Tweak wording

src/librustc_typeck/check/method/suggest.rs

@@ -988,6 +988,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let action = if let Some(param) = param_type {
                     format!("restrict type parameter `{}` with", param)
                 } else {
+                    // FIXME: it might only need to be imported into scope, not implemented.
                     "implement".to_string()
                 };
                 let mut use_note = true;
@@ -996,9 +997,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         err.span_label(
                             self.tcx.sess.source_map().def_span(span),
                             &format!(
-                                "`{}` defines an item `{}`",
+                                "`{}` defines an item `{}`, perhaps you need to {} it",
                                 self.tcx.def_path_str(trait_info.def_id),
-                                item_name
+                                item_name,
+                                action
                             ),
                         );
                         use_note = false

src/test/ui/associated-const/associated-const-no-item.stderr

@@ -2,7 +2,7 @@ error[E0599]: no associated item named `ID` found for type `i32` in the current
   --> $DIR/associated-const-no-item.rs:5:23
    |
 LL | trait Foo {
-   | --------- `Foo` defines an item `ID`
+   | --------- `Foo` defines an item `ID`, perhaps you need to implement it
 ...
 LL | const X: i32 = <i32>::ID;
    |                       ^^ associated item not found in `i32`

src/test/ui/auto-ref-slice-plus-ref.stderr

@@ -5,7 +5,7 @@ LL |     a.test_mut();
    |       ^^^^^^^^ help: there is a method with a similar name: `get_mut`
 ...
 LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test_mut`
+   | ------------ `MyIter` defines an item `test_mut`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 
@@ -16,7 +16,7 @@ LL |     a.test();
    |       ^^^^ method not found in `std::vec::Vec<{integer}>`
 ...
 LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test`
+   | ------------ `MyIter` defines an item `test`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 
@@ -27,7 +27,7 @@ LL |     ([1]).test();
    |           ^^^^ method not found in `[{integer}; 1]`
 ...
 LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test`
+   | ------------ `MyIter` defines an item `test`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 
@@ -38,7 +38,7 @@ LL |     (&[1]).test();
    |            ^^^^ method not found in `&[{integer}; 1]`
 ...
 LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test`
+   | ------------ `MyIter` defines an item `test`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 

src/test/ui/impl-trait/issues/issue-21659-show-relevant-trait-impls-3.stderr

@@ -2,7 +2,7 @@ error[E0599]: no method named `foo` found for struct `Bar` in the current scope
   --> $DIR/issue-21659-show-relevant-trait-impls-3.rs:20:8
    |
 LL | trait Foo<A> {
-   | ------------ `Foo` defines an item `foo`
+   | ------------ `Foo` defines an item `foo`, perhaps you need to implement it
 ...
 LL | struct Bar;
    | ----------- method `foo` not found for this

src/test/ui/impl-trait/no-method-suggested-traits.stderr

@@ -123,7 +123,7 @@ error[E0599]: no method named `method2` found for type `u64` in the current scop
   --> $DIR/no-method-suggested-traits.rs:45:10
    |
 LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`
+   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
 ...
 LL |     1u64.method2();
    |          ^^^^^^^ method not found in `u64`
@@ -134,7 +134,7 @@ error[E0599]: no method named `method2` found for struct `std::rc::Rc<&mut std::
   --> $DIR/no-method-suggested-traits.rs:47:44
    |
 LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`
+   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
 ...
 LL |     std::rc::Rc::new(&mut Box::new(&1u64)).method2();
    |                                            ^^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&u64>>`
@@ -145,7 +145,7 @@ error[E0599]: no method named `method2` found for struct `no_method_suggested_tr
   --> $DIR/no-method-suggested-traits.rs:50:37
    |
 LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`
+   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
 ...
 LL |     no_method_suggested_traits::Foo.method2();
    |                                     ^^^^^^^ method not found in `no_method_suggested_traits::Foo`
@@ -156,7 +156,7 @@ error[E0599]: no method named `method2` found for struct `std::rc::Rc<&mut std::
   --> $DIR/no-method-suggested-traits.rs:52:71
    |
 LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`
+   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
 ...
 LL |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method2();
    |                                                                       ^^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Foo>>`
@@ -167,7 +167,7 @@ error[E0599]: no method named `method2` found for enum `no_method_suggested_trai
   --> $DIR/no-method-suggested-traits.rs:54:40
    |
 LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`
+   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
 ...
 LL |     no_method_suggested_traits::Bar::X.method2();
    |                                        ^^^^^^^ method not found in `no_method_suggested_traits::Bar`
@@ -178,7 +178,7 @@ error[E0599]: no method named `method2` found for struct `std::rc::Rc<&mut std::
   --> $DIR/no-method-suggested-traits.rs:56:74
    |
 LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`
+   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
 ...
 LL |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method2();
    |                                                                          ^^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Bar>>`

