static>(t: &'a str) -> X<'a> {
+   |      ^^^^^^^^^^^
+   |
+   = help: you can use the `'static` lifetime directly, in place of `'a`
+
+error[E0308]: mismatched types
+  --> $DIR/bounds-are-checked.rs:9:14
+   |
+LL | type X<'a> = impl Into<&'static str> + From<&'a str>;
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime mismatch
+   |
+   = note: expected trait `From<&'a str>`
+              found trait `From<&'static str>`
+note: the lifetime `'a` as defined on the item at 9:8...
+  --> $DIR/bounds-are-checked.rs:9:8
+   |
+LL | type X<'a> = impl Into<&'static str> + From<&'a str>;
+   |        ^^
+   = note: ...does not necessarily outlive the static lifetime
+
+error: aborting due to previous error; 2 warnings emitted
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked.stderr b/src/test/ui/type-alias-impl-trait/bounds-are-checked.min_tait.stderr
similarity index 81%
rename from src/test/ui/type-alias-impl-trait/bounds-are-checked.stderr
rename to src/test/ui/type-alias-impl-trait/bounds-are-checked.min_tait.stderr
index d5fafe05887..9a451cb1083 100644
--- a/src/test/ui/type-alias-impl-trait/bounds-are-checked.stderr
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked.min_tait.stderr
@@ -1,5 +1,5 @@
 warning: unnecessary lifetime parameter `'a`
-  --> $DIR/bounds-are-checked.rs:9:6
+  --> $DIR/bounds-are-checked.rs:12:6
    |
 LL | fn f<'a: 'static>(t: &'a str) -> X<'a> {
    |      ^^^^^^^^^^^
@@ -7,15 +7,15 @@ LL | fn f<'a: 'static>(t: &'a str) -> X<'a> {
    = help: you can use the `'static` lifetime directly, in place of `'a`
 
 error[E0308]: mismatched types
-  --> $DIR/bounds-are-checked.rs:6:14
+  --> $DIR/bounds-are-checked.rs:9:14
    |
 LL | type X<'a> = impl Into<&'static str> + From<&'a str>;
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime mismatch
    |
    = note: expected trait `From<&'a str>`
               found trait `From<&'static str>`
-note: the lifetime `'a` as defined on the item at 6:8...
-  --> $DIR/bounds-are-checked.rs:6:8
+note: the lifetime `'a` as defined on the item at 9:8...
+  --> $DIR/bounds-are-checked.rs:9:8
    |
 LL | type X<'a> = impl Into<&'static str> + From<&'a str>;
    |        ^^
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs b/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs
index 759bf4f4f0d..5e1faaa3b08 100644
--- a/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs
@@ -1,7 +1,10 @@
 // Make sure that we check that impl trait types implement the traits that they
 // claim to.
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type X<'a> = impl Into<&'static str> + From<&'a str>;
 //~^ ERROR mismatched types
diff --git a/src/test/ui/type-alias-impl-trait/coherence.full_tait.stderr b/src/test/ui/type-alias-impl-trait/coherence.full_tait.stderr
new file mode 100644
index 00000000000..68de0c961ba
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/coherence.full_tait.stderr
@@ -0,0 +1,18 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/coherence.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/coherence.rs:17:6
+   |
+LL | impl<T> foreign_crate::ForeignTrait for AliasOfForeignType<T> {}
+   |      ^ unconstrained type parameter
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0207`.
diff --git a/src/test/ui/type-alias-impl-trait/coherence.stderr b/src/test/ui/type-alias-impl-trait/coherence.min_tait.stderr
similarity index 91%
rename from src/test/ui/type-alias-impl-trait/coherence.stderr
rename to src/test/ui/type-alias-impl-trait/coherence.min_tait.stderr
index 6ede0fa14ba..4da52369fdb 100644
--- a/src/test/ui/type-alias-impl-trait/coherence.stderr
+++ b/src/test/ui/type-alias-impl-trait/coherence.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/coherence.rs:14:6
+  --> $DIR/coherence.rs:17:6
    |
 LL | impl<T> foreign_crate::ForeignTrait for AliasOfForeignType<T> {}
    |      ^ unconstrained type parameter
diff --git a/src/test/ui/type-alias-impl-trait/coherence.rs b/src/test/ui/type-alias-impl-trait/coherence.rs
index 1c0f83d6c12..51babb0e61b 100644
--- a/src/test/ui/type-alias-impl-trait/coherence.rs
+++ b/src/test/ui/type-alias-impl-trait/coherence.rs
@@ -1,5 +1,8 @@
 // aux-build:foreign-crate.rs
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 extern crate foreign_crate;
 
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_never_defined.full_tait.stderr b/src/test/ui/type-alias-impl-trait/declared_but_never_defined.full_tait.stderr
new file mode 100644
index 00000000000..5fc79cf9561
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/declared_but_never_defined.full_tait.stderr
@@ -0,0 +1,17 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/declared_but_never_defined.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: could not find defining uses
+  --> $DIR/declared_but_never_defined.rs:9:12
+   |
+LL | type Bar = impl std::fmt::Debug;
+   |            ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_never_defined.stderr b/src/test/ui/type-alias-impl-trait/declared_but_never_defined.min_tait.stderr
similarity index 77%
rename from src/test/ui/type-alias-impl-trait/declared_but_never_defined.stderr
rename to src/test/ui/type-alias-impl-trait/declared_but_never_defined.min_tait.stderr
index 21c2e8a9db6..b731e41b149 100644
--- a/src/test/ui/type-alias-impl-trait/declared_but_never_defined.stderr
+++ b/src/test/ui/type-alias-impl-trait/declared_but_never_defined.min_tait.stderr
@@ -1,5 +1,5 @@
 error: could not find defining uses
-  --> $DIR/declared_but_never_defined.rs:6:12
+  --> $DIR/declared_but_never_defined.rs:9:12
    |
 LL | type Bar = impl std::fmt::Debug;
    |            ^^^^^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_never_defined.rs b/src/test/ui/type-alias-impl-trait/declared_but_never_defined.rs
index c4bf56a9197..ac92bea8c47 100644
--- a/src/test/ui/type-alias-impl-trait/declared_but_never_defined.rs
+++ b/src/test/ui/type-alias-impl-trait/declared_but_never_defined.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.full_tait.stderr b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.full_tait.stderr
new file mode 100644
index 00000000000..eeccc598f52
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.full_tait.stderr
@@ -0,0 +1,32 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/declared_but_not_defined_in_scope.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: could not find defining uses
+  --> $DIR/declared_but_not_defined_in_scope.rs:10:20
+   |
+LL |     pub type Boo = impl ::std::fmt::Debug;
+   |                    ^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/declared_but_not_defined_in_scope.rs:14:5
+   |
+LL |     pub type Boo = impl ::std::fmt::Debug;
+   |                    ---------------------- the expected opaque type
+...
+LL | fn bomp() -> boo::Boo {
+   |              -------- expected `impl Debug` because of return type
+LL |     ""
+   |     ^^ expected opaque type, found `&str`
+   |
+   = note: expected opaque type `impl Debug`
+                found reference `&'static str`
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.stderr b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.min_tait.stderr
similarity index 86%
rename from src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.stderr
rename to src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.min_tait.stderr
index 0b4c262bbb4..20057c3aa51 100644
--- a/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.stderr
+++ b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.min_tait.stderr
@@ -1,11 +1,11 @@
 error: could not find defining uses
-  --> $DIR/declared_but_not_defined_in_scope.rs:7:20
+  --> $DIR/declared_but_not_defined_in_scope.rs:10:20
    |
 LL |     pub type Boo = impl ::std::fmt::Debug;
    |                    ^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0308]: mismatched types
-  --> $DIR/declared_but_not_defined_in_scope.rs:11:5
+  --> $DIR/declared_but_not_defined_in_scope.rs:14:5
    |
 LL |     pub type Boo = impl ::std::fmt::Debug;
    |                    ---------------------- the expected opaque type
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs
index 7ea517eb734..2bbae98db44 100644
--- a/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs
+++ b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses.full_tait.stderr b/src/test/ui/type-alias-impl-trait/different_defining_uses.full_tait.stderr
new file mode 100644
index 00000000000..60fa141884d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/different_defining_uses.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/different_defining_uses.rs:15:1
+   |
+LL | fn bar() -> Foo {
+   | ^^^^^^^^^^^^^^^ expected `&'static str`, got `i32`
+   |
+note: previous use here
+  --> $DIR/different_defining_uses.rs:11:1
+   |
+LL | fn foo() -> Foo {
+   | ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses.stderr b/src/test/ui/type-alias-impl-trait/different_defining_uses.min_tait.stderr
similarity index 75%
rename from src/test/ui/type-alias-impl-trait/different_defining_uses.stderr
rename to src/test/ui/type-alias-impl-trait/different_defining_uses.min_tait.stderr
index eaa716bc71c..904ee58685c 100644
--- a/src/test/ui/type-alias-impl-trait/different_defining_uses.stderr
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses.min_tait.stderr
@@ -1,11 +1,11 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/different_defining_uses.rs:12:1
+  --> $DIR/different_defining_uses.rs:15:1
    |
 LL | fn bar() -> Foo {
    | ^^^^^^^^^^^^^^^ expected `&'static str`, got `i32`
    |
 note: previous use here
-  --> $DIR/different_defining_uses.rs:8:1
+  --> $DIR/different_defining_uses.rs:11:1
    |
 LL | fn foo() -> Foo {
    | ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses.rs b/src/test/ui/type-alias-impl-trait/different_defining_uses.rs
index 2d7780a126c..542de6b62e1 100644
--- a/src/test/ui/type-alias-impl-trait/different_defining_uses.rs
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.full_tait.stderr b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.full_tait.stderr
new file mode 100644
index 00000000000..5c5ae7eadcb
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.full_tait.stderr
@@ -0,0 +1,35 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/different_defining_uses_never_type.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/different_defining_uses_never_type.rs:15:1
+   |
+LL | fn bar() -> Foo {
+   | ^^^^^^^^^^^^^^^ expected `&'static str`, got `()`
+   |
+note: previous use here
+  --> $DIR/different_defining_uses_never_type.rs:11:1
+   |
+LL | fn foo() -> Foo {
+   | ^^^^^^^^^^^^^^^
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/different_defining_uses_never_type.rs:19:1
+   |
+LL | fn boo() -> Foo {
+   | ^^^^^^^^^^^^^^^ expected `&'static str`, got `()`
+   |
+note: previous use here
+  --> $DIR/different_defining_uses_never_type.rs:11:1
+   |
+LL | fn foo() -> Foo {
+   | ^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.stderr b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.min_tait.stderr
similarity index 69%
rename from src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.stderr
rename to src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.min_tait.stderr
index 9a587e4f06e..9cf2c583687 100644
--- a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.stderr
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.min_tait.stderr
@@ -1,23 +1,23 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/different_defining_uses_never_type.rs:12:1
+  --> $DIR/different_defining_uses_never_type.rs:15:1
    |
 LL | fn bar() -> Foo {
    | ^^^^^^^^^^^^^^^ expected `&'static str`, got `()`
    |
 note: previous use here
-  --> $DIR/different_defining_uses_never_type.rs:8:1
+  --> $DIR/different_defining_uses_never_type.rs:11:1
    |
 LL | fn foo() -> Foo {
    | ^^^^^^^^^^^^^^^
 
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/different_defining_uses_never_type.rs:16:1
+  --> $DIR/different_defining_uses_never_type.rs:19:1
    |
 LL | fn boo() -> Foo {
    | ^^^^^^^^^^^^^^^ expected `&'static str`, got `()`
    |
 note: previous use here
-  --> $DIR/different_defining_uses_never_type.rs:8:1
+  --> $DIR/different_defining_uses_never_type.rs:11:1
    |
 LL | fn foo() -> Foo {
    | ^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.rs b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.rs
index 289b97b00ad..72352a74a04 100644
--- a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.rs
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.full_tait.stderr b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.full_tait.stderr
new file mode 100644
index 00000000000..b69622b77bf
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/different_defining_uses_never_type2.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.rs b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.rs
index 8549687ea78..ac9884b3e45 100644
--- a/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.rs
+++ b/src/test/ui/type-alias-impl-trait/different_defining_uses_never_type2.rs
@@ -1,6 +1,9 @@
 // build-pass (FIXME(62277): could be check-pass?)
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/fallback.full_tait.stderr b/src/test/ui/type-alias-impl-trait/fallback.full_tait.stderr
new file mode 100644
index 00000000000..9641d756cb0
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/fallback.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/fallback.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/fallback.rs b/src/test/ui/type-alias-impl-trait/fallback.rs
index fe1ca2230da..84fec75655f 100644
--- a/src/test/ui/type-alias-impl-trait/fallback.rs
+++ b/src/test/ui/type-alias-impl-trait/fallback.rs
@@ -2,7 +2,10 @@
 // inference variable being completely unconstrained.
 //
 // check-pass
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Foo = impl Copy;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.full_tait.stderr
new file mode 100644
index 00000000000..972e5d94288
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_different_defining_uses.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/generic_different_defining_uses.rs:14:1
+   |
+LL | fn my_iter2<T>(t: T) -> MyIter<T> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `std::iter::Once<T>`, got `std::option::IntoIter<T>`
+   |
+note: previous use here
+  --> $DIR/generic_different_defining_uses.rs:10:1
+   |
+LL | fn my_iter<T>(t: T) -> MyIter<T> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.stderr b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.min_tait.stderr
similarity index 78%
rename from src/test/ui/type-alias-impl-trait/generic_different_defining_uses.stderr
rename to src/test/ui/type-alias-impl-trait/generic_different_defining_uses.min_tait.stderr
index f8a058170e3..911683862c2 100644
--- a/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.min_tait.stderr
@@ -1,11 +1,11 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/generic_different_defining_uses.rs:11:1
+  --> $DIR/generic_different_defining_uses.rs:14:1
    |
 LL | fn my_iter2<T>(t: T) -> MyIter<T> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `std::iter::Once<T>`, got `std::option::IntoIter<T>`
    |
 note: previous use here
-  --> $DIR/generic_different_defining_uses.rs:7:1
+  --> $DIR/generic_different_defining_uses.rs:10:1
    |
 LL | fn my_iter<T>(t: T) -> MyIter<T> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs
index ac87c2d446a..4eb603df583 100644
--- a/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.full_tait.stderr
new file mode 100644
index 00000000000..ecf0e39ed6f
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_lifetime_param.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_lifetime_param.rs:10:26
+   |
+LL | fn one<'a>(t: &'a ()) -> Two<'a, 'a> {
+   |                          ^^^^^^^^^^^
+   |
+note: lifetime used multiple times
+  --> $DIR/generic_duplicate_lifetime_param.rs:8:10
+   |
+LL | type Two<'a, 'b> = impl std::fmt::Debug;
+   |          ^^  ^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.min_tait.stderr
similarity index 73%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.min_tait.stderr
index 08b26b8fc13..1aad312056b 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_lifetime_param.rs:7:26
+  --> $DIR/generic_duplicate_lifetime_param.rs:10:26
    |
 LL | fn one<'a>(t: &'a ()) -> Two<'a, 'a> {
    |                          ^^^^^^^^^^^
    |
 note: lifetime used multiple times
-  --> $DIR/generic_duplicate_lifetime_param.rs:5:10
+  --> $DIR/generic_duplicate_lifetime_param.rs:8:10
    |
 LL | type Two<'a, 'b> = impl std::fmt::Debug;
    |          ^^  ^^
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.rs
index c18a7116758..d838d497238 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_lifetime_param.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.full_tait.stderr
similarity index 76%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.full_tait.stderr
index b4757e2763d..805cea7127d 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.full_tait.stderr
@@ -1,35 +1,35 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_param_use.rs:13:30
+  --> $DIR/generic_duplicate_param_use.rs:16:30
    |
 LL | fn one_ty<T: Debug>(t: T) -> TwoTys<T, T> {
    |                              ^^^^^^^^^^^^
    |
 note: type used multiple times
-  --> $DIR/generic_duplicate_param_use.rs:9:13
+  --> $DIR/generic_duplicate_param_use.rs:12:13
    |
 LL | type TwoTys<T, U> = impl Debug;
    |             ^  ^
 
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_param_use.rs:18:36
+  --> $DIR/generic_duplicate_param_use.rs:21:36
    |
 LL | fn one_lifetime<'a>(t: &'a u32) -> TwoLifetimes<'a, 'a> {
    |                                    ^^^^^^^^^^^^^^^^^^^^
    |
 note: lifetime used multiple times
-  --> $DIR/generic_duplicate_param_use.rs:10:19
+  --> $DIR/generic_duplicate_param_use.rs:13:19
    |
 LL | type TwoLifetimes<'a, 'b> = impl Debug;
    |                   ^^  ^^
 
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_param_use.rs:23:50
+  --> $DIR/generic_duplicate_param_use.rs:26:50
    |
 LL | fn one_const<const N: usize>(t: *mut [u8; N]) -> TwoConsts<N, N> {
    |                                                  ^^^^^^^^^^^^^^^
    |
 note: constant used multiple times
-  --> $DIR/generic_duplicate_param_use.rs:11:22
+  --> $DIR/generic_duplicate_param_use.rs:14:22
    |
 LL | type TwoConsts<const X: usize, const Y: usize> = impl Debug;
    |                      ^               ^
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.min_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.min_tait.stderr
new file mode 100644
index 00000000000..805cea7127d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.min_tait.stderr
@@ -0,0 +1,38 @@
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_param_use.rs:16:30
+   |
+LL | fn one_ty<T: Debug>(t: T) -> TwoTys<T, T> {
+   |                              ^^^^^^^^^^^^
+   |
+note: type used multiple times
+  --> $DIR/generic_duplicate_param_use.rs:12:13
+   |
+LL | type TwoTys<T, U> = impl Debug;
+   |             ^  ^
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_param_use.rs:21:36
+   |
+LL | fn one_lifetime<'a>(t: &'a u32) -> TwoLifetimes<'a, 'a> {
+   |                                    ^^^^^^^^^^^^^^^^^^^^
+   |
+note: lifetime used multiple times
+  --> $DIR/generic_duplicate_param_use.rs:13:19
+   |
+LL | type TwoLifetimes<'a, 'b> = impl Debug;
+   |                   ^^  ^^
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_param_use.rs:26:50
+   |
+LL | fn one_const<const N: usize>(t: *mut [u8; N]) -> TwoConsts<N, N> {
+   |                                                  ^^^^^^^^^^^^^^^
+   |
+note: constant used multiple times
+  --> $DIR/generic_duplicate_param_use.rs:14:22
+   |
+LL | type TwoConsts<const X: usize, const Y: usize> = impl Debug;
+   |                      ^               ^
+
+error: aborting due to 3 previous errors
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.rs
index 4503607a836..12ff5a2e713 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait, const_generics)]
+#![feature(const_generics)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
 #![allow(incomplete_features)]
 
 use std::fmt::Debug;
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.full_tait.stderr
new file mode 100644
index 00000000000..ef7d4f1be4e
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use10.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.rs
index c17d595dbb3..c7a7ded2127 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use10.rs
@@ -1,5 +1,8 @@
 // check-pass
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.full_tait.stderr
new file mode 100644
index 00000000000..357d477c9f1
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use2.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_param_use2.rs:13:27
+   |
+LL | fn one<T: Debug>(t: T) -> Two<T, T> {
+   |                           ^^^^^^^^^
+   |
+note: type used multiple times
+  --> $DIR/generic_duplicate_param_use2.rs:11:10
+   |
+LL | type Two<T, U> = impl Debug;
+   |          ^  ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.min_tait.stderr
similarity index 73%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.min_tait.stderr
index 711de855f0d..805ab67816f 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_param_use3.rs:10:27
+  --> $DIR/generic_duplicate_param_use2.rs:13:27
    |
 LL | fn one<T: Debug>(t: T) -> Two<T, T> {
    |                           ^^^^^^^^^
    |
 note: type used multiple times
-  --> $DIR/generic_duplicate_param_use3.rs:8:10
+  --> $DIR/generic_duplicate_param_use2.rs:11:10
    |
 LL | type Two<T, U> = impl Debug;
    |          ^  ^
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.rs
index a74731df695..ff516622823 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.full_tait.stderr
new file mode 100644
index 00000000000..b2004c8416c
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use3.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_param_use3.rs:13:27
+   |
+LL | fn one<T: Debug>(t: T) -> Two<T, T> {
+   |                           ^^^^^^^^^
+   |
+note: type used multiple times
+  --> $DIR/generic_duplicate_param_use3.rs:11:10
+   |
+LL | type Two<T, U> = impl Debug;
+   |          ^  ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.min_tait.stderr
similarity index 73%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.min_tait.stderr
index fcf01f5164a..43af9eca63e 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_param_use4.rs:10:27
+  --> $DIR/generic_duplicate_param_use3.rs:13:27
    |
 LL | fn one<T: Debug>(t: T) -> Two<T, T> {
    |                           ^^^^^^^^^
    |
 note: type used multiple times
-  --> $DIR/generic_duplicate_param_use4.rs:8:10
+  --> $DIR/generic_duplicate_param_use3.rs:11:10
    |
 LL | type Two<T, U> = impl Debug;
    |          ^  ^
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.rs
index 0597b8385d2..f7d1cc1ad4e 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.full_tait.stderr
new file mode 100644
index 00000000000..f5db77a08d7
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use4.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_duplicate_param_use4.rs:13:27
+   |
+LL | fn one<T: Debug>(t: T) -> Two<T, T> {
+   |                           ^^^^^^^^^
+   |
+note: type used multiple times
+  --> $DIR/generic_duplicate_param_use4.rs:11:10
+   |
+LL | type Two<T, U> = impl Debug;
+   |          ^  ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.min_tait.stderr
similarity index 73%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.min_tait.stderr
index d87e8c5783b..f8e2b510460 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use2.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_duplicate_param_use2.rs:10:27
+  --> $DIR/generic_duplicate_param_use4.rs:13:27
    |
 LL | fn one<T: Debug>(t: T) -> Two<T, T> {
    |                           ^^^^^^^^^
    |
 note: type used multiple times
-  --> $DIR/generic_duplicate_param_use2.rs:8:10
+  --> $DIR/generic_duplicate_param_use4.rs:11:10
    |
 LL | type Two<T, U> = impl Debug;
    |          ^  ^
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.rs
index 40388c3b6c8..26583a6ce9b 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use4.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.full_tait.stderr
new file mode 100644
index 00000000000..8a0c411c775
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.full_tait.stderr
@@ -0,0 +1,48 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use5.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/generic_duplicate_param_use5.rs:19:1
+   |
+LL | fn three<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(T, U)`, got `(U, T)`
+   |
+note: previous use here
+  --> $DIR/generic_duplicate_param_use5.rs:15:1
+   |
+LL | fn two<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: `T` doesn't implement `Debug`
+  --> $DIR/generic_duplicate_param_use5.rs:11:18
+   |
+LL | type Two<T, U> = impl Debug;
+   |                  ^^^^^^^^^^ `T` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+   = note: required because of the requirements on the impl of `Debug` for `(T, U)`
+help: consider restricting type parameter `T`
+   |
+LL | type Two<T: Debug, U> = impl Debug;
+   |           ^^^^^^^
+
+error[E0277]: `U` doesn't implement `Debug`
+  --> $DIR/generic_duplicate_param_use5.rs:11:18
+   |
+LL | type Two<T, U> = impl Debug;
+   |                  ^^^^^^^^^^ `U` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+   = note: required because of the requirements on the impl of `Debug` for `(T, U)`
+help: consider restricting type parameter `U`
+   |
+LL | type Two<T, U: Debug> = impl Debug;
+   |              ^^^^^^^
+
+error: aborting due to 3 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.min_tait.stderr
similarity index 86%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.min_tait.stderr
index b4aed4a6323..35115ccb2d6 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.min_tait.stderr
@@ -1,17 +1,17 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/generic_duplicate_param_use5.rs:16:1
+  --> $DIR/generic_duplicate_param_use5.rs:19:1
    |
 LL | fn three<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(T, U)`, got `(U, T)`
    |
 note: previous use here
-  --> $DIR/generic_duplicate_param_use5.rs:12:1
+  --> $DIR/generic_duplicate_param_use5.rs:15:1
    |
 LL | fn two<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0277]: `T` doesn't implement `Debug`
-  --> $DIR/generic_duplicate_param_use5.rs:8:18
+  --> $DIR/generic_duplicate_param_use5.rs:11:18
    |
 LL | type Two<T, U> = impl Debug;
    |                  ^^^^^^^^^^ `T` cannot be formatted using `{:?}` because it doesn't implement `Debug`
@@ -23,7 +23,7 @@ LL | type Two<T: Debug, U> = impl Debug;
    |           ^^^^^^^
 
 error[E0277]: `U` doesn't implement `Debug`
-  --> $DIR/generic_duplicate_param_use5.rs:8:18
+  --> $DIR/generic_duplicate_param_use5.rs:11:18
    |
 LL | type Two<T, U> = impl Debug;
    |                  ^^^^^^^^^^ `U` cannot be formatted using `{:?}` because it doesn't implement `Debug`
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.rs
index dd2f202cf5d..af473e8245a 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use5.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.full_tait.stderr
new file mode 100644
index 00000000000..8f72c333e81
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.full_tait.stderr
@@ -0,0 +1,36 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use6.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/generic_duplicate_param_use6.rs:18:1
+   |
+LL | fn three<T: Copy + Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(T, T)`, got `(U, T)`
+   |
+note: previous use here
+  --> $DIR/generic_duplicate_param_use6.rs:14:1
+   |
+LL | fn two<T: Copy + Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: `T` doesn't implement `Debug`
+  --> $DIR/generic_duplicate_param_use6.rs:11:18
+   |
+LL | type Two<T, U> = impl Debug;
+   |                  ^^^^^^^^^^ `T` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+   = note: required because of the requirements on the impl of `Debug` for `(T, T)`
+help: consider restricting type parameter `T`
+   |
+LL | type Two<T: Debug, U> = impl Debug;
+   |           ^^^^^^^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.min_tait.stderr
similarity index 86%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.min_tait.stderr
index 22e4d006674..922c9a74208 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.min_tait.stderr
@@ -1,17 +1,17 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/generic_duplicate_param_use6.rs:15:1
+  --> $DIR/generic_duplicate_param_use6.rs:18:1
    |
 LL | fn three<T: Copy + Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(T, T)`, got `(U, T)`
    |
 note: previous use here
-  --> $DIR/generic_duplicate_param_use6.rs:11:1
+  --> $DIR/generic_duplicate_param_use6.rs:14:1
    |
 LL | fn two<T: Copy + Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0277]: `T` doesn't implement `Debug`
-  --> $DIR/generic_duplicate_param_use6.rs:8:18
+  --> $DIR/generic_duplicate_param_use6.rs:11:18
    |
 LL | type Two<T, U> = impl Debug;
    |                  ^^^^^^^^^^ `T` cannot be formatted using `{:?}` because it doesn't implement `Debug`
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.rs
index d54d3cd62e0..01afb2f4496 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.full_tait.stderr
new file mode 100644
index 00000000000..d80c8326ad6
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use7.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.rs
index feebf81eef2..184e3a5f926 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use7.rs
@@ -1,5 +1,8 @@
 // check-pass
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.full_tait.stderr
new file mode 100644
index 00000000000..a93321d4d05
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.full_tait.stderr
@@ -0,0 +1,36 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use8.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/generic_duplicate_param_use8.rs:17:1
+   |
+LL | fn three<T: Debug, U: Debug>(_: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(T, u32)`, got `(U, u32)`
+   |
+note: previous use here
+  --> $DIR/generic_duplicate_param_use8.rs:13:1
+   |
+LL | fn two<T: Debug, U: Debug>(t: T, _: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: `T` doesn't implement `Debug`
+  --> $DIR/generic_duplicate_param_use8.rs:10:18
+   |
+LL | type Two<T, U> = impl Debug;
+   |                  ^^^^^^^^^^ `T` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+   = note: required because of the requirements on the impl of `Debug` for `(T, u32)`
+help: consider restricting type parameter `T`
+   |
+LL | type Two<T: Debug, U> = impl Debug;
+   |           ^^^^^^^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.min_tait.stderr
similarity index 85%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.min_tait.stderr
index 82da704c9ee..25ac60799f6 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.min_tait.stderr
@@ -1,17 +1,17 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/generic_duplicate_param_use8.rs:14:1
+  --> $DIR/generic_duplicate_param_use8.rs:17:1
    |
 LL | fn three<T: Debug, U: Debug>(_: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(T, u32)`, got `(U, u32)`
    |
 note: previous use here
-  --> $DIR/generic_duplicate_param_use8.rs:10:1
+  --> $DIR/generic_duplicate_param_use8.rs:13:1
    |
 LL | fn two<T: Debug, U: Debug>(t: T, _: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0277]: `T` doesn't implement `Debug`
-  --> $DIR/generic_duplicate_param_use8.rs:7:18
+  --> $DIR/generic_duplicate_param_use8.rs:10:18
    |
 LL | type Two<T, U> = impl Debug;
    |                  ^^^^^^^^^^ `T` cannot be formatted using `{:?}` because it doesn't implement `Debug`
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs
index 4a723b64cdc..ecb8b2cedb4 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.full_tait.stderr
new file mode 100644
index 00000000000..098be7929d6
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.full_tait.stderr
@@ -0,0 +1,60 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_duplicate_param_use9.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/generic_duplicate_param_use9.rs:24:1
+   |
+LL | fn three<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(A, B, <A as Foo>::Bar)`, got `(A, B, i32)`
+   |
+note: previous use here
+  --> $DIR/generic_duplicate_param_use9.rs:20:1
+   |
+LL | fn two<T: Debug + Foo, U: Debug>(t: T, u: U) -> Two<T, U> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: the trait bound `A: Foo` is not satisfied in `(A, B, <A as Foo>::Bar)`
+  --> $DIR/generic_duplicate_param_use9.rs:10:18
+   |
+LL | type Two<A, B> = impl Debug;
+   |                  ^^^^^^^^^^ within `(A, B, <A as Foo>::Bar)`, the trait `Foo` is not implemented for `A`
+   |
+   = note: required because it appears within the type `(A, B, <A as Foo>::Bar)`
+help: consider restricting type parameter `A`
+   |
+LL | type Two<A: Foo, B> = impl Debug;
+   |           ^^^^^
+
+error[E0277]: `A` doesn't implement `Debug`
+  --> $DIR/generic_duplicate_param_use9.rs:10:18
+   |
+LL | type Two<A, B> = impl Debug;
+   |                  ^^^^^^^^^^ `A` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+   = note: required because of the requirements on the impl of `Debug` for `(A, B, <A as Foo>::Bar)`
+help: consider restricting type parameter `A`
+   |
+LL | type Two<A: Debug, B> = impl Debug;
+   |           ^^^^^^^
+
+error[E0277]: `B` doesn't implement `Debug`
+  --> $DIR/generic_duplicate_param_use9.rs:10:18
+   |
+LL | type Two<A, B> = impl Debug;
+   |                  ^^^^^^^^^^ `B` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+   = note: required because of the requirements on the impl of `Debug` for `(A, B, <A as Foo>::Bar)`
+help: consider restricting type parameter `B`
+   |
+LL | type Two<A, B: Debug> = impl Debug;
+   |              ^^^^^^^
+
+error: aborting due to 4 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.stderr b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.min_tait.stderr
similarity index 87%
rename from src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.stderr
rename to src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.min_tait.stderr
index 63aa0f8a81c..b59e10c1b06 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.min_tait.stderr
@@ -1,17 +1,17 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/generic_duplicate_param_use9.rs:21:1
+  --> $DIR/generic_duplicate_param_use9.rs:24:1
    |
 LL | fn three<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `(A, B, <A as Foo>::Bar)`, got `(A, B, i32)`
    |
 note: previous use here
-  --> $DIR/generic_duplicate_param_use9.rs:17:1
+  --> $DIR/generic_duplicate_param_use9.rs:20:1
    |
 LL | fn two<T: Debug + Foo, U: Debug>(t: T, u: U) -> Two<T, U> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0277]: the trait bound `A: Foo` is not satisfied in `(A, B, <A as Foo>::Bar)`
-  --> $DIR/generic_duplicate_param_use9.rs:7:18
+  --> $DIR/generic_duplicate_param_use9.rs:10:18
    |
 LL | type Two<A, B> = impl Debug;
    |                  ^^^^^^^^^^ within `(A, B, <A as Foo>::Bar)`, the trait `Foo` is not implemented for `A`
@@ -23,7 +23,7 @@ LL | type Two<A: Foo, B> = impl Debug;
    |           ^^^^^
 
 error[E0277]: `A` doesn't implement `Debug`
-  --> $DIR/generic_duplicate_param_use9.rs:7:18
+  --> $DIR/generic_duplicate_param_use9.rs:10:18
    |
 LL | type Two<A, B> = impl Debug;
    |                  ^^^^^^^^^^ `A` cannot be formatted using `{:?}` because it doesn't implement `Debug`
@@ -35,7 +35,7 @@ LL | type Two<A: Debug, B> = impl Debug;
    |           ^^^^^^^
 
 error[E0277]: `B` doesn't implement `Debug`
-  --> $DIR/generic_duplicate_param_use9.rs:7:18
+  --> $DIR/generic_duplicate_param_use9.rs:10:18
    |
 LL | type Two<A, B> = impl Debug;
    |                  ^^^^^^^^^^ `B` cannot be formatted using `{:?}` because it doesn't implement `Debug`
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs
index 74708193317..5eced6cfa5a 100644
--- a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_lifetime_param.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_lifetime_param.full_tait.stderr
new file mode 100644
index 00000000000..39817757f18
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_lifetime_param.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_lifetime_param.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_lifetime_param.rs b/src/test/ui/type-alias-impl-trait/generic_lifetime_param.rs
index e109c38c986..dbe7cfd1c81 100644
--- a/src/test/ui/type-alias-impl-trait/generic_lifetime_param.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_lifetime_param.rs
@@ -1,6 +1,9 @@
 // build-pass (FIXME(62277): could be check-pass?)
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_nondefining_use.stderr b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.full_tait.stderr
similarity index 80%
rename from src/test/ui/type-alias-impl-trait/generic_nondefining_use.stderr
rename to src/test/ui/type-alias-impl-trait/generic_nondefining_use.full_tait.stderr
index 88f8dbe1a7d..4d7eddfb2fb 100644
--- a/src/test/ui/type-alias-impl-trait/generic_nondefining_use.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.full_tait.stderr
@@ -1,17 +1,17 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_nondefining_use.rs:14:21
+  --> $DIR/generic_nondefining_use.rs:17:21
    |
 LL | fn concrete_ty() -> OneTy<u32> {
    |                     ^^^^^^^^^^
    |
 note: used non-generic type `u32` for generic parameter
-  --> $DIR/generic_nondefining_use.rs:8:12
+  --> $DIR/generic_nondefining_use.rs:11:12
    |
 LL | type OneTy<T> = impl Debug;
    |            ^
 
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_nondefining_use.rs:19:27
+  --> $DIR/generic_nondefining_use.rs:22:27
    |
 LL | type OneLifetime<'a> = impl Debug;
    |                  -- cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
@@ -20,13 +20,13 @@ LL | fn concrete_lifetime() -> OneLifetime<'static> {
    |                           ^^^^^^^^^^^^^^^^^^^^
 
 error: non-defining opaque type use in defining scope
-  --> $DIR/generic_nondefining_use.rs:24:24
+  --> $DIR/generic_nondefining_use.rs:27:24
    |
 LL | fn concrete_const() -> OneConst<{123}> {
    |                        ^^^^^^^^^^^^^^^
    |
 note: used non-generic constant `{123}` for generic parameter
-  --> $DIR/generic_nondefining_use.rs:10:21
+  --> $DIR/generic_nondefining_use.rs:13:21
    |
 LL | type OneConst<const X: usize> = impl Debug;
    |                     ^
diff --git a/src/test/ui/type-alias-impl-trait/generic_nondefining_use.min_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.min_tait.stderr
new file mode 100644
index 00000000000..4d7eddfb2fb
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.min_tait.stderr
@@ -0,0 +1,35 @@
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_nondefining_use.rs:17:21
+   |
+LL | fn concrete_ty() -> OneTy<u32> {
+   |                     ^^^^^^^^^^
+   |
+note: used non-generic type `u32` for generic parameter
+  --> $DIR/generic_nondefining_use.rs:11:12
+   |
+LL | type OneTy<T> = impl Debug;
+   |            ^
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_nondefining_use.rs:22:27
+   |
+LL | type OneLifetime<'a> = impl Debug;
+   |                  -- cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
+...
+LL | fn concrete_lifetime() -> OneLifetime<'static> {
+   |                           ^^^^^^^^^^^^^^^^^^^^
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/generic_nondefining_use.rs:27:24
+   |
+LL | fn concrete_const() -> OneConst<{123}> {
+   |                        ^^^^^^^^^^^^^^^
+   |
+note: used non-generic constant `{123}` for generic parameter
+  --> $DIR/generic_nondefining_use.rs:13:21
+   |
+LL | type OneConst<const X: usize> = impl Debug;
+   |                     ^
+
+error: aborting due to 3 previous errors
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs
index b1782120f84..c69884d8d6e 100644
--- a/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait, const_generics)]
+#![feature(const_generics)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
 #![allow(incomplete_features)]
 
 use std::fmt::Debug;
diff --git a/src/test/ui/type-alias-impl-trait/generic_not_used.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_not_used.full_tait.stderr
new file mode 100644
index 00000000000..819ef7b7712
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_not_used.full_tait.stderr
@@ -0,0 +1,27 @@
+error: at least one trait must be specified
+  --> $DIR/generic_not_used.rs:8:33
+   |
+LL | type WrongGeneric<T: 'static> = impl 'static;
+   |                                 ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_not_used.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: type parameter `V` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+  --> $DIR/generic_not_used.rs:11:73
+   |
+LL |   fn wrong_generic<U: 'static, V: 'static>(_: U, v: V) -> WrongGeneric<U> {
+   |  _________________________________________________________________________^
+LL | |
+LL | |     v
+LL | | }
+   | |_^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/generic_not_used.stderr b/src/test/ui/type-alias-impl-trait/generic_not_used.min_tait.stderr
similarity index 87%
rename from src/test/ui/type-alias-impl-trait/generic_not_used.stderr
rename to src/test/ui/type-alias-impl-trait/generic_not_used.min_tait.stderr
index 8015ff7eded..fe7f5f6c71e 100644
--- a/src/test/ui/type-alias-impl-trait/generic_not_used.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_not_used.min_tait.stderr
@@ -1,11 +1,11 @@
 error: at least one trait must be specified
-  --> $DIR/generic_not_used.rs:5:33
+  --> $DIR/generic_not_used.rs:8:33
    |
 LL | type WrongGeneric<T: 'static> = impl 'static;
    |                                 ^^^^^^^^^^^^
 
 error: type parameter `V` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-  --> $DIR/generic_not_used.rs:8:73
+  --> $DIR/generic_not_used.rs:11:73
    |
 LL |   fn wrong_generic<U: 'static, V: 'static>(_: U, v: V) -> WrongGeneric<U> {
    |  _________________________________________________________________________^
diff --git a/src/test/ui/type-alias-impl-trait/generic_not_used.rs b/src/test/ui/type-alias-impl-trait/generic_not_used.rs
index ace52dc83ad..68f50b2151f 100644
--- a/src/test/ui/type-alias-impl-trait/generic_not_used.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_not_used.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.full_tait.stderr
new file mode 100644
index 00000000000..6394a1f8e85
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.full_tait.stderr
@@ -0,0 +1,51 @@
+error: at least one trait must be specified
+  --> $DIR/generic_type_does_not_live_long_enough.rs:12:24
+   |
+LL | type WrongGeneric<T> = impl 'static;
+   |                        ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_type_does_not_live_long_enough.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0308]: mismatched types
+  --> $DIR/generic_type_does_not_live_long_enough.rs:9:18
+   |
+LL |     let z: i32 = x;
+   |            ---   ^ expected `i32`, found opaque type
+   |            |
+   |            expected due to this
+...
+LL | type WrongGeneric<T> = impl 'static;
+   |                        ------------ the found opaque type
+   |
+   = note:     expected type `i32`
+           found opaque type `impl Sized`
+
+error[E0310]: the parameter type `T` may not live long enough
+  --> $DIR/generic_type_does_not_live_long_enough.rs:12:24
+   |
+LL | type WrongGeneric<T> = impl 'static;
+   |                        ^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
+...
+LL | fn wrong_generic<T>(t: T) -> WrongGeneric<T> {
+   |                  - help: consider adding an explicit lifetime bound...: `T: 'static`
+
+error[E0310]: the parameter type `T` may not live long enough
+  --> $DIR/generic_type_does_not_live_long_enough.rs:12:24
+   |
+LL | type WrongGeneric<T> = impl 'static;
+   |                        ^^^^^^^^^^^^
+   |
+   = help: consider adding an explicit lifetime bound `T: 'static`...
+   = note: ...so that the type `T` will meet its required lifetime bounds
+
+error: aborting due to 4 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0308, E0310.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.stderr b/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.min_tait.stderr
similarity index 84%
rename from src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.stderr
rename to src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.min_tait.stderr
index 4924c447d7e..49ead8b094c 100644
--- a/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.min_tait.stderr
@@ -1,11 +1,11 @@
 error: at least one trait must be specified
-  --> $DIR/generic_type_does_not_live_long_enough.rs:9:24
+  --> $DIR/generic_type_does_not_live_long_enough.rs:12:24
    |
 LL | type WrongGeneric<T> = impl 'static;
    |                        ^^^^^^^^^^^^
 
 error[E0308]: mismatched types
-  --> $DIR/generic_type_does_not_live_long_enough.rs:6:18
+  --> $DIR/generic_type_does_not_live_long_enough.rs:9:18
    |
 LL |     let z: i32 = x;
    |            ---   ^ expected `i32`, found opaque type
@@ -19,7 +19,7 @@ LL | type WrongGeneric<T> = impl 'static;
            found opaque type `impl Sized`
 
 error[E0310]: the parameter type `T` may not live long enough
-  --> $DIR/generic_type_does_not_live_long_enough.rs:9:24
+  --> $DIR/generic_type_does_not_live_long_enough.rs:12:24
    |
 LL | type WrongGeneric<T> = impl 'static;
    |                        ^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
@@ -28,7 +28,7 @@ LL | fn wrong_generic<T>(t: T) -> WrongGeneric<T> {
    |                  - help: consider adding an explicit lifetime bound...: `T: 'static`
 
 error[E0310]: the parameter type `T` may not live long enough
-  --> $DIR/generic_type_does_not_live_long_enough.rs:9:24
+  --> $DIR/generic_type_does_not_live_long_enough.rs:12:24
    |
 LL | type WrongGeneric<T> = impl 'static;
    |                        ^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.rs b/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.rs
index f6d49096036..3dda34ff668 100644
--- a/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {
     let y = 42;
diff --git a/src/test/ui/type-alias-impl-trait/generic_underconstrained.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_underconstrained.full_tait.stderr
new file mode 100644
index 00000000000..c4778a46fb0
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_underconstrained.full_tait.stderr
@@ -0,0 +1,32 @@
+error: at least one trait must be specified
+  --> $DIR/generic_underconstrained.rs:9:35
+   |
+LL | type Underconstrained<T: Trait> = impl 'static;
+   |                                   ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_underconstrained.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0277]: the trait bound `T: Trait` is not satisfied
+  --> $DIR/generic_underconstrained.rs:13:31
+   |
+LL | type Underconstrained<T: Trait> = impl 'static;
+   |                          ----- required by this bound in `Underconstrained`
+...
+LL | fn underconstrain<T>(_: T) -> Underconstrained<T> {
+   |                               ^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `T`
+   |
+help: consider restricting type parameter `T`
+   |
+LL | fn underconstrain<T: Trait>(_: T) -> Underconstrained<T> {
+   |                    ^^^^^^^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_underconstrained.stderr b/src/test/ui/type-alias-impl-trait/generic_underconstrained.min_tait.stderr
similarity index 89%
rename from src/test/ui/type-alias-impl-trait/generic_underconstrained.stderr
rename to src/test/ui/type-alias-impl-trait/generic_underconstrained.min_tait.stderr
index cefc5d99b37..6c1d6debee8 100644
--- a/src/test/ui/type-alias-impl-trait/generic_underconstrained.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_underconstrained.min_tait.stderr
@@ -1,11 +1,11 @@
 error: at least one trait must be specified
-  --> $DIR/generic_underconstrained.rs:6:35
+  --> $DIR/generic_underconstrained.rs:9:35
    |
 LL | type Underconstrained<T: Trait> = impl 'static;
    |                                   ^^^^^^^^^^^^
 
 error[E0277]: the trait bound `T: Trait` is not satisfied
-  --> $DIR/generic_underconstrained.rs:10:31
+  --> $DIR/generic_underconstrained.rs:13:31
    |
 LL | type Underconstrained<T: Trait> = impl 'static;
    |                          ----- required by this bound in `Underconstrained`
diff --git a/src/test/ui/type-alias-impl-trait/generic_underconstrained.rs b/src/test/ui/type-alias-impl-trait/generic_underconstrained.rs
index 766ee36c02b..f4c4a1b72cb 100644
--- a/src/test/ui/type-alias-impl-trait/generic_underconstrained.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_underconstrained.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/generic_underconstrained2.full_tait.stderr b/src/test/ui/type-alias-impl-trait/generic_underconstrained2.full_tait.stderr
new file mode 100644
index 00000000000..ca263ba4f5b
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_underconstrained2.full_tait.stderr
@@ -0,0 +1,52 @@
+error: at least one trait must be specified
+  --> $DIR/generic_underconstrained2.rs:8:45
+   |
+LL | type Underconstrained<T: std::fmt::Debug> = impl 'static;
+   |                                             ^^^^^^^^^^^^
+
+error: at least one trait must be specified
+  --> $DIR/generic_underconstrained2.rs:17:46
+   |
+LL | type Underconstrained2<T: std::fmt::Debug> = impl 'static;
+   |                                              ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/generic_underconstrained2.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0277]: `U` doesn't implement `Debug`
+  --> $DIR/generic_underconstrained2.rs:12:33
+   |
+LL | type Underconstrained<T: std::fmt::Debug> = impl 'static;
+   |                          --------------- required by this bound in `Underconstrained`
+...
+LL | fn underconstrained<U>(_: U) -> Underconstrained<U> {
+   |                                 ^^^^^^^^^^^^^^^^^^^ `U` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+help: consider restricting type parameter `U`
+   |
+LL | fn underconstrained<U: Debug>(_: U) -> Underconstrained<U> {
+   |                      ^^^^^^^
+
+error[E0277]: `V` doesn't implement `Debug`
+  --> $DIR/generic_underconstrained2.rs:21:43
+   |
+LL | type Underconstrained2<T: std::fmt::Debug> = impl 'static;
+   |                           --------------- required by this bound in `Underconstrained2`
+...
+LL | fn underconstrained2<U, V>(_: U, _: V) -> Underconstrained2<V> {
+   |                                           ^^^^^^^^^^^^^^^^^^^^ `V` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |
+help: consider restricting type parameter `V`
+   |
+LL | fn underconstrained2<U, V: Debug>(_: U, _: V) -> Underconstrained2<V> {
+   |                          ^^^^^^^
+
+error: aborting due to 4 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/generic_underconstrained2.stderr b/src/test/ui/type-alias-impl-trait/generic_underconstrained2.min_tait.stderr
similarity index 89%
rename from src/test/ui/type-alias-impl-trait/generic_underconstrained2.stderr
rename to src/test/ui/type-alias-impl-trait/generic_underconstrained2.min_tait.stderr
index 669546aef86..6ce32f457e3 100644
--- a/src/test/ui/type-alias-impl-trait/generic_underconstrained2.stderr
+++ b/src/test/ui/type-alias-impl-trait/generic_underconstrained2.min_tait.stderr
@@ -1,17 +1,17 @@
 error: at least one trait must be specified
-  --> $DIR/generic_underconstrained2.rs:5:45
+  --> $DIR/generic_underconstrained2.rs:8:45
    |
 LL | type Underconstrained<T: std::fmt::Debug> = impl 'static;
    |                                             ^^^^^^^^^^^^
 
 error: at least one trait must be specified
-  --> $DIR/generic_underconstrained2.rs:14:46
+  --> $DIR/generic_underconstrained2.rs:17:46
    |
 LL | type Underconstrained2<T: std::fmt::Debug> = impl 'static;
    |                                              ^^^^^^^^^^^^
 
 error[E0277]: `U` doesn't implement `Debug`
-  --> $DIR/generic_underconstrained2.rs:9:33
+  --> $DIR/generic_underconstrained2.rs:12:33
    |
 LL | type Underconstrained<T: std::fmt::Debug> = impl 'static;
    |                          --------------- required by this bound in `Underconstrained`
@@ -25,7 +25,7 @@ LL | fn underconstrained<U: Debug>(_: U) -> Underconstrained<U> {
    |                      ^^^^^^^
 
 error[E0277]: `V` doesn't implement `Debug`
-  --> $DIR/generic_underconstrained2.rs:18:43
+  --> $DIR/generic_underconstrained2.rs:21:43
    |
 LL | type Underconstrained2<T: std::fmt::Debug> = impl 'static;
    |                           --------------- required by this bound in `Underconstrained2`
diff --git a/src/test/ui/type-alias-impl-trait/generic_underconstrained2.rs b/src/test/ui/type-alias-impl-trait/generic_underconstrained2.rs
index cd7c962e2d1..b3fb0748d2a 100644
--- a/src/test/ui/type-alias-impl-trait/generic_underconstrained2.rs
+++ b/src/test/ui/type-alias-impl-trait/generic_underconstrained2.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.full_tait.stderr b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.full_tait.stderr
new file mode 100644
index 00000000000..bdd88134290
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.full_tait.stderr
@@ -0,0 +1,18 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/impl-with-unconstrained-param.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/impl-with-unconstrained-param.rs:14:6
+   |
+LL | impl<T> X for () {
+   |      ^ unconstrained type parameter
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0207`.
diff --git a/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.stderr b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.min_tait.stderr
similarity index 85%
rename from src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.stderr
rename to src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.min_tait.stderr
index 8cf8fb1d16c..eb59766b913 100644
--- a/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.stderr
+++ b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/impl-with-unconstrained-param.rs:11:6
+  --> $DIR/impl-with-unconstrained-param.rs:14:6
    |
 LL | impl<T> X for () {
    |      ^ unconstrained type parameter
diff --git a/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs
index 851c2f66c47..1aefa2474ff 100644
--- a/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs
+++ b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs
@@ -1,7 +1,10 @@
 // Ensure that we don't ICE if associated type impl trait is used in an impl
 // with an unconstrained type parameter.
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait X {
     type I;
diff --git a/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.full_tait.stderr b/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.full_tait.stderr
new file mode 100644
index 00000000000..30521b8bf7d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.full_tait.stderr
@@ -0,0 +1,32 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/incoherent-assoc-imp-trait.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0119]: conflicting implementations of trait `std::ops::FnOnce<()>` for type `&_`:
+  --> $DIR/incoherent-assoc-imp-trait.rs:13:1
+   |
+LL | impl<F> FnOnce<()> for &F {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: conflicting implementation in crate `core`:
+           - impl<A, F> FnOnce<A> for &F
+             where F: Fn<A>, F: ?Sized;
+
+error[E0210]: type parameter `F` must be used as the type parameter for some local type (e.g., `MyStruct<F>`)
+  --> $DIR/incoherent-assoc-imp-trait.rs:13:6
+   |
+LL | impl<F> FnOnce<()> for &F {
+   |      ^ type parameter `F` must be used as the type parameter for some local type
+   |
+   = note: implementing a foreign trait is only possible if at least one of the types for which it is implemented is local
+   = note: only traits defined in the current crate can be implemented for a type parameter
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0119, E0210.
+For more information about an error, try `rustc --explain E0119`.
diff --git a/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.stderr b/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.min_tait.stderr
similarity index 90%
rename from src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.stderr
rename to src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.min_tait.stderr
index eafbd2ad072..a0427624ec3 100644
--- a/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.stderr
+++ b/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0119]: conflicting implementations of trait `std::ops::FnOnce<()>` for type `&_`:
-  --> $DIR/incoherent-assoc-imp-trait.rs:10:1
+  --> $DIR/incoherent-assoc-imp-trait.rs:13:1
    |
 LL | impl<F> FnOnce<()> for &F {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -9,7 +9,7 @@ LL | impl<F> FnOnce<()> for &F {
              where F: Fn<A>, F: ?Sized;
 
 error[E0210]: type parameter `F` must be used as the type parameter for some local type (e.g., `MyStruct<F>`)
-  --> $DIR/incoherent-assoc-imp-trait.rs:10:6
+  --> $DIR/incoherent-assoc-imp-trait.rs:13:6
    |
 LL | impl<F> FnOnce<()> for &F {
    |      ^ type parameter `F` must be used as the type parameter for some local type
diff --git a/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.rs b/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.rs
index c46c4715924..b52b9c18f08 100644
--- a/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.rs
+++ b/src/test/ui/type-alias-impl-trait/incoherent-assoc-imp-trait.rs
@@ -1,7 +1,10 @@
 // Regression test for issue 67856
 
 #![feature(unboxed_closures)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![feature(fn_traits)]
 
 trait MyTrait {}
diff --git a/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.full_tait.stderr
new file mode 100644
index 00000000000..4effd87120e
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-52843-closure-constrain.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/issue-52843-closure-constrain.rs:13:16
+   |
+LL |     let null = || -> Opaque { 0 };
+   |                ^^^^^^^^^^^^^^^^^^ expected `String`, got `i32`
+   |
+note: previous use here
+  --> $DIR/issue-52843-closure-constrain.rs:12:5
+   |
+LL |     fn _unused() -> Opaque { String::new() }
+   |     ^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.stderr b/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.min_tait.stderr
similarity index 77%
rename from src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.stderr
rename to src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.min_tait.stderr
index d82050e263e..d71e12c60ff 100644
--- a/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.min_tait.stderr
@@ -1,11 +1,11 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/issue-52843-closure-constrain.rs:10:16
+  --> $DIR/issue-52843-closure-constrain.rs:13:16
    |
 LL |     let null = || -> Opaque { 0 };
    |                ^^^^^^^^^^^^^^^^^^ expected `String`, got `i32`
    |
 note: previous use here
-  --> $DIR/issue-52843-closure-constrain.rs:9:5
+  --> $DIR/issue-52843-closure-constrain.rs:12:5
    |
 LL |     fn _unused() -> Opaque { String::new() }
    |     ^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.rs b/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.rs
index 50eeff0b18f..e4ccb3742bc 100644
--- a/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-52843-closure-constrain.rs
@@ -1,6 +1,9 @@
 // Checks to ensure that we properly detect when a closure constrains an opaque type
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-52843.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-52843.full_tait.stderr
new file mode 100644
index 00000000000..14f4f62d7a5
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-52843.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-52843.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0277]: the trait bound `T: Default` is not satisfied
+  --> $DIR/issue-52843.rs:6:15
+   |
+LL | type Foo<T> = impl Default;
+   |               ^^^^^^^^^^^^ the trait `Default` is not implemented for `T`
+   |
+help: consider restricting type parameter `T`
+   |
+LL | type Foo<T: Default> = impl Default;
+   |           ^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-52843.stderr b/src/test/ui/type-alias-impl-trait/issue-52843.min_tait.stderr
similarity index 92%
rename from src/test/ui/type-alias-impl-trait/issue-52843.stderr
rename to src/test/ui/type-alias-impl-trait/issue-52843.min_tait.stderr
index 25db8dfabfc..6dda27f515e 100644
--- a/src/test/ui/type-alias-impl-trait/issue-52843.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-52843.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `T: Default` is not satisfied
-  --> $DIR/issue-52843.rs:3:15
+  --> $DIR/issue-52843.rs:6:15
    |
 LL | type Foo<T> = impl Default;
    |               ^^^^^^^^^^^^ the trait `Default` is not implemented for `T`
diff --git a/src/test/ui/type-alias-impl-trait/issue-52843.rs b/src/test/ui/type-alias-impl-trait/issue-52843.rs
index b24959d7207..14f9db6eae2 100644
--- a/src/test/ui/type-alias-impl-trait/issue-52843.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-52843.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Foo<T> = impl Default;
 //~^ ERROR: the trait bound `T: Default` is not satisfied
diff --git a/src/test/ui/type-alias-impl-trait/issue-53096.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-53096.full_tait.stderr
new file mode 100644
index 00000000000..38756ce4eb8
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-53096.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-53096.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-53096.rs:5:56
+   |
+LL | #![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+   |                                                        ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-53096.rs b/src/test/ui/type-alias-impl-trait/issue-53096.rs
index 6e1973bd18a..00c04935e50 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53096.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-53096.rs
@@ -1,6 +1,10 @@
 // check-pass
 #![feature(const_impl_trait, const_fn_fn_ptr_basics)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 
 type Foo = impl Fn() -> usize;
 const fn bar() -> Foo { || 0usize }
diff --git a/src/test/ui/type-alias-impl-trait/issue-53598.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-53598.full_tait.stderr
new file mode 100644
index 00000000000..8c2d713c160
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-53598.full_tait.stderr
@@ -0,0 +1,21 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-53598.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+  --> $DIR/issue-53598.rs:24:42
+   |
+LL |       fn foo<T: Debug>(_: T) -> Self::Item {
+   |  __________________________________________^
+LL | |
+LL | |         S::<T>(Default::default())
+LL | |     }
+   | |_____^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-53598.stderr b/src/test/ui/type-alias-impl-trait/issue-53598.min_tait.stderr
similarity index 91%
rename from src/test/ui/type-alias-impl-trait/issue-53598.stderr
rename to src/test/ui/type-alias-impl-trait/issue-53598.min_tait.stderr
index 79e2682da3e..cb5d6ec8040 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53598.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-53598.min_tait.stderr
@@ -1,5 +1,5 @@
 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-  --> $DIR/issue-53598.rs:21:42
+  --> $DIR/issue-53598.rs:24:42
    |
 LL |       fn foo<T: Debug>(_: T) -> Self::Item {
    |  __________________________________________^
diff --git a/src/test/ui/type-alias-impl-trait/issue-53598.rs b/src/test/ui/type-alias-impl-trait/issue-53598.rs
index add96629380..1388c587db9 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53598.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-53598.rs
@@ -1,6 +1,9 @@
 // ignore-tidy-linelength
 // ignore-compare-mode-chalk
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.full_tait.stderr
new file mode 100644
index 00000000000..fe3b739dd0b
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-53678-generator-and-const-fn.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-53678-generator-and-const-fn.rs:6:56
+   |
+LL | #![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+   |                                                        ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.rs b/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.rs
index 4582d5386f0..35001eb70a0 100644
--- a/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-53678-generator-and-const-fn.rs
@@ -1,6 +1,11 @@
 // check-pass
 
-#![feature(const_impl_trait, generators, generator_trait, type_alias_impl_trait)]
+#![feature(const_impl_trait, generators, generator_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(impl_trait_in_bindings, type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 
 use std::ops::Generator;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.full_tait.stderr
new file mode 100644
index 00000000000..98778210bfb
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-55099-lifetime-inference.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.rs b/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.rs
index 8e8508cdd6f..2c24e9d744a 100644
--- a/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-55099-lifetime-inference.rs
@@ -3,7 +3,10 @@
 // Tests that we don't incorrectly consider a lifetime to part
 // of the concrete type
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Future {
 }
diff --git a/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.full_tait.stderr
new file mode 100644
index 00000000000..d31c232fc23
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-57188-associate-impl-capture.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.rs b/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.rs
index 3a7a5da075f..645a4c5696d 100644
--- a/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-57188-associate-impl-capture.rs
@@ -2,7 +2,10 @@
 
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 struct Baz<'a> {
     source: &'a str,
diff --git a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.full_tait.stderr
new file mode 100644
index 00000000000..d90f328708a
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.full_tait.stderr
@@ -0,0 +1,67 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-57611-trait-alias.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: implementation of `FnOnce` is not general enough
+  --> $DIR/issue-57611-trait-alias.rs:20:16
+   |
+LL |     type Bar = impl Baz<Self, Self>;
+   |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
+   |
+   = note: closure with signature `fn(&'2 X) -> &X` must implement `FnOnce<(&'1 X,)>`, for any lifetime `'1`...
+   = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
+
+error[E0308]: mismatched types
+  --> $DIR/issue-57611-trait-alias.rs:20:16
+   |
+LL |     type Bar = impl Baz<Self, Self>;
+   |                ^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
+   |
+   = note: expected type `for<'r> Fn<(&'r X,)>`
+              found type `Fn<(&'<empty> X,)>`
+note: this closure does not fulfill the lifetime requirements
+  --> $DIR/issue-57611-trait-alias.rs:28:9
+   |
+LL |         |x| x
+   |         ^^^^^
+
+error: implementation of `FnOnce` is not general enough
+  --> $DIR/issue-57611-trait-alias.rs:20:16
+   |
+LL |     type Bar = impl Baz<Self, Self>;
+   |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
+   |
+   = note: closure with signature `fn(&'2 X) -> &'2 X` must implement `FnOnce<(&'1 X,)>`, for any lifetime `'1`...
+   = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
+
+error[E0308]: mismatched types
+  --> $DIR/issue-57611-trait-alias.rs:20:16
+   |
+LL |     type Bar = impl Baz<Self, Self>;
+   |                ^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
+   |
+   = note: expected type `for<'r> Fn<(&'r X,)>`
+              found type `Fn<(&'<empty> X,)>`
+note: this closure does not fulfill the lifetime requirements
+  --> $DIR/issue-57611-trait-alias.rs:28:9
+   |
+LL |         |x| x
+   |         ^^^^^
+
+error: implementation of `FnOnce` is not general enough
+  --> $DIR/issue-57611-trait-alias.rs:20:16
+   |
+LL |     type Bar = impl Baz<Self, Self>;
+   |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
+   |
+   = note: closure with signature `fn(&'2 X) -> &'2 X` must implement `FnOnce<(&'1 X,)>`, for any lifetime `'1`...
+   = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
+
+error: aborting due to 5 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.min_tait.stderr
similarity index 87%
rename from src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr
rename to src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.min_tait.stderr
index 91c9d459ad8..d019f40757e 100644
--- a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.min_tait.stderr
@@ -1,5 +1,5 @@
 error: implementation of `FnOnce` is not general enough
-  --> $DIR/issue-57611-trait-alias.rs:17:16
+  --> $DIR/issue-57611-trait-alias.rs:20:16
    |
 LL |     type Bar = impl Baz<Self, Self>;
    |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
@@ -8,7 +8,7 @@ LL |     type Bar = impl Baz<Self, Self>;
    = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-57611-trait-alias.rs:17:16
+  --> $DIR/issue-57611-trait-alias.rs:20:16
    |
 LL |     type Bar = impl Baz<Self, Self>;
    |                ^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
@@ -16,13 +16,13 @@ LL |     type Bar = impl Baz<Self, Self>;
    = note: expected type `for<'r> Fn<(&'r X,)>`
               found type `Fn<(&'<empty> X,)>`
 note: this closure does not fulfill the lifetime requirements
-  --> $DIR/issue-57611-trait-alias.rs:25:9
+  --> $DIR/issue-57611-trait-alias.rs:28:9
    |
 LL |         |x| x
    |         ^^^^^
 
 error: implementation of `FnOnce` is not general enough
-  --> $DIR/issue-57611-trait-alias.rs:17:16
+  --> $DIR/issue-57611-trait-alias.rs:20:16
    |
 LL |     type Bar = impl Baz<Self, Self>;
    |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
@@ -31,7 +31,7 @@ LL |     type Bar = impl Baz<Self, Self>;
    = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-57611-trait-alias.rs:17:16
+  --> $DIR/issue-57611-trait-alias.rs:20:16
    |
 LL |     type Bar = impl Baz<Self, Self>;
    |                ^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
@@ -39,13 +39,13 @@ LL |     type Bar = impl Baz<Self, Self>;
    = note: expected type `for<'r> Fn<(&'r X,)>`
               found type `Fn<(&'<empty> X,)>`
 note: this closure does not fulfill the lifetime requirements
-  --> $DIR/issue-57611-trait-alias.rs:25:9
+  --> $DIR/issue-57611-trait-alias.rs:28:9
    |
 LL |         |x| x
    |         ^^^^^
 
 error: implementation of `FnOnce` is not general enough
-  --> $DIR/issue-57611-trait-alias.rs:17:16
+  --> $DIR/issue-57611-trait-alias.rs:20:16
    |
 LL |     type Bar = impl Baz<Self, Self>;
    |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
diff --git a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs
index 561528c2abb..ccc727e0bf0 100644
--- a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs
@@ -3,7 +3,10 @@
 // FIXME: This should compile, but it currently doesn't
 
 #![feature(trait_alias)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Foo {
     type Bar: Baz<Self, Self>;
diff --git a/src/test/ui/type-alias-impl-trait/issue-57700.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-57700.full_tait.stderr
new file mode 100644
index 00000000000..f92a5997a9b
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-57700.full_tait.stderr
@@ -0,0 +1,21 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-57700.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: type parameter `impl Deref<Target = Self>` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+  --> $DIR/issue-57700.rs:20:58
+   |
+LL |       fn foo(self: impl Deref<Target = Self>) -> Self::Bar {
+   |  __________________________________________________________^
+LL | |
+LL | |         self
+LL | |     }
+   | |_____^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-57700.stderr b/src/test/ui/type-alias-impl-trait/issue-57700.min_tait.stderr
similarity index 92%
rename from src/test/ui/type-alias-impl-trait/issue-57700.stderr
rename to src/test/ui/type-alias-impl-trait/issue-57700.min_tait.stderr
index dc6be87ee93..1aaa42b99ac 100644
--- a/src/test/ui/type-alias-impl-trait/issue-57700.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-57700.min_tait.stderr
@@ -1,5 +1,5 @@
 error: type parameter `impl Deref<Target = Self>` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-  --> $DIR/issue-57700.rs:17:58
+  --> $DIR/issue-57700.rs:20:58
    |
 LL |       fn foo(self: impl Deref<Target = Self>) -> Self::Bar {
    |  __________________________________________________________^
diff --git a/src/test/ui/type-alias-impl-trait/issue-57700.rs b/src/test/ui/type-alias-impl-trait/issue-57700.rs
index c785ea2ee57..c7a123ad240 100644
--- a/src/test/ui/type-alias-impl-trait/issue-57700.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-57700.rs
@@ -1,7 +1,10 @@
 // ignore-tidy-linelength
 // ignore-compare-mode-chalk
 #![feature(arbitrary_self_types)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::ops::Deref;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.full_tait.stderr
new file mode 100644
index 00000000000..b35361c89a4
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-57807-associated-type.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.rs b/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.rs
index fcab2c7db26..0a021149e70 100644
--- a/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-57807-associated-type.rs
@@ -2,7 +2,10 @@
 // that we properly unify associated types within
 // a type alias impl trait
 // check-pass
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Bar {
     type A;
diff --git a/src/test/ui/type-alias-impl-trait/issue-58887.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-58887.full_tait.stderr
new file mode 100644
index 00000000000..f0fd5f2f056
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-58887.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-58887.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-58887.rs b/src/test/ui/type-alias-impl-trait/issue-58887.rs
index 96ac7860283..f0803a663de 100644
--- a/src/test/ui/type-alias-impl-trait/issue-58887.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-58887.rs
@@ -1,6 +1,9 @@
 // run-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait UnwrapItemsExt {
     type Iter;
diff --git a/src/test/ui/type-alias-impl-trait/issue-58951.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-58951.full_tait.stderr
new file mode 100644
index 00000000000..164b8881714
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-58951.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-58951.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-58951.rs b/src/test/ui/type-alias-impl-trait/issue-58951.rs
index 3416c6745bb..3b1ea0d676b 100644
--- a/src/test/ui/type-alias-impl-trait/issue-58951.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-58951.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type A = impl Iterator;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-60371.stderr b/src/test/ui/type-alias-impl-trait/issue-60371.stderr
index d8e514a2cf4..461b8517ca4 100644
--- a/src/test/ui/type-alias-impl-trait/issue-60371.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-60371.stderr
@@ -5,7 +5,7 @@ LL |     type Item = impl Bug;
    |                 ^^^^^^^^
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
-   = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable
 
 error[E0277]: the trait bound `(): Bug` is not satisfied
   --> $DIR/issue-60371.rs:10:17
diff --git a/src/test/ui/type-alias-impl-trait/issue-60407.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-60407.full_tait.stderr
new file mode 100644
index 00000000000..31f7a77818c
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-60407.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-60407.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-60407.rs:5:55
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-60407.rs b/src/test/ui/type-alias-impl-trait/issue-60407.rs
index 7d462f057cb..e2a2fb838b9 100644
--- a/src/test/ui/type-alias-impl-trait/issue-60407.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-60407.rs
@@ -1,6 +1,10 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 
 type Debuggable = impl core::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-60564.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-60564.full_tait.stderr
new file mode 100644
index 00000000000..72b6b0648f9
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-60564.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-60564.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/issue-60564.rs:22:34
+   |
+LL |     fn iter_bits(self, n: u8) -> Self::BitsIter {
+   |                                  ^^^^^^^^^^^^^^
+   |
+note: used non-generic type `u8` for generic parameter
+  --> $DIR/issue-60564.rs:11:25
+   |
+LL | type IterBitsIter<T, E, I> = impl std::iter::Iterator<Item = I>;
+   |                         ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-60564.stderr b/src/test/ui/type-alias-impl-trait/issue-60564.min_tait.stderr
similarity index 85%
rename from src/test/ui/type-alias-impl-trait/issue-60564.stderr
rename to src/test/ui/type-alias-impl-trait/issue-60564.min_tait.stderr
index 66fa862ef9d..72668c8056f 100644
--- a/src/test/ui/type-alias-impl-trait/issue-60564.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-60564.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/issue-60564.rs:19:34
+  --> $DIR/issue-60564.rs:22:34
    |
 LL |     fn iter_bits(self, n: u8) -> Self::BitsIter {
    |                                  ^^^^^^^^^^^^^^
    |
 note: used non-generic type `u8` for generic parameter
-  --> $DIR/issue-60564.rs:8:25
+  --> $DIR/issue-60564.rs:11:25
    |
 LL | type IterBitsIter<T, E, I> = impl std::iter::Iterator<Item = I>;
    |                         ^
diff --git a/src/test/ui/type-alias-impl-trait/issue-60564.rs b/src/test/ui/type-alias-impl-trait/issue-60564.rs
index 78def0d1136..10fbbd2ef29 100644
--- a/src/test/ui/type-alias-impl-trait/issue-60564.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-60564.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait IterBits {
     type BitsIter: Iterator<Item = u8>;
diff --git a/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.full_tait.stderr
new file mode 100644
index 00000000000..1fc38d2f549
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-62000-associate-impl-trait-lifetimes.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.rs b/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.rs
index 36779a0ce89..4d9ca47b947 100644
--- a/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.rs
@@ -2,7 +2,10 @@
 
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait MyTrait {
     type AssocType: Send;
diff --git a/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.full_tait.stderr
new file mode 100644
index 00000000000..1c6759e3454
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-63263-closure-return.rs:9:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.rs b/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.rs
index 7414611a748..3b8f6afcb00 100644
--- a/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.rs
@@ -4,7 +4,8 @@
 
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait, type_alias_impl_trait)]
+//~^ WARN incomplete
 
 pub type Closure = impl FnOnce();
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.stderr b/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.stderr
new file mode 100644
index 00000000000..e1f4ecd3b98
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-63263-closure-return.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-63263-closure-return.rs:7:39
+   |
+LL | #![feature(min_type_alias_impl_trait, type_alias_impl_trait)]
+   |                                       ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-63279.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-63279.full_tait.stderr
new file mode 100644
index 00000000000..f544f61df97
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-63279.full_tait.stderr
@@ -0,0 +1,21 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-63279.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0271]: type mismatch resolving `<[closure@$DIR/issue-63279.rs:11:5: 11:28] as FnOnce<()>>::Output == ()`
+  --> $DIR/issue-63279.rs:8:16
+   |
+LL | type Closure = impl FnOnce();
+   |                ^^^^^^^^^^^^^ expected opaque type, found `()`
+   |
+   = note: expected opaque type `impl FnOnce<()>`
+                found unit type `()`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0271`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-63279.stderr b/src/test/ui/type-alias-impl-trait/issue-63279.min_tait.stderr
similarity index 82%
rename from src/test/ui/type-alias-impl-trait/issue-63279.stderr
rename to src/test/ui/type-alias-impl-trait/issue-63279.min_tait.stderr
index 8615b3f741b..3ecca1270a9 100644
--- a/src/test/ui/type-alias-impl-trait/issue-63279.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-63279.min_tait.stderr
@@ -1,5 +1,5 @@
-error[E0271]: type mismatch resolving `<[closure@$DIR/issue-63279.rs:8:5: 8:28] as FnOnce<()>>::Output == ()`
-  --> $DIR/issue-63279.rs:5:16
+error[E0271]: type mismatch resolving `<[closure@$DIR/issue-63279.rs:11:5: 11:28] as FnOnce<()>>::Output == ()`
+  --> $DIR/issue-63279.rs:8:16
    |
 LL | type Closure = impl FnOnce();
    |                ^^^^^^^^^^^^^ expected opaque type, found `()`
diff --git a/src/test/ui/type-alias-impl-trait/issue-63279.rs b/src/test/ui/type-alias-impl-trait/issue-63279.rs
index b97192a2aed..3b0bddf8f7b 100644
--- a/src/test/ui/type-alias-impl-trait/issue-63279.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-63279.rs
@@ -1,6 +1,9 @@
 // compile-flags: -Zsave-analysis
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Closure = impl FnOnce(); //~ ERROR: type mismatch resolving
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.full_tait.stderr
new file mode 100644
index 00000000000..fc8d8147167
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-63677-type-alias-coherence.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs b/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs
index 28f4a85c9f2..62d11ad38d6 100644
--- a/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs
@@ -2,7 +2,10 @@
 // Regression test for issue #63677 - ensure that
 // coherence checking can properly handle 'impl trait'
 // in type aliases
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait Trait {}
 pub struct S1<T>(T);
diff --git a/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.full_tait.stderr
new file mode 100644
index 00000000000..8a51c14a008
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-65679-inst-opaque-ty-from-val-twice.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-65679-inst-opaque-ty-from-val-twice.rs:6:55
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs b/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs
index 26d97cea989..09709639c7b 100644
--- a/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs
@@ -1,7 +1,11 @@
 // compile-flags: -Zsave-analysis
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait, rustc_attrs)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 
 type T = impl Sized;
 // The concrete type referred by impl-trait-type-alias(`T`) is guaranteed
diff --git a/src/test/ui/type-alias-impl-trait/issue-65918.rs b/src/test/ui/type-alias-impl-trait/issue-65918.rs
index af6d5010920..ab05e4b1cbe 100644
--- a/src/test/ui/type-alias-impl-trait/issue-65918.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-65918.rs
@@ -2,7 +2,10 @@
 
 // build-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::marker::PhantomData;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.full_tait.stderr
new file mode 100644
index 00000000000..2fc46574512
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-66580-closure-coherence.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.rs b/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.rs
index 1d95cc7530c..7b3ddc78868 100644
--- a/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-66580-closure-coherence.rs
@@ -2,7 +2,10 @@
 // Ensures that we don't try to determine whether a closure
 // is foreign when it's the underlying type of an opaque type
 // check-pass
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Closure = impl FnOnce();
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.full_tait.stderr
new file mode 100644
index 00000000000..81e27da0949
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-67844-nested-opaque.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs b/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs
index 7da0b049264..b9e29a01cdd 100644
--- a/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs
@@ -3,7 +3,10 @@
 // Ensures that we properly handle nested TAIT occurrences
 // with generic parameters
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait WithAssoc { type AssocType; }
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.full_tait.stderr
new file mode 100644
index 00000000000..8b1ad19ac0c
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-68368-non-defining-use.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/issue-68368-non-defining-use.rs:11:15
+   |
+LL | fn f<'a>() -> Alias<'a, ()> {}
+   |               ^^^^^^^^^^^^^
+   |
+note: used non-generic type `()` for generic parameter
+  --> $DIR/issue-68368-non-defining-use.rs:10:16
+   |
+LL | type Alias<'a, U> = impl Trait<U>;
+   |                ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.stderr b/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.min_tait.stderr
similarity index 75%
rename from src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.stderr
rename to src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.min_tait.stderr
index c2fa54f50f8..01ae457851f 100644
--- a/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/issue-68368-non-defining-use.rs:8:15
+  --> $DIR/issue-68368-non-defining-use.rs:11:15
    |
 LL | fn f<'a>() -> Alias<'a, ()> {}
    |               ^^^^^^^^^^^^^
    |
 note: used non-generic type `()` for generic parameter
-  --> $DIR/issue-68368-non-defining-use.rs:7:16
+  --> $DIR/issue-68368-non-defining-use.rs:10:16
    |
 LL | type Alias<'a, U> = impl Trait<U>;
    |                ^
diff --git a/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.rs b/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.rs
index 3b6decbe9c6..92465076733 100644
--- a/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-68368-non-defining-use.rs
@@ -2,7 +2,10 @@
 // Ensures that we don't ICE when emitting an error
 // for a non-defining use when lifetimes are involved
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 trait Trait<T> {}
 type Alias<'a, U> = impl Trait<U>;
 fn f<'a>() -> Alias<'a, ()> {}
diff --git a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.full_tait.stderr
new file mode 100644
index 00000000000..7f120af2408
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.full_tait.stderr
@@ -0,0 +1,20 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-69136-inner-lifetime-resolve-error.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/issue-69136-inner-lifetime-resolve-error.rs:20:65
+   |
+LL | type Return<A> = impl WithAssoc<A, AssocType = impl SomeTrait + 'a>;
+   |             -                                                   ^^ undeclared lifetime
+   |             |
+   |             help: consider introducing lifetime `'a` here: `'a,`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0261`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.stderr b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.min_tait.stderr
similarity index 87%
rename from src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.stderr
rename to src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.min_tait.stderr
index fe45e39d938..e1fc94c3472 100644
--- a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0261]: use of undeclared lifetime name `'a`
-  --> $DIR/issue-69136-inner-lifetime-resolve-error.rs:17:65
+  --> $DIR/issue-69136-inner-lifetime-resolve-error.rs:20:65
    |
 LL | type Return<A> = impl WithAssoc<A, AssocType = impl SomeTrait + 'a>;
    |             -                                                   ^^ undeclared lifetime
diff --git a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.rs b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.rs
index 6732902c09a..61161d44e51 100644
--- a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-error.rs
@@ -1,6 +1,9 @@
 // Regression test for #69136
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait SomeTrait {}
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.full_tait.stderr
new file mode 100644
index 00000000000..61e2e20dfd0
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-69136-inner-lifetime-resolve-ok.rs:7:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.rs b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.rs
index a6916eda8b0..01df967a4a5 100644
--- a/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-69136-inner-lifetime-resolve-ok.rs
@@ -2,7 +2,10 @@
 
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait SomeTrait {}
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-70121.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-70121.full_tait.stderr
new file mode 100644
index 00000000000..9fe2e2cf88e
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-70121.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-70121.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-70121.rs b/src/test/ui/type-alias-impl-trait/issue-70121.rs
index dff0d89d465..150eca46975 100644
--- a/src/test/ui/type-alias-impl-trait/issue-70121.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-70121.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub type Successors<'a> = impl Iterator<Item = &'a ()>;
 
diff --git a/src/test/ui/type-alias-impl-trait/issue-74244.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-74244.full_tait.stderr
new file mode 100644
index 00000000000..e7729e47c36
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-74244.full_tait.stderr
@@ -0,0 +1,18 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-74244.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/issue-74244.rs:12:6
+   |
+LL | impl<T> Allocator for DefaultAllocator {
+   |      ^ unconstrained type parameter
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0207`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-74244.stderr b/src/test/ui/type-alias-impl-trait/issue-74244.min_tait.stderr
similarity index 90%
rename from src/test/ui/type-alias-impl-trait/issue-74244.stderr
rename to src/test/ui/type-alias-impl-trait/issue-74244.min_tait.stderr
index ff6bacd277e..6ee8c58826d 100644
--- a/src/test/ui/type-alias-impl-trait/issue-74244.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-74244.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/issue-74244.rs:9:6
+  --> $DIR/issue-74244.rs:12:6
    |
 LL | impl<T> Allocator for DefaultAllocator {
    |      ^ unconstrained type parameter
diff --git a/src/test/ui/type-alias-impl-trait/issue-74244.rs b/src/test/ui/type-alias-impl-trait/issue-74244.rs
index bb4104b3d25..890eb23ef95 100644
--- a/src/test/ui/type-alias-impl-trait/issue-74244.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-74244.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Allocator {
     type Buffer;
diff --git a/src/test/ui/type-alias-impl-trait/issue-74761.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-74761.full_tait.stderr
new file mode 100644
index 00000000000..0880136d71b
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-74761.full_tait.stderr
@@ -0,0 +1,24 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-74761.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/issue-74761.rs:11:6
+   |
+LL | impl<'a, 'b> A for () {
+   |      ^^ unconstrained lifetime parameter
+
+error[E0207]: the lifetime parameter `'b` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/issue-74761.rs:11:10
+   |
+LL | impl<'a, 'b> A for () {
+   |          ^^ unconstrained lifetime parameter
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0207`.
diff --git a/src/test/ui/type-alias-impl-trait/issue-74761.stderr b/src/test/ui/type-alias-impl-trait/issue-74761.min_tait.stderr
similarity index 88%
rename from src/test/ui/type-alias-impl-trait/issue-74761.stderr
rename to src/test/ui/type-alias-impl-trait/issue-74761.min_tait.stderr
index 3f38fa4de01..20ebdd9cb50 100644
--- a/src/test/ui/type-alias-impl-trait/issue-74761.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-74761.min_tait.stderr
@@ -1,11 +1,11 @@
 error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/issue-74761.rs:8:6
+  --> $DIR/issue-74761.rs:11:6
    |
 LL | impl<'a, 'b> A for () {
    |      ^^ unconstrained lifetime parameter
 
 error[E0207]: the lifetime parameter `'b` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/issue-74761.rs:8:10
+  --> $DIR/issue-74761.rs:11:10
    |
 LL | impl<'a, 'b> A for () {
    |          ^^ unconstrained lifetime parameter
diff --git a/src/test/ui/type-alias-impl-trait/issue-74761.rs b/src/test/ui/type-alias-impl-trait/issue-74761.rs
index 4345b5d886e..66bb079b25a 100644
--- a/src/test/ui/type-alias-impl-trait/issue-74761.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-74761.rs
@@ -1,5 +1,8 @@
 #![feature(member_constraints)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait A {
     type B;
diff --git a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.full_tait.stderr b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.full_tait.stderr
new file mode 100644
index 00000000000..8fb4a3b6625
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-76202-trait-impl-for-tait.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: cannot implement trait on type alias impl trait
+  --> $DIR/issue-76202-trait-impl-for-tait.rs:19:1
+   |
+LL | impl Test for F {
+   | ^^^^^^^^^^^^^^^
+   |
+note: type alias impl trait defined here
+  --> $DIR/issue-76202-trait-impl-for-tait.rs:12:10
+   |
+LL | type F = impl Dummy;
+   |          ^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.stderr b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.min_tait.stderr
similarity index 70%
rename from src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.stderr
rename to src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.min_tait.stderr
index 8689ee53660..3754553772c 100644
--- a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.stderr
+++ b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.min_tait.stderr
@@ -1,11 +1,11 @@
 error: cannot implement trait on type alias impl trait
-  --> $DIR/issue-76202-trait-impl-for-tait.rs:16:1
+  --> $DIR/issue-76202-trait-impl-for-tait.rs:19:1
    |
 LL | impl Test for F {
    | ^^^^^^^^^^^^^^^
    |
 note: type alias impl trait defined here
-  --> $DIR/issue-76202-trait-impl-for-tait.rs:9:10
+  --> $DIR/issue-76202-trait-impl-for-tait.rs:12:10
    |
 LL | type F = impl Dummy;
    |          ^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs
index 9ce19536e79..276c770fe48 100644
--- a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs
+++ b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs
@@ -1,7 +1,10 @@
 // Regression test for issue #76202
 // Tests that we don't ICE when we have a trait impl on a TAIT.
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Dummy {}
 impl Dummy for () {}
diff --git a/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.full_tait.stderr b/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.full_tait.stderr
new file mode 100644
index 00000000000..5e4307be17a
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/nested_type_alias_impl_trait.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs b/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs
index 82c9ecd2ac6..f03563dfed6 100644
--- a/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs
+++ b/src/test/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // build-pass (FIXME(62277): could be check-pass?)
 mod my_mod {
   use std::fmt::Debug;
diff --git a/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.full_tait.stderr b/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.full_tait.stderr
new file mode 100644
index 00000000000..45c95469e95
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.full_tait.stderr
@@ -0,0 +1,33 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/never_reveal_concrete_type.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0308]: mismatched types
+  --> $DIR/never_reveal_concrete_type.rs:16:27
+   |
+LL | type NoReveal = impl std::fmt::Debug;
+   |                 -------------------- the found opaque type
+...
+LL |     let _: &'static str = x;
+   |            ------------   ^ expected `&str`, found opaque type
+   |            |
+   |            expected due to this
+   |
+   = note: expected reference `&'static str`
+            found opaque type `impl Debug`
+
+error[E0605]: non-primitive cast: `impl Debug` as `&'static str`
+  --> $DIR/never_reveal_concrete_type.rs:17:13
+   |
+LL |     let _ = x as &'static str;
+   |             ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0308, E0605.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.stderr b/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.min_tait.stderr
similarity index 89%
rename from src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.stderr
rename to src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.min_tait.stderr
index b438f844516..530f8876cf2 100644
--- a/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.stderr
+++ b/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/never_reveal_concrete_type.rs:13:27
+  --> $DIR/never_reveal_concrete_type.rs:16:27
    |
 LL | type NoReveal = impl std::fmt::Debug;
    |                 -------------------- the found opaque type
@@ -13,7 +13,7 @@ LL |     let _: &'static str = x;
             found opaque type `impl Debug`
 
 error[E0605]: non-primitive cast: `impl Debug` as `&'static str`
-  --> $DIR/never_reveal_concrete_type.rs:14:13
+  --> $DIR/never_reveal_concrete_type.rs:17:13
    |
 LL |     let _ = x as &'static str;
    |             ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
diff --git a/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.rs b/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.rs
index 8787c023eb0..c555b9cdded 100644
--- a/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.rs
+++ b/src/test/ui/type-alias-impl-trait/never_reveal_concrete_type.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.full_tait.stderr b/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.full_tait.stderr
new file mode 100644
index 00000000000..faddecb2176
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.full_tait.stderr
@@ -0,0 +1,17 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/no_inferrable_concrete_type.rs:6:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: could not find defining uses
+  --> $DIR/no_inferrable_concrete_type.rs:9:12
+   |
+LL | type Foo = impl Copy;
+   |            ^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr b/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.min_tait.stderr
similarity index 74%
rename from src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr
rename to src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.min_tait.stderr
index 61025e84692..3194bd76107 100644
--- a/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr
+++ b/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.min_tait.stderr
@@ -1,5 +1,5 @@
 error: could not find defining uses
-  --> $DIR/no_inferrable_concrete_type.rs:6:12
+  --> $DIR/no_inferrable_concrete_type.rs:9:12
    |
 LL | type Foo = impl Copy;
    |            ^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs b/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs
index c9ca504f780..4fdaa033fb0 100644
--- a/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs
+++ b/src/test/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs
@@ -1,7 +1,10 @@
 // Issue 52985: user code provides no use case that allows a type alias `impl Trait`
 // We now emit a 'could not find defining uses' error
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Foo = impl Copy; //~ could not find defining uses
 
