Restrict most uses of const_fn to min_const_fn

src/liballoc/lib.rs

@@ -88,7 +88,8 @@
 #![feature(box_syntax)]
 #![feature(cfg_target_has_atomic)]
 #![feature(coerce_unsized)]
-#![feature(const_fn)]
+#![cfg_attr(stage0, feature(const_fn))]
+#![cfg_attr(not(stage0), feature(min_const_fn))]
 #![feature(core_intrinsics)]
 #![feature(custom_attribute)]
 #![feature(dropck_eyepatch)]

src/liballoc/tests/lib.rs

@@ -11,7 +11,8 @@
 #![feature(allocator_api)]
 #![feature(alloc_system)]
 #![feature(box_syntax)]
-#![feature(const_fn)]
+#![cfg_attr(stage0, feature(const_fn))]
+#![cfg_attr(not(stage0), feature(min_const_fn))]
 #![feature(drain_filter)]
 #![feature(exact_size_is_empty)]
 #![feature(pattern)]

src/librustc/lib.rs

@@ -42,7 +42,8 @@
 
 #![feature(box_patterns)]
 #![feature(box_syntax)]
-#![feature(const_fn)]
+#![cfg_attr(stage0, feature(const_fn))]
+#![cfg_attr(not(stage0), feature(min_const_fn))]
 #![feature(core_intrinsics)]
 #![feature(drain_filter)]
 #![cfg_attr(windows, feature(libc))]

src/librustc_mir/lib.rs

@@ -23,7 +23,6 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(crate_visibility_modifier)]
-#![feature(const_fn)]
 #![feature(core_intrinsics)]
 #![feature(decl_macro)]
 #![cfg_attr(stage0, feature(macro_vis_matcher))]

src/librustc_target/lib.rs

@@ -22,7 +22,8 @@
       html_root_url = "https://doc.rust-lang.org/nightly/")]
 
 #![feature(box_syntax)]
-#![feature(const_fn)]
+#![cfg_attr(stage0, feature(const_fn))]
+#![cfg_attr(not(stage0), feature(min_const_fn))]
 #![cfg_attr(not(stage0), feature(nll))]
 #![cfg_attr(not(stage0), feature(infer_outlives_requirements))]
 #![feature(slice_patterns)]

src/test/codegen-units/item-collection/unreferenced-const-fn.rs

@@ -13,7 +13,7 @@
 
 // NB: We do not expect *any* monomorphization to be generated here.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 #![deny(dead_code)]
 #![crate_type = "rlib"]
 

src/test/codegen/link-dead-code.rs

@@ -10,7 +10,7 @@
 
 // compile-flags:-Clink-dead-code
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 #![crate_type = "rlib"]
 
 // This test makes sure that, when -Clink-dead-code is specified, we generate

src/test/compile-fail/issue-43733-2.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 #![feature(cfg_target_thread_local, thread_local_internals)]
 
 // On platforms *without* `#[thread_local]`, use

src/test/mir-opt/lower_128bit_debug_test.rs

@@ -15,7 +15,7 @@
 
 // compile-flags: -Z lower_128bit_ops=yes -C debug_assertions=yes
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 static TEST_SIGNED: i128 = const_signed(-222);
 static TEST_UNSIGNED: u128 = const_unsigned(200);

src/test/mir-opt/lower_128bit_test.rs

@@ -12,7 +12,7 @@
 
 // compile-flags: -Z lower_128bit_ops=yes -C debug_assertions=no -O
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 static TEST_SIGNED: i128 = const_signed(-222);
 static TEST_UNSIGNED: u128 = const_unsigned(200);

src/test/run-fail/issue-29798.rs

@@ -10,7 +10,7 @@
 
 // error-pattern:index out of bounds: the len is 5 but the index is 5
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 const fn test(x: usize) -> i32 {
     [42;5][x]
 }

src/test/run-pass/auxiliary/const_fn_lib.rs

@@ -11,6 +11,6 @@
 // Crate that exports a const fn. Used for testing cross-crate.
 