src/test/ui/issues/issue-5153.stderr

@@ -2,7 +2,7 @@ error[E0599]: no method named `foo` found for reference `&dyn Foo` in the curren
   --> $DIR/issue-5153.rs:10:27
    |
 LL | trait Foo {
-   | --------- `Foo` defines an item `foo`
+   | --------- `Foo` defines an item `foo`, perhaps you need to implement it
 ...
 LL |     (&5isize as &dyn Foo).foo();
    |                           ^^^ method not found in `&dyn Foo`

src/test/ui/issues/issue-57362-1.stderr

@@ -2,7 +2,7 @@ error[E0599]: no method named `f` found for fn pointer `fn(&u8)` in the current
   --> $DIR/issue-57362-1.rs:20:7
    |
 LL | trait Trait {
-   | ----------- `Trait` defines an item `f`
+   | ----------- `Trait` defines an item `f`, perhaps you need to implement it
 ...
 LL |     a.f();
    |       ^ method not found in `fn(&u8)`

src/test/ui/issues/issue-57362-2.stderr

@@ -2,7 +2,7 @@ error[E0599]: no function or associated item named `make_g` found for fn pointer
   --> $DIR/issue-57362-2.rs:22:25
    |
 LL | trait X {
-   | ------- `X` defines an item `make_g`
+   | ------- `X` defines an item `make_g`, perhaps you need to implement it
 ...
 LL |     let x = <fn (&())>::make_g();
    |                         ^^^^^^ function or associated item not found in `for<'r> fn(&'r ())`

src/test/ui/never_type/issue-2149.stderr

@@ -10,7 +10,7 @@ error[E0599]: no method named `bind` found for array `[&str; 1]` in the current
   --> $DIR/issue-2149.rs:13:12
    |
 LL | trait VecMonad<A> {
-   | ----------------- `VecMonad` defines an item `bind`
+   | ----------------- `VecMonad` defines an item `bind`, perhaps you need to implement it
 ...
 LL |     ["hi"].bind(|x| [x] );
    |            ^^^^ method not found in `[&str; 1]`

src/test/ui/object-pointer-types.stderr

@@ -2,7 +2,7 @@ error[E0599]: no method named `owned` found for reference `&dyn Foo` in the curr
   --> $DIR/object-pointer-types.rs:11:7
    |
 LL | trait Foo {
-   | --------- `Foo` defines an item `owned`
+   | --------- `Foo` defines an item `owned`, perhaps you need to implement it
 ...
 LL |     x.owned();
    |       ^^^^^ method not found in `&dyn Foo`
@@ -13,7 +13,7 @@ error[E0599]: no method named `owned` found for mutable reference `&mut dyn Foo`
   --> $DIR/object-pointer-types.rs:17:7
    |
 LL | trait Foo {
-   | --------- `Foo` defines an item `owned`
+   | --------- `Foo` defines an item `owned`, perhaps you