diff --git a/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.full_tait.stderr b/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.full_tait.stderr
new file mode 100644
index 00000000000..8699b21929f
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.full_tait.stderr
@@ -0,0 +1,40 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/no_revealing_outside_defining_module.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0308]: mismatched types
+  --> $DIR/no_revealing_outside_defining_module.rs:18:19
+   |
+LL |     pub type Boo = impl ::std::fmt::Debug;
+   |                    ---------------------- the found opaque type
+...
+LL |     let _: &str = bomp();
+   |            ----   ^^^^^^ expected `&str`, found opaque type
+   |            |
+   |            expected due to this
+   |
+   = note: expected reference `&str`
+            found opaque type `impl Debug`
+
+error[E0308]: mismatched types
+  --> $DIR/no_revealing_outside_defining_module.rs:22:5
+   |
+LL |     pub type Boo = impl ::std::fmt::Debug;
+   |                    ---------------------- the expected opaque type
+...
+LL | fn bomp() -> boo::Boo {
+   |              -------- expected `impl Debug` because of return type
+LL |     ""
+   |     ^^ expected opaque type, found `&str`
+   |
+   = note: expected opaque type `impl Debug`
+                found reference `&'static str`
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.stderr b/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.min_tait.stderr
similarity index 89%
rename from src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.stderr
rename to src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.min_tait.stderr
index 67752acb8c9..faaab439352 100644
--- a/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.stderr
+++ b/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/no_revealing_outside_defining_module.rs:15:19
+  --> $DIR/no_revealing_outside_defining_module.rs:18:19
    |
 LL |     pub type Boo = impl ::std::fmt::Debug;
    |                    ---------------------- the found opaque type
@@ -13,7 +13,7 @@ LL |     let _: &str = bomp();
             found opaque type `impl Debug`
 
 error[E0308]: mismatched types
-  --> $DIR/no_revealing_outside_defining_module.rs:19:5
+  --> $DIR/no_revealing_outside_defining_module.rs:22:5
    |
 LL |     pub type Boo = impl ::std::fmt::Debug;
    |                    ---------------------- the expected opaque type
diff --git a/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.rs b/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.rs
index 61153b1e171..566c311b9bd 100644
--- a/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.rs
+++ b/src/test/ui/type-alias-impl-trait/no_revealing_outside_defining_module.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {}
 
diff --git a/src/test/ui/type-alias-impl-trait/not_a_defining_use.full_tait.stderr b/src/test/ui/type-alias-impl-trait/not_a_defining_use.full_tait.stderr
new file mode 100644
index 00000000000..76e3500e8a9
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/not_a_defining_use.full_tait.stderr
@@ -0,0 +1,23 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/not_a_defining_use.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: non-defining opaque type use in defining scope
+  --> $DIR/not_a_defining_use.rs:12:27
+   |
+LL | fn two<T: Debug>(t: T) -> Two<T, u32> {
+   |                           ^^^^^^^^^^^
+   |
+note: used non-generic type `u32` for generic parameter
+  --> $DIR/not_a_defining_use.rs:10:13
+   |
+LL | type Two<T, U> = impl Debug;
+   |             ^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/not_a_defining_use.stderr b/src/test/ui/type-alias-impl-trait/not_a_defining_use.min_tait.stderr
similarity index 79%
rename from src/test/ui/type-alias-impl-trait/not_a_defining_use.stderr
rename to src/test/ui/type-alias-impl-trait/not_a_defining_use.min_tait.stderr
index 2fa236b373a..f5dbfecc742 100644
--- a/src/test/ui/type-alias-impl-trait/not_a_defining_use.stderr
+++ b/src/test/ui/type-alias-impl-trait/not_a_defining_use.min_tait.stderr
@@ -1,11 +1,11 @@
 error: non-defining opaque type use in defining scope
-  --> $DIR/not_a_defining_use.rs:9:27
+  --> $DIR/not_a_defining_use.rs:12:27
    |
 LL | fn two<T: Debug>(t: T) -> Two<T, u32> {
    |                           ^^^^^^^^^^^
    |
 note: used non-generic type `u32` for generic parameter
-  --> $DIR/not_a_defining_use.rs:7:13
+  --> $DIR/not_a_defining_use.rs:10:13
    |
 LL | type Two<T, U> = impl Debug;
    |             ^
diff --git a/src/test/ui/type-alias-impl-trait/not_a_defining_use.rs b/src/test/ui/type-alias-impl-trait/not_a_defining_use.rs
index f29b980dfd0..e58f33fcff4 100644
--- a/src/test/ui/type-alias-impl-trait/not_a_defining_use.rs
+++ b/src/test/ui/type-alias-impl-trait/not_a_defining_use.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::fmt::Debug;
 
diff --git a/src/test/ui/type-alias-impl-trait/not_well_formed.full_tait.stderr b/src/test/ui/type-alias-impl-trait/not_well_formed.full_tait.stderr
new file mode 100644
index 00000000000..38f086ec45d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/not_well_formed.full_tait.stderr
@@ -0,0 +1,18 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/not_well_formed.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0220]: associated type `Assoc` not found for `V`
+  --> $DIR/not_well_formed.rs:13:29
+   |
+LL | type Foo<V> = impl Trait<V::Assoc>;
+   |                             ^^^^^ associated type `Assoc` not found
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0220`.
diff --git a/src/test/ui/type-alias-impl-trait/not_well_formed.stderr b/src/test/ui/type-alias-impl-trait/not_well_formed.min_tait.stderr
similarity index 88%
rename from src/test/ui/type-alias-impl-trait/not_well_formed.stderr
rename to src/test/ui/type-alias-impl-trait/not_well_formed.min_tait.stderr
index c2b6f7eae9f..3bac38cef7d 100644
--- a/src/test/ui/type-alias-impl-trait/not_well_formed.stderr
+++ b/src/test/ui/type-alias-impl-trait/not_well_formed.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0220]: associated type `Assoc` not found for `V`
-  --> $DIR/not_well_formed.rs:10:29
+  --> $DIR/not_well_formed.rs:13:29
    |
 LL | type Foo<V> = impl Trait<V::Assoc>;
    |                             ^^^^^ associated type `Assoc` not found
diff --git a/src/test/ui/type-alias-impl-trait/not_well_formed.rs b/src/test/ui/type-alias-impl-trait/not_well_formed.rs
index 36ec9b34ebd..6d511c58188 100644
--- a/src/test/ui/type-alias-impl-trait/not_well_formed.rs
+++ b/src/test/ui/type-alias-impl-trait/not_well_formed.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {
 }
diff --git a/src/test/ui/type-alias-impl-trait/structural-match-no-leak.full_tait.stderr b/src/test/ui/type-alias-impl-trait/structural-match-no-leak.full_tait.stderr
new file mode 100644
index 00000000000..b560c0c918a
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/structural-match-no-leak.full_tait.stderr
@@ -0,0 +1,25 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/structural-match-no-leak.rs:4:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/structural-match-no-leak.rs:4:55
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+error: `impl Send` cannot be used in patterns
+  --> $DIR/structural-match-no-leak.rs:19:9
+   |
+LL |         LEAK_FREE => (),
+   |         ^^^^^^^^^
+
+error: aborting due to previous error; 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/structural-match-no-leak.stderr b/src/test/ui/type-alias-impl-trait/structural-match-no-leak.min_tait.stderr
similarity index 76%
rename from src/test/ui/type-alias-impl-trait/structural-match-no-leak.stderr
rename to src/test/ui/type-alias-impl-trait/structural-match-no-leak.min_tait.stderr
index 889c4fd4b04..f1ac45ba5db 100644
--- a/src/test/ui/type-alias-impl-trait/structural-match-no-leak.stderr
+++ b/src/test/ui/type-alias-impl-trait/structural-match-no-leak.min_tait.stderr
@@ -1,5 +1,5 @@
 error: `impl Send` cannot be used in patterns
-  --> $DIR/structural-match-no-leak.rs:14:9
+  --> $DIR/structural-match-no-leak.rs:19:9
    |
 LL |         LEAK_FREE => (),
    |         ^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/structural-match-no-leak.rs b/src/test/ui/type-alias-impl-trait/structural-match-no-leak.rs
index 58f0f5b2f65..34d9663223b 100644
--- a/src/test/ui/type-alias-impl-trait/structural-match-no-leak.rs
+++ b/src/test/ui/type-alias-impl-trait/structural-match-no-leak.rs
@@ -1,4 +1,9 @@
-#![feature(const_impl_trait, type_alias_impl_trait)]
+#![feature(const_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait, impl_trait_in_bindings))]
+//[full_tait]~^ WARN incomplete
+//[full_tait]~| WARN incomplete
 
 type Bar = impl Send;
 
diff --git a/src/test/ui/type-alias-impl-trait/structural-match.full_tait.stderr b/src/test/ui/type-alias-impl-trait/structural-match.full_tait.stderr
new file mode 100644
index 00000000000..4202d0fff43
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/structural-match.full_tait.stderr
@@ -0,0 +1,17 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/structural-match.rs:4:36
+   |
+LL | #![cfg_attr(not(min_tait), feature(type_alias_impl_trait, min_type_alias_impl_trait))]
+   |                                    ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: `impl Send` cannot be used in patterns
+  --> $DIR/structural-match.rs:19:9
+   |
+LL |         VALUE => (),
+   |         ^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/structural-match.stderr b/src/test/ui/type-alias-impl-trait/structural-match.min_tait.stderr
similarity index 79%
rename from src/test/ui/type-alias-impl-trait/structural-match.stderr
rename to src/test/ui/type-alias-impl-trait/structural-match.min_tait.stderr
index 262fd072613..f63b1fb23df 100644
--- a/src/test/ui/type-alias-impl-trait/structural-match.stderr
+++ b/src/test/ui/type-alias-impl-trait/structural-match.min_tait.stderr
@@ -1,5 +1,5 @@
 error: `impl Send` cannot be used in patterns
-  --> $DIR/structural-match.rs:15:9
+  --> $DIR/structural-match.rs:19:9
    |
 LL |         VALUE => (),
    |         ^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/structural-match.rs b/src/test/ui/type-alias-impl-trait/structural-match.rs
index 74ffa608426..ceab13ba487 100644
--- a/src/test/ui/type-alias-impl-trait/structural-match.rs
+++ b/src/test/ui/type-alias-impl-trait/structural-match.rs
@@ -1,4 +1,8 @@
-#![feature(const_impl_trait, type_alias_impl_trait)]
+#![feature(const_impl_trait)]
+// revisions: min_tait full_tait
+#![cfg_attr(min_tait, feature(min_type_alias_impl_trait))]
+#![cfg_attr(not(min_tait), feature(type_alias_impl_trait, min_type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Foo = impl Send;
 
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.full_tait.stderr
new file mode 100644
index 00000000000..894d61502a7
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.full_tait.stderr
@@ -0,0 +1,19 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-const.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-const.rs:11:12
+   |
+LL | #![feature(impl_trait_in_bindings)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: 2 warnings emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.min_tait.stderr
similarity index 89%
rename from src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.stderr
rename to src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.min_tait.stderr
index b0593d51a25..66e4c242168 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.stderr
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.min_tait.stderr
@@ -1,5 +1,5 @@
 warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/type-alias-impl-trait-const.rs:8:12
+  --> $DIR/type-alias-impl-trait-const.rs:11:12
    |
 LL | #![feature(impl_trait_in_bindings)]
    |            ^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.rs
index 01769f71153..0b0551cd96d 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-const.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // Currently, the `type_alias_impl_trait` feature implicitly
 // depends on `impl_trait_in_bindings` in order to work properly.
 // Specifically, this line requires `impl_trait_in_bindings` to be enabled:
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.full_tait.stderr
new file mode 100644
index 00000000000..fb88c2043bd
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-fns.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs
index a22b12cae6b..a6b00220084 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 // Regression test for issue #61863
 
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.full_tait.stderr
new file mode 100644
index 00000000000..cbecd0bb3d4
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-sized.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.rs
index c54df664243..b062739921f 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-sized.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type A = impl Sized;
 fn f1() -> A { 0 }
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.full_tait.stderr
new file mode 100644
index 00000000000..1a351867bff
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-tuple.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs
index 86c9d482143..ad2c11d4f99 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs
@@ -1,6 +1,9 @@
 // check-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 #![allow(dead_code)]
 
 pub trait MyTrait {}
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.full_tait.stderr
new file mode 100644
index 00000000000..b16d9c2c143
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.full_tait.stderr
@@ -0,0 +1,18 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-unconstrained-lifetime.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/type-alias-impl-trait-unconstrained-lifetime.rs:13:6
+   |
+LL | impl<'a, I: Iterator<Item = i32>> Trait for (i32, I) {
+   |      ^^ unconstrained lifetime parameter
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0207`.
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.min_tait.stderr
similarity index 83%
rename from src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.stderr
rename to src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.min_tait.stderr
index 8cdce2f8e81..7d4abb0fafb 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.stderr
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.min_tait.stderr
@@ -1,5 +1,5 @@
 error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/type-alias-impl-trait-unconstrained-lifetime.rs:10:6
+  --> $DIR/type-alias-impl-trait-unconstrained-lifetime.rs:13:6
    |
 LL | impl<'a, I: Iterator<Item = i32>> Trait for (i32, I) {
    |      ^^ unconstrained lifetime parameter
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.rs
index efbf4f1e351..97294e81dca 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-unconstrained-lifetime.rs
@@ -1,6 +1,9 @@
 // regression test for #74018
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 trait Trait {
     type Associated;
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.full_tait.stderr
new file mode 100644
index 00000000000..e3fd076fc49
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.full_tait.stderr
@@ -0,0 +1,17 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-with-cycle-error.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: could not find defining uses
+  --> $DIR/type-alias-impl-trait-with-cycle-error.rs:6:12
+   |
+LL | type Foo = impl Fn() -> Foo;
+   |            ^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.min_tait.stderr
similarity index 71%
rename from src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.stderr
rename to src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.min_tait.stderr
index 726f4ea6e00..556779574e4 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.stderr
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.min_tait.stderr
@@ -1,5 +1,5 @@
 error: could not find defining uses
-  --> $DIR/type-alias-impl-trait-with-cycle-error.rs:3:12
+  --> $DIR/type-alias-impl-trait-with-cycle-error.rs:6:12
    |
 LL | type Foo = impl Fn() -> Foo;
    |            ^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs
index c009952eab7..dba0d2c2cdf 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Foo = impl Fn() -> Foo;
 //~^ ERROR: could not find defining uses
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.full_tait.stderr
new file mode 100644
index 00000000000..eccf08b4a12
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.full_tait.stderr
@@ -0,0 +1,17 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-with-cycle-error2.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: could not find defining uses
+  --> $DIR/type-alias-impl-trait-with-cycle-error2.rs:10:12
+   |
+LL | type Foo = impl Bar<Foo, Item = Foo>;
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.min_tait.stderr
similarity index 73%
rename from src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.stderr
rename to src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.min_tait.stderr
index 3947cc4d270..44d279cad17 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.stderr
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.min_tait.stderr
@@ -1,5 +1,5 @@
 error: could not find defining uses
-  --> $DIR/type-alias-impl-trait-with-cycle-error2.rs:7:12
+  --> $DIR/type-alias-impl-trait-with-cycle-error2.rs:10:12
    |
 LL | type Foo = impl Bar<Foo, Item = Foo>;
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.rs
index 32ecc366618..f2044037125 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error2.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 pub trait Bar<T> {
     type Item;
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.full_tait.stderr
new file mode 100644
index 00000000000..6ada4b2fdff
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.full_tait.stderr
@@ -0,0 +1,23 @@
+error: at least one trait must be specified
+  --> $DIR/type-alias-impl-trait-with-no-traits.rs:6:12
+   |
+LL | type Foo = impl 'static;
+   |            ^^^^^^^^^^^^
+
+error: at least one trait must be specified
+  --> $DIR/type-alias-impl-trait-with-no-traits.rs:13:13
+   |
+LL | fn bar() -> impl 'static {
+   |             ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait-with-no-traits.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.min_tait.stderr
similarity index 69%
rename from src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.stderr
rename to src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.min_tait.stderr
index 3f7acd33830..5fd8aac5507 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.stderr
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.min_tait.stderr
@@ -1,11 +1,11 @@
 error: at least one trait must be specified
-  --> $DIR/type-alias-impl-trait-with-no-traits.rs:3:12
+  --> $DIR/type-alias-impl-trait-with-no-traits.rs:6:12
    |
 LL | type Foo = impl 'static;
    |            ^^^^^^^^^^^^
 
 error: at least one trait must be specified
-  --> $DIR/type-alias-impl-trait-with-no-traits.rs:10:13
+  --> $DIR/type-alias-impl-trait-with-no-traits.rs:13:13
    |
 LL | fn bar() -> impl 'static {
    |             ^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.rs
index 8ca279eec92..7efc7900588 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-no-traits.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 type Foo = impl 'static;
 //~^ ERROR: at least one trait must be specified
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.full_tait.stderr
new file mode 100644
index 00000000000..8c0f7758dae
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-impl-trait.rs:8:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.rs
index 80192d19af9..6176595534a 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait.rs
@@ -3,7 +3,10 @@
 #![allow(dead_code)]
 #![allow(unused_assignments)]
 #![allow(unused_variables)]
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {
     assert_eq!(foo().to_string(), "foo");
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.full_tait.stderr b/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.full_tait.stderr
new file mode 100644
index 00000000000..ed4fe41da3e
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.full_tait.stderr
@@ -0,0 +1,11 @@
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/type-alias-nested-impl-trait.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+warning: 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.rs b/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.rs
index fd954801dc0..3023bf06562 100644
--- a/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.rs
+++ b/src/test/ui/type-alias-impl-trait/type-alias-nested-impl-trait.rs
@@ -1,6 +1,9 @@
 // run-pass
 
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 use std::iter::{once, Chain};
 
diff --git a/src/test/ui/type-alias-impl-trait/unused_generic_param.full_tait.stderr b/src/test/ui/type-alias-impl-trait/unused_generic_param.full_tait.stderr
new file mode 100644
index 00000000000..b70f36b67ab
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/unused_generic_param.full_tait.stderr
@@ -0,0 +1,23 @@
+error: at least one trait must be specified
+  --> $DIR/unused_generic_param.rs:9:28
+   |
+LL | type PartiallyDefined<T> = impl 'static;
+   |                            ^^^^^^^^^^^^
+
+error: at least one trait must be specified
+  --> $DIR/unused_generic_param.rs:16:29
+   |
+LL | type PartiallyDefined2<T> = impl 'static;
+   |                             ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/unused_generic_param.rs:3:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
diff --git a/src/test/ui/type-alias-impl-trait/unused_generic_param.stderr b/src/test/ui/type-alias-impl-trait/unused_generic_param.min_tait.stderr
similarity index 80%
rename from src/test/ui/type-alias-impl-trait/unused_generic_param.stderr
rename to src/test/ui/type-alias-impl-trait/unused_generic_param.min_tait.stderr
index 9c63701ed33..561025c88f8 100644
--- a/src/test/ui/type-alias-impl-trait/unused_generic_param.stderr
+++ b/src/test/ui/type-alias-impl-trait/unused_generic_param.min_tait.stderr
@@ -1,11 +1,11 @@
 error: at least one trait must be specified
-  --> $DIR/unused_generic_param.rs:6:28
+  --> $DIR/unused_generic_param.rs:9:28
    |
 LL | type PartiallyDefined<T> = impl 'static;
    |                            ^^^^^^^^^^^^
 
 error: at least one trait must be specified
-  --> $DIR/unused_generic_param.rs:13:29
+  --> $DIR/unused_generic_param.rs:16:29
    |
 LL | type PartiallyDefined2<T> = impl 'static;
    |                             ^^^^^^^^^^^^
diff --git a/src/test/ui/type-alias-impl-trait/unused_generic_param.rs b/src/test/ui/type-alias-impl-trait/unused_generic_param.rs
index a9ab727b193..59c7646ade2 100644
--- a/src/test/ui/type-alias-impl-trait/unused_generic_param.rs
+++ b/src/test/ui/type-alias-impl-trait/unused_generic_param.rs
@@ -1,4 +1,7 @@
-#![feature(type_alias_impl_trait)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 
 fn main() {
 }
diff --git a/src/test/ui/typeck/typeck_type_placeholder_item.full_tait.stderr b/src/test/ui/typeck/typeck_type_placeholder_item.full_tait.stderr
new file mode 100644
index 00000000000..75e4cb3e2d8
--- /dev/null
+++ b/src/test/ui/typeck/typeck_type_placeholder_item.full_tait.stderr
@@ -0,0 +1,647 @@
+error: expected identifier, found reserved identifier `_`
+  --> $DIR/typeck_type_placeholder_item.rs:158:18
+   |
+LL | struct BadStruct<_>(_);
+   |                  ^ expected identifier, found reserved identifier
+
+error: expected identifier, found reserved identifier `_`
+  --> $DIR/typeck_type_placeholder_item.rs:161:16
+   |
+LL | trait BadTrait<_> {}
+   |                ^ expected identifier, found reserved identifier
+
+error: expected identifier, found reserved identifier `_`
+  --> $DIR/typeck_type_placeholder_item.rs:171:19
+   |
+LL | struct BadStruct1<_, _>(_);
+   |                   ^ expected identifier, found reserved identifier
+
+error: expected identifier, found reserved identifier `_`
+  --> $DIR/typeck_type_placeholder_item.rs:171:22
+   |
+LL | struct BadStruct1<_, _>(_);
+   |                      ^ expected identifier, found reserved identifier
+
+error: expected identifier, found reserved identifier `_`
+  --> $DIR/typeck_type_placeholder_item.rs:176:19
+   |
+LL | struct BadStruct2<_, T>(_, T);
+   |                   ^ expected identifier, found reserved identifier
+
+error: associated constant in `impl` without body
+  --> $DIR/typeck_type_placeholder_item.rs:209:5
+   |
+LL |     const C: _;
+   |     ^^^^^^^^^^-
+   |               |
+   |               help: provide a definition for the constant: `= <expr>;`
+
+error[E0403]: the name `_` is already used for a generic parameter in this item's generic parameters
+  --> $DIR/typeck_type_placeholder_item.rs:171:22
+   |
+LL | struct BadStruct1<_, _>(_);
+   |                   -  ^ already used
+   |                   |
+   |                   first use of `_`
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/typeck_type_placeholder_item.rs:5:32
+   |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+   |                                ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:10:14
+   |
+LL | fn test() -> _ { 5 }
+   |              ^
+   |              |
+   |              not allowed in type signatures
+   |              help: replace with the correct return type: `i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:13:16
+   |
+LL | fn test2() -> (_, _) { (5, 5) }
+   |               -^--^-
+   |               ||  |
+   |               ||  not allowed in type signatures
+   |               |not allowed in type signatures
+   |               help: replace with the correct return type: `(i32, i32)`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:16:15
+   |
+LL | static TEST3: _ = "test";
+   |               ^
+   |               |
+   |               not allowed in type signatures
+   |               help: replace `_` with the correct type: `&str`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:19:15
+   |
+LL | static TEST4: _ = 145;
+   |               ^
+   |               |
+   |               not allowed in type signatures
+   |               help: replace `_` with the correct type: `i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:22:15
+   |
+LL | static TEST5: (_, _) = (1, 2);
+   |               ^^^^^^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:25:13
+   |
+LL | fn test6(_: _) { }
+   |             ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | fn test6<T>(_: T) { }
+   |         ^^^    ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:28:18
+   |
+LL | fn test6_b<T>(_: _, _: T) { }
+   |                  ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | fn test6_b<T, U>(_: U, _: T) { }
+   |             ^^^     ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:31:30
+   |
+LL | fn test6_c<T, K, L, A, B>(_: _, _: (T, K, L, A, B)) { }
+   |                              ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | fn test6_c<T, K, L, A, B, U>(_: U, _: (T, K, L, A, B)) { }
+   |                         ^^^     ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:34:13
+   |
+LL | fn test7(x: _) { let _x: usize = x; }
+   |             ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | fn test7<T>(x: T) { let _x: usize = x; }
+   |         ^^^    ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:37:22
+   |
+LL | fn test8(_f: fn() -> _) { }
+   |                      ^
+   |                      |
+   |                      not allowed in type signatures
+   |                      help: use type parameters instead: `T`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:37:22
+   |
+LL | fn test8(_f: fn() -> _) { }
+   |                      ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | fn test8<T>(_f: fn() -> T) { }
+   |         ^^^             ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:51:26
+   |
+LL | fn test11(x: &usize) -> &_ {
+   |                         -^
+   |                         ||
+   |                         |not allowed in type signatures
+   |                         help: replace with the correct return type: `&'static &'static usize`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:56:52
+   |
+LL | unsafe fn test12(x: *const usize) -> *const *const _ {
+   |                                      --------------^
+   |                                      |             |
+   |                                      |             not allowed in type signatures
+   |                                      help: replace with the correct return type: `*const *const usize`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:70:8
+   |
+LL |     a: _,
+   |        ^ not allowed in type signatures
+LL |
+LL |     b: (_, _),
+   |         ^  ^ not allowed in type signatures
+   |         |
+   |         not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | struct Test10<T> {
+LL |     a: T,
+LL |
+LL |     b: (T, T),
+   |
+
+error: missing type for `static` item
+  --> $DIR/typeck_type_placeholder_item.rs:76:12
+   |
+LL |     static A = 42;
+   |            ^ help: provide a type for the item: `A: i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:78:15
+   |
+LL |     static B: _ = 42;
+   |               ^
+   |               |
+   |               not allowed in type signatures
+   |               help: replace `_` with the correct type: `i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:80:15
+   |
+LL |     static C: Option<_> = Some(42);
+   |               ^^^^^^^^^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:83:21
+   |
+LL |     fn fn_test() -> _ { 5 }
+   |                     ^
+   |                     |
+   |                     not allowed in type signatures
+   |                     help: replace with the correct return type: `i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:86:23
+   |
+LL |     fn fn_test2() -> (_, _) { (5, 5) }
+   |                      -^--^-
+   |                      ||  |
+   |                      ||  not allowed in type signatures
+   |                      |not allowed in type signatures
+   |                      help: replace with the correct return type: `(i32, i32)`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:89:22
+   |
+LL |     static FN_TEST3: _ = "test";
+   |                      ^
+   |                      |
+   |                      not allowed in type signatures
+   |                      help: replace `_` with the correct type: `&str`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:92:22
+   |
+LL |     static FN_TEST4: _ = 145;
+   |                      ^
+   |                      |
+   |                      not allowed in type signatures
+   |                      help: replace `_` with the correct type: `i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:95:22
+   |
+LL |     static FN_TEST5: (_, _) = (1, 2);
+   |                      ^^^^^^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:98:20
+   |
+LL |     fn fn_test6(_: _) { }
+   |                    ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn fn_test6<T>(_: T) { }
+   |                ^^^    ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:101:20
+   |
+LL |     fn fn_test7(x: _) { let _x: usize = x; }
+   |                    ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn fn_test7<T>(x: T) { let _x: usize = x; }
+   |                ^^^    ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:104:29
+   |
+LL |     fn fn_test8(_f: fn() -> _) { }
+   |                             ^
+   |                             |
+   |                             not allowed in type signatures
+   |                             help: use type parameters instead: `T`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:104:29
+   |
+LL |     fn fn_test8(_f: fn() -> _) { }
+   |                             ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn fn_test8<T>(_f: fn() -> T) { }
+   |                ^^^             ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:127:12
+   |
+LL |         a: _,
+   |            ^ not allowed in type signatures
+LL |
+LL |         b: (_, _),
+   |             ^  ^ not allowed in type signatures
+   |             |
+   |             not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     struct FnTest10<T> {
+LL |         a: T,
+LL |
+LL |         b: (T, T),
+   |
+
+error[E0282]: type annotations needed
+  --> $DIR/typeck_type_placeholder_item.rs:132:18
+   |
+LL |     fn fn_test11(_: _) -> (_, _) { panic!() }
+   |                  ^ cannot infer type
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:132:28
+   |
+LL |     fn fn_test11(_: _) -> (_, _) { panic!() }
+   |                            ^  ^ not allowed in type signatures
+   |                            |
+   |                            not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:136:30
+   |
+LL |     fn fn_test12(x: i32) -> (_, _) { (x, x) }
+   |                             -^--^-
+   |                             ||  |
+   |                             ||  not allowed in type signatures
+   |                             |not allowed in type signatures
+   |                             help: replace with the correct return type: `(i32, i32)`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:139:33
+   |
+LL |     fn fn_test13(x: _) -> (i32, _) { (x, x) }
+   |                           ------^-
+   |                           |     |
+   |                           |     not allowed in type signatures
+   |                           help: replace with the correct return type: `(i32, i32)`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:158:21
+   |
+LL | struct BadStruct<_>(_);
+   |                     ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | struct BadStruct<T>(T);
+   |                  ^  ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:163:15
+   |
+LL | impl BadTrait<_> for BadStruct<_> {}
+   |               ^                ^ not allowed in type signatures
+   |               |
+   |               not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | impl<T> BadTrait<T> for BadStruct<T> {}
+   |     ^^^          ^                ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:166:34
+   |
+LL | fn impl_trait() -> impl BadTrait<_> {
+   |                                  ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:171:25
+   |
+LL | struct BadStruct1<_, _>(_);
+   |                         ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | struct BadStruct1<T, _>(T);
+   |                   ^     ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:176:25
+   |
+LL | struct BadStruct2<_, T>(_, T);
+   |                         ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | struct BadStruct2<U, T>(U, T);
+   |                   ^     ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:180:14
+   |
+LL | type X = Box<_>;
+   |              ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:186:21
+   |
+LL | type Y = impl Trait<_>;
+   |                     ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:220:31
+   |
+LL | fn value() -> Option<&'static _> {
+   |               ----------------^-
+   |               |               |
+   |               |               not allowed in type signatures
+   |               help: replace with the correct return type: `Option<&'static u8>`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:225:10
+   |
+LL | const _: Option<_> = map(value);
+   |          ^^^^^^^^^
+   |          |
+   |          not allowed in type signatures
+   |          help: replace `_` with the correct type: `Option<u8>`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:144:31
+   |
+LL |     fn method_test1(&self, x: _);
+   |                               ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn method_test1<T>(&self, x: T);
+   |                    ^^^           ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:146:31
+   |
+LL |     fn method_test2(&self, x: _) -> _;
+   |                               ^     ^ not allowed in type signatures
+   |                               |
+   |                               not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn method_test2<T>(&self, x: T) -> T;
+   |                    ^^^           ^     ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:148:31
+   |
+LL |     fn method_test3(&self) -> _;
+   |                               ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn method_test3<T>(&self) -> T;
+   |                    ^^^           ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:150:26
+   |
+LL |     fn assoc_fn_test1(x: _);
+   |                          ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn assoc_fn_test1<T>(x: T);
+   |                      ^^^    ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:152:26
+   |
+LL |     fn assoc_fn_test2(x: _) -> _;
+   |                          ^     ^ not allowed in type signatures
+   |                          |
+   |                          not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn assoc_fn_test2<T>(x: T) -> T;
+   |                      ^^^    ^     ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:154:28
+   |
+LL |     fn assoc_fn_test3() -> _;
+   |                            ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn assoc_fn_test3<T>() -> T;
+   |                      ^^^      ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:194:14
+   |
+LL |     type B = _;
+   |              ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:196:14
+   |
+LL |     const C: _;
+   |              ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:198:14
+   |
+LL |     const D: _ = 42;
+   |              ^
+   |              |
+   |              not allowed in type signatures
+   |              help: replace `_` with the correct type: `i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:201:26
+   |
+LL |     type F: std::ops::Fn(_);
+   |                          ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:44:24
+   |
+LL |     fn test9(&self) -> _ { () }
+   |                        ^
+   |                        |
+   |                        not allowed in type signatures
+   |                        help: replace with the correct return type: `()`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:47:27
+   |
+LL |     fn test10(&self, _x : _) { }
+   |                           ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn test10<T>(&self, _x : T) { }
+   |              ^^^             ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:62:24
+   |
+LL |     fn clone(&self) -> _ { Test9 }
+   |                        ^
+   |                        |
+   |                        not allowed in type signatures
+   |                        help: replace with the correct return type: `Test9`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:65:37
+   |
+LL |     fn clone_from(&mut self, other: _) { *self = Test9; }
+   |                                     ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |     fn clone_from<T>(&mut self, other: T) { *self = Test9; }
+   |                  ^^^                   ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:111:31
+   |
+LL |         fn fn_test9(&self) -> _ { () }
+   |                               ^
+   |                               |
+   |                               not allowed in type signatures
+   |                               help: replace with the correct return type: `()`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:114:34
+   |
+LL |         fn fn_test10(&self, _x : _) { }
+   |                                  ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |         fn fn_test10<T>(&self, _x : T) { }
+   |                     ^^^             ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:119:28
+   |
+LL |         fn clone(&self) -> _ { FnTest9 }
+   |                            ^
+   |                            |
+   |                            not allowed in type signatures
+   |                            help: replace with the correct return type: `FnTest9`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:122:41
+   |
+LL |         fn clone_from(&mut self, other: _) { *self = FnTest9; }
+   |                                         ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL |         fn clone_from<T>(&mut self, other: T) { *self = FnTest9; }
+   |                      ^^^                   ^
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:205:14
+   |
+LL |     type A = _;
+   |              ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:207:14
+   |
+LL |     type B = _;
+   |              ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:209:14
+   |
+LL |     const C: _;
+   |              ^ not allowed in type signatures
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/typeck_type_placeholder_item.rs:212:14
+   |
+LL |     const D: _ = 42;
+   |              ^
+   |              |
+   |              not allowed in type signatures
+   |              help: replace `_` with the correct type: `i32`
+
+error: aborting due to 69 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0121, E0282, E0403.
+For more information about an error, try `rustc --explain E0121`.
diff --git a/src/test/ui/typeck/typeck_type_placeholder_item.stderr b/src/test/ui/typeck/typeck_type_placeholder_item.min_tait.stderr
similarity index 86%
rename from src/test/ui/typeck/typeck_type_placeholder_item.stderr
rename to src/test/ui/typeck/typeck_type_placeholder_item.min_tait.stderr
index 1034402bfb0..c6758c52a91 100644
--- a/src/test/ui/typeck/typeck_type_placeholder_item.stderr
+++ b/src/test/ui/typeck/typeck_type_placeholder_item.min_tait.stderr
@@ -1,35 +1,35 @@
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/typeck_type_placeholder_item.rs:154:18
+  --> $DIR/typeck_type_placeholder_item.rs:158:18
    |
 LL | struct BadStruct<_>(_);
    |                  ^ expected identifier, found reserved identifier
 
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/typeck_type_placeholder_item.rs:157:16
+  --> $DIR/typeck_type_placeholder_item.rs:161:16
    |
 LL | trait BadTrait<_> {}
    |                ^ expected identifier, found reserved identifier
 
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/typeck_type_placeholder_item.rs:167:19
+  --> $DIR/typeck_type_placeholder_item.rs:171:19
    |
 LL | struct BadStruct1<_, _>(_);
    |                   ^ expected identifier, found reserved identifier
 
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/typeck_type_placeholder_item.rs:167:22
+  --> $DIR/typeck_type_placeholder_item.rs:171:22
    |
 LL | struct BadStruct1<_, _>(_);
    |                      ^ expected identifier, found reserved identifier
 
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/typeck_type_placeholder_item.rs:172:19
+  --> $DIR/typeck_type_placeholder_item.rs:176:19
    |
 LL | struct BadStruct2<_, T>(_, T);
    |                   ^ expected identifier, found reserved identifier
 
 error: associated constant in `impl` without body
-  --> $DIR/typeck_type_placeholder_item.rs:205:5
+  --> $DIR/typeck_type_placeholder_item.rs:209:5
    |
 LL |     const C: _;
    |     ^^^^^^^^^^-
@@ -37,7 +37,7 @@ LL |     const C: _;
    |               help: provide a definition for the constant: `= <expr>;`
 
 error[E0403]: the name `_` is already used for a generic parameter in this item's generic parameters
-  --> $DIR/typeck_type_placeholder_item.rs:167:22
+  --> $DIR/typeck_type_placeholder_item.rs:171:22
    |
 LL | struct BadStruct1<_, _>(_);
    |                   -  ^ already used
@@ -45,7 +45,7 @@ LL | struct BadStruct1<_, _>(_);
    |                   first use of `_`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:6:14
+  --> $DIR/typeck_type_placeholder_item.rs:10:14
    |
 LL | fn test() -> _ { 5 }
    |              ^
@@ -54,7 +54,7 @@ LL | fn test() -> _ { 5 }
    |              help: replace with the correct return type: `i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:9:16
+  --> $DIR/typeck_type_placeholder_item.rs:13:16
    |
 LL | fn test2() -> (_, _) { (5, 5) }
    |               -^--^-
@@ -64,7 +64,7 @@ LL | fn test2() -> (_, _) { (5, 5) }
    |               help: replace with the correct return type: `(i32, i32)`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:12:15
+  --> $DIR/typeck_type_placeholder_item.rs:16:15
    |
 LL | static TEST3: _ = "test";
    |               ^
@@ -73,7 +73,7 @@ LL | static TEST3: _ = "test";
    |               help: replace `_` with the correct type: `&str`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:15:15
+  --> $DIR/typeck_type_placeholder_item.rs:19:15
    |
 LL | static TEST4: _ = 145;
    |               ^
@@ -82,13 +82,13 @@ LL | static TEST4: _ = 145;
    |               help: replace `_` with the correct type: `i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:18:15
+  --> $DIR/typeck_type_placeholder_item.rs:22:15
    |
 LL | static TEST5: (_, _) = (1, 2);
    |               ^^^^^^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:21:13
+  --> $DIR/typeck_type_placeholder_item.rs:25:13
    |
 LL | fn test6(_: _) { }
    |             ^ not allowed in type signatures
@@ -99,7 +99,7 @@ LL | fn test6<T>(_: T) { }
    |         ^^^    ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:24:18
+  --> $DIR/typeck_type_placeholder_item.rs:28:18
    |
 LL | fn test6_b<T>(_: _, _: T) { }
    |                  ^ not allowed in type signatures
@@ -110,7 +110,7 @@ LL | fn test6_b<T, U>(_: U, _: T) { }
    |             ^^^     ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:27:30
+  --> $DIR/typeck_type_placeholder_item.rs:31:30
    |
 LL | fn test6_c<T, K, L, A, B>(_: _, _: (T, K, L, A, B)) { }
    |                              ^ not allowed in type signatures
@@ -121,7 +121,7 @@ LL | fn test6_c<T, K, L, A, B, U>(_: U, _: (T, K, L, A, B)) { }
    |                         ^^^     ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:30:13
+  --> $DIR/typeck_type_placeholder_item.rs:34:13
    |
 LL | fn test7(x: _) { let _x: usize = x; }
    |             ^ not allowed in type signatures
@@ -132,7 +132,7 @@ LL | fn test7<T>(x: T) { let _x: usize = x; }
    |         ^^^    ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:33:22
+  --> $DIR/typeck_type_placeholder_item.rs:37:22
    |
 LL | fn test8(_f: fn() -> _) { }
    |                      ^
@@ -141,7 +141,7 @@ LL | fn test8(_f: fn() -> _) { }
    |                      help: use type parameters instead: `T`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:33:22
+  --> $DIR/typeck_type_placeholder_item.rs:37:22
    |
 LL | fn test8(_f: fn() -> _) { }
    |                      ^ not allowed in type signatures
@@ -152,7 +152,7 @@ LL | fn test8<T>(_f: fn() -> T) { }
    |         ^^^             ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:47:26
+  --> $DIR/typeck_type_placeholder_item.rs:51:26
    |
 LL | fn test11(x: &usize) -> &_ {
    |                         -^
@@ -161,7 +161,7 @@ LL | fn test11(x: &usize) -> &_ {
    |                         help: replace with the correct return type: `&'static &'static usize`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:52:52
+  --> $DIR/typeck_type_placeholder_item.rs:56:52
    |
 LL | unsafe fn test12(x: *const usize) -> *const *const _ {
    |                                      --------------^
@@ -170,7 +170,7 @@ LL | unsafe fn test12(x: *const usize) -> *const *const _ {
    |                                      help: replace with the correct return type: `*const *const usize`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:66:8
+  --> $DIR/typeck_type_placeholder_item.rs:70:8
    |
 LL |     a: _,
    |        ^ not allowed in type signatures
@@ -189,13 +189,13 @@ LL |     b: (T, T),
    |
 
 error: missing type for `static` item
-  --> $DIR/typeck_type_placeholder_item.rs:72:12
+  --> $DIR/typeck_type_placeholder_item.rs:76:12
    |
 LL |     static A = 42;
    |            ^ help: provide a type for the item: `A: i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:74:15
+  --> $DIR/typeck_type_placeholder_item.rs:78:15
    |
 LL |     static B: _ = 42;
    |               ^
@@ -204,13 +204,13 @@ LL |     static B: _ = 42;
    |               help: replace `_` with the correct type: `i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:76:15
+  --> $DIR/typeck_type_placeholder_item.rs:80:15
    |
 LL |     static C: Option<_> = Some(42);
    |               ^^^^^^^^^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:79:21
+  --> $DIR/typeck_type_placeholder_item.rs:83:21
    |
 LL |     fn fn_test() -> _ { 5 }
    |                     ^
@@ -219,7 +219,7 @@ LL |     fn fn_test() -> _ { 5 }
    |                     help: replace with the correct return type: `i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:82:23
+  --> $DIR/typeck_type_placeholder_item.rs:86:23
    |
 LL |     fn fn_test2() -> (_, _) { (5, 5) }
    |                      -^--^-
@@ -229,7 +229,7 @@ LL |     fn fn_test2() -> (_, _) { (5, 5) }
    |                      help: replace with the correct return type: `(i32, i32)`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:85:22
+  --> $DIR/typeck_type_placeholder_item.rs:89:22
    |
 LL |     static FN_TEST3: _ = "test";
    |                      ^
@@ -238,7 +238,7 @@ LL |     static FN_TEST3: _ = "test";
    |                      help: replace `_` with the correct type: `&str`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:88:22
+  --> $DIR/typeck_type_placeholder_item.rs:92:22
    |
 LL |     static FN_TEST4: _ = 145;
    |                      ^
@@ -247,13 +247,13 @@ LL |     static FN_TEST4: _ = 145;
    |                      help: replace `_` with the correct type: `i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:91:22
+  --> $DIR/typeck_type_placeholder_item.rs:95:22
    |
 LL |     static FN_TEST5: (_, _) = (1, 2);
    |                      ^^^^^^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:94:20
+  --> $DIR/typeck_type_placeholder_item.rs:98:20
    |
 LL |     fn fn_test6(_: _) { }
    |                    ^ not allowed in type signatures
@@ -264,7 +264,7 @@ LL |     fn fn_test6<T>(_: T) { }
    |                ^^^    ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:97:20
+  --> $DIR/typeck_type_placeholder_item.rs:101:20
    |
 LL |     fn fn_test7(x: _) { let _x: usize = x; }
    |                    ^ not allowed in type signatures
@@ -275,7 +275,7 @@ LL |     fn fn_test7<T>(x: T) { let _x: usize = x; }
    |                ^^^    ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:100:29
+  --> $DIR/typeck_type_placeholder_item.rs:104:29
    |
 LL |     fn fn_test8(_f: fn() -> _) { }
    |                             ^
@@ -284,7 +284,7 @@ LL |     fn fn_test8(_f: fn() -> _) { }
    |                             help: use type parameters instead: `T`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:100:29
+  --> $DIR/typeck_type_placeholder_item.rs:104:29
    |
 LL |     fn fn_test8(_f: fn() -> _) { }
    |                             ^ not allowed in type signatures
@@ -295,7 +295,7 @@ LL |     fn fn_test8<T>(_f: fn() -> T) { }
    |                ^^^             ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:123:12
+  --> $DIR/typeck_type_placeholder_item.rs:127:12
    |
 LL |         a: _,
    |            ^ not allowed in type signatures
@@ -314,13 +314,13 @@ LL |         b: (T, T),
    |
 
 error[E0282]: type annotations needed
-  --> $DIR/typeck_type_placeholder_item.rs:128:18
+  --> $DIR/typeck_type_placeholder_item.rs:132:18
    |
 LL |     fn fn_test11(_: _) -> (_, _) { panic!() }
    |                  ^ cannot infer type
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:128:28
+  --> $DIR/typeck_type_placeholder_item.rs:132:28
    |
 LL |     fn fn_test11(_: _) -> (_, _) { panic!() }
    |                            ^  ^ not allowed in type signatures
@@ -328,7 +328,7 @@ LL |     fn fn_test11(_: _) -> (_, _) { panic!() }
    |                            not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:132:30
+  --> $DIR/typeck_type_placeholder_item.rs:136:30
    |
 LL |     fn fn_test12(x: i32) -> (_, _) { (x, x) }
    |                             -^--^-
@@ -338,7 +338,7 @@ LL |     fn fn_test12(x: i32) -> (_, _) { (x, x) }
    |                             help: replace with the correct return type: `(i32, i32)`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:135:33
+  --> $DIR/typeck_type_placeholder_item.rs:139:33
    |
 LL |     fn fn_test13(x: _) -> (i32, _) { (x, x) }
    |                           ------^-
@@ -347,7 +347,7 @@ LL |     fn fn_test13(x: _) -> (i32, _) { (x, x) }
    |                           help: replace with the correct return type: `(i32, i32)`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:154:21
+  --> $DIR/typeck_type_placeholder_item.rs:158:21
    |
 LL | struct BadStruct<_>(_);
    |                     ^ not allowed in type signatures
@@ -358,7 +358,7 @@ LL | struct BadStruct<T>(T);
    |                  ^  ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:159:15
+  --> $DIR/typeck_type_placeholder_item.rs:163:15
    |
 LL | impl BadTrait<_> for BadStruct<_> {}
    |               ^                ^ not allowed in type signatures
@@ -371,13 +371,13 @@ LL | impl<T> BadTrait<T> for BadStruct<T> {}
    |     ^^^          ^                ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:162:34
+  --> $DIR/typeck_type_placeholder_item.rs:166:34
    |
 LL | fn impl_trait() -> impl BadTrait<_> {
    |                                  ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:167:25
+  --> $DIR/typeck_type_placeholder_item.rs:171:25
    |
 LL | struct BadStruct1<_, _>(_);
    |                         ^ not allowed in type signatures
@@ -388,7 +388,7 @@ LL | struct BadStruct1<T, _>(T);
    |                   ^     ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:172:25
+  --> $DIR/typeck_type_placeholder_item.rs:176:25
    |
 LL | struct BadStruct2<_, T>(_, T);
    |                         ^ not allowed in type signatures
@@ -399,19 +399,19 @@ LL | struct BadStruct2<U, T>(U, T);
    |                   ^     ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:176:14
+  --> $DIR/typeck_type_placeholder_item.rs:180:14
    |
 LL | type X = Box<_>;
    |              ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:182:21
+  --> $DIR/typeck_type_placeholder_item.rs:186:21
    |
 LL | type Y = impl Trait<_>;
    |                     ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:216:31
+  --> $DIR/typeck_type_placeholder_item.rs:220:31
    |
 LL | fn value() -> Option<&'static _> {
    |               ----------------^-
@@ -420,7 +420,7 @@ LL | fn value() -> Option<&'static _> {
    |               help: replace with the correct return type: `Option<&'static u8>`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:221:10
+  --> $DIR/typeck_type_placeholder_item.rs:225:10
    |
 LL | const _: Option<_> = map(value);
    |          ^^^^^^^^^
@@ -429,7 +429,7 @@ LL | const _: Option<_> = map(value);
    |          help: replace `_` with the correct type: `Option<u8>`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:140:31
+  --> $DIR/typeck_type_placeholder_item.rs:144:31
    |
 LL |     fn method_test1(&self, x: _);
    |                               ^ not allowed in type signatures
@@ -440,7 +440,7 @@ LL |     fn method_test1<T>(&self, x: T);
    |                    ^^^           ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:142:31
+  --> $DIR/typeck_type_placeholder_item.rs:146:31
    |
 LL |     fn method_test2(&self, x: _) -> _;
    |                               ^     ^ not allowed in type signatures
@@ -453,7 +453,7 @@ LL |     fn method_test2<T>(&self, x: T) -> T;
    |                    ^^^           ^     ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:144:31
+  --> $DIR/typeck_type_placeholder_item.rs:148:31
    |
 LL |     fn method_test3(&self) -> _;
    |                               ^ not allowed in type signatures
@@ -464,7 +464,7 @@ LL |     fn method_test3<T>(&self) -> T;
    |                    ^^^           ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:146:26
+  --> $DIR/typeck_type_placeholder_item.rs:150:26
    |
 LL |     fn assoc_fn_test1(x: _);
    |                          ^ not allowed in type signatures
@@ -475,7 +475,7 @@ LL |     fn assoc_fn_test1<T>(x: T);
    |                      ^^^    ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:148:26
+  --> $DIR/typeck_type_placeholder_item.rs:152:26
    |
 LL |     fn assoc_fn_test2(x: _) -> _;
    |                          ^     ^ not allowed in type signatures
@@ -488,7 +488,7 @@ LL |     fn assoc_fn_test2<T>(x: T) -> T;
    |                      ^^^    ^     ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:150:28
+  --> $DIR/typeck_type_placeholder_item.rs:154:28
    |
 LL |     fn assoc_fn_test3() -> _;
    |                            ^ not allowed in type signatures
@@ -499,19 +499,19 @@ LL |     fn assoc_fn_test3<T>() -> T;
    |                      ^^^      ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:190:14
+  --> $DIR/typeck_type_placeholder_item.rs:194:14
    |
 LL |     type B = _;
    |              ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:192:14
+  --> $DIR/typeck_type_placeholder_item.rs:196:14
    |
 LL |     const C: _;
    |              ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:194:14
+  --> $DIR/typeck_type_placeholder_item.rs:198:14
    |
 LL |     const D: _ = 42;
    |              ^
@@ -520,13 +520,13 @@ LL |     const D: _ = 42;
    |              help: replace `_` with the correct type: `i32`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:197:26
+  --> $DIR/typeck_type_placeholder_item.rs:201:26
    |
 LL |     type F: std::ops::Fn(_);
    |                          ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:40:24
+  --> $DIR/typeck_type_placeholder_item.rs:44:24
    |
 LL |     fn test9(&self) -> _ { () }
    |                        ^
@@ -535,7 +535,7 @@ LL |     fn test9(&self) -> _ { () }
    |                        help: replace with the correct return type: `()`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:43:27
+  --> $DIR/typeck_type_placeholder_item.rs:47:27
    |
 LL |     fn test10(&self, _x : _) { }
    |                           ^ not allowed in type signatures
@@ -546,7 +546,7 @@ LL |     fn test10<T>(&self, _x : T) { }
    |              ^^^             ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:58:24
+  --> $DIR/typeck_type_placeholder_item.rs:62:24
    |
 LL |     fn clone(&self) -> _ { Test9 }
    |                        ^
@@ -555,7 +555,7 @@ LL |     fn clone(&self) -> _ { Test9 }
    |                        help: replace with the correct return type: `Test9`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:61:37
+  --> $DIR/typeck_type_placeholder_item.rs:65:37
    |
 LL |     fn clone_from(&mut self, other: _) { *self = Test9; }
    |                                     ^ not allowed in type signatures
@@ -566,7 +566,7 @@ LL |     fn clone_from<T>(&mut self, other: T) { *self = Test9; }
    |                  ^^^                   ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:107:31
+  --> $DIR/typeck_type_placeholder_item.rs:111:31
    |
 LL |         fn fn_test9(&self) -> _ { () }
    |                               ^
@@ -575,7 +575,7 @@ LL |         fn fn_test9(&self) -> _ { () }
    |                               help: replace with the correct return type: `()`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:110:34
+  --> $DIR/typeck_type_placeholder_item.rs:114:34
    |
 LL |         fn fn_test10(&self, _x : _) { }
    |                                  ^ not allowed in type signatures
@@ -586,7 +586,7 @@ LL |         fn fn_test10<T>(&self, _x : T) { }
    |                     ^^^             ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:115:28
+  --> $DIR/typeck_type_placeholder_item.rs:119:28
    |
 LL |         fn clone(&self) -> _ { FnTest9 }
    |                            ^
@@ -595,7 +595,7 @@ LL |         fn clone(&self) -> _ { FnTest9 }
    |                            help: replace with the correct return type: `FnTest9`
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:118:41
+  --> $DIR/typeck_type_placeholder_item.rs:122:41
    |
 LL |         fn clone_from(&mut self, other: _) { *self = FnTest9; }
    |                                         ^ not allowed in type signatures
@@ -606,25 +606,25 @@ LL |         fn clone_from<T>(&mut self, other: T) { *self = FnTest9; }
    |                      ^^^                   ^
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:201:14
+  --> $DIR/typeck_type_placeholder_item.rs:205:14
    |
 LL |     type A = _;
    |              ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:203:14
+  --> $DIR/typeck_type_placeholder_item.rs:207:14
    |
 LL |     type B = _;
    |              ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:205:14
+  --> $DIR/typeck_type_placeholder_item.rs:209:14
    |
 LL |     const C: _;
    |              ^ not allowed in type signatures
 
 error[E0121]: the type placeholder `_` is not allowed within types on item signatures
-  --> $DIR/typeck_type_placeholder_item.rs:208:14
+  --> $DIR/typeck_type_placeholder_item.rs:212:14
    |
 LL |     const D: _ = 42;
    |              ^
diff --git a/src/test/ui/typeck/typeck_type_placeholder_item.rs b/src/test/ui/typeck/typeck_type_placeholder_item.rs
index 2523362fdc4..8a52556ed34 100644
--- a/src/test/ui/typeck/typeck_type_placeholder_item.rs
+++ b/src/test/ui/typeck/typeck_type_placeholder_item.rs
@@ -1,5 +1,9 @@
 // Needed for `type Y = impl Trait<_>` and `type B = _;`
-#![feature(type_alias_impl_trait, associated_type_defaults)]
+#![feature(associated_type_defaults)]
+// revisions: min_tait full_tait
+#![feature(min_type_alias_impl_trait)]
+#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+//[full_tait]~^ WARN incomplete
 // This test checks that it is not possible to enable global type
 // inference by using the `_` type placeholder.