 #![crate_type="rlib"]
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 pub const fn foo() -> usize { 22 }

src/test/run-pass/auxiliary/issue-36954.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 #![crate_type = "lib"]
 
 const fn foo(i: i32) -> i32 {

src/test/run-pass/const-fn-const-eval.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const fn add(x: usize, y: usize) -> usize {
     x + y

src/test/run-pass/const-fn-method.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 struct Foo { value: u32 }
 

src/test/run-pass/const-fn-nested.rs

@@ -10,7 +10,7 @@
 
 // Test a call whose argument is the result of another call.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const fn sub(x: u32, y: u32) -> u32 {
     x - y

src/test/run-pass/const-meth-pattern.rs

@@ -7,7 +7,7 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 struct A;
 

src/test/run-pass/const-pattern-variant.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 #[derive(PartialEq, Eq)]
 enum Cake {

src/test/run-pass/const-size_of-align_of.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 use std::mem;
 

src/test/run-pass/const-unsafe-fn.rs

@@ -10,7 +10,7 @@
 
 // A quick test of 'unsafe const fn' functionality
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const unsafe fn dummy(v: u32) -> u32 {
     !v

src/test/run-pass/consts-in-patterns.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const FOO: isize = 10;
 const BAR: isize = 3;

src/test/run-pass/ctfe/ice-48279.rs

@@ -10,7 +10,7 @@
 
 // https://github.com/rust-lang/rust/issues/48279
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 #[derive(PartialEq, Eq)]
 pub struct NonZeroU32 {

src/test/run-pass/ctfe/match-const-fn-structs.rs

@@ -10,7 +10,7 @@
 
 // https://github.com/rust-lang/rust/issues/46114
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 #[derive(Eq, PartialEq)]
 struct A { value: u32 }

src/test/run-pass/ctfe/return-in-const-fn.rs

@@ -10,7 +10,7 @@
 
 // https://github.com/rust-lang/rust/issues/43754
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 const fn foo(x: usize) -> usize {
     return x;
 }

src/test/run-pass/issue-28822.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 fn main() {}
 

src/test/run-pass/issue-29927.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 struct A {
     field: usize,
 }

src/test/run-pass/issue-33537.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const fn foo() -> *const i8 {
     b"foo" as *const _ as *const i8

src/test/run-pass/issue-37991.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const fn foo() -> i64 {
     3

src/test/run-pass/issue29927-1.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 const fn f() -> usize {
     5
 }

src/test/rustdoc/auxiliary/issue-27362.rs

@@ -10,7 +10,7 @@
 
 // compile-flags: -Cmetadata=aux
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 pub const fn foo() {}
 pub const unsafe fn bar() {}

src/test/rustdoc/const-fn.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 #![crate_name = "foo"]
 
 // @has foo/fn.bar.html

src/test/rustdoc/const.rs

@@ -10,7 +10,7 @@
 
 #![crate_type="lib"]
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 pub struct Foo;
 

src/test/ui/borrowck/move-in-static-initializer-issue-38520.rs

@@ -15,7 +15,7 @@
 // permitted as `Foo` is not copy (even in a static/const
 // initializer).
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 struct Foo(usize);
 

src/test/ui/consts/auxiliary/const_fn_lib.rs

@@ -11,6 +11,6 @@
 // Crate that exports a const fn. Used for testing cross-crate.
 
 #![crate_type="rlib"]
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 pub const fn foo() -> usize { 22 } //~ ERROR const fn is unstable

src/test/ui/consts/const-eval/issue-43197.rs

@@ -10,7 +10,7 @@
 
 #![warn(const_err)]
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const fn foo(x: u32) -> u32 {
     x

src/test/ui/consts/const-eval/issue-47971.rs

@@ -10,7 +10,7 @@
 
 // compile-pass
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 struct S(pub &'static u32, pub u32);
 

src/test/ui/consts/const-pattern-not-const-evaluable.rs

@@ -10,7 +10,7 @@
 
 // compile-pass
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 #[derive(PartialEq, Eq)]
 enum Cake {

src/test/ui/consts/const-size_of-cycle.rs

@@ -10,8 +10,6 @@
 
 // error-pattern: cycle detected
 
-#![feature(const_fn)]
-
 struct Foo {
     bytes: [u8; std::mem::size_of::<Foo>()]
 }

src/test/ui/infinite/infinite-recursion-const-fn.rs

@@ -10,7 +10,7 @@
 
 //https://github.com/rust-lang/rust/issues/31364
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 const fn a() -> usize { b() }
 const fn b() -> usize { a() }
 const ARR: [i32; a()] = [5; 6]; //~ ERROR could not evaluate constant expression

src/test/ui/issues/issue-44415.rs

@@ -10,7 +10,7 @@
 
 //~^^^^^^^^^^ ERROR cycle detected when computing layout of
 
-#![feature(const_fn)]
+
 #![feature(core_intrinsics)]
 
 use std::intrinsics;

src/test/ui/unsafe/unsafe-const-fn.rs

@@ -10,7 +10,7 @@
 
 // A quick test of 'unsafe const fn' functionality
 
-#![feature(const_fn)]
+#![feature(min_const_fn)]
 
 const unsafe fn dummy(v: u32) -> u32 {
     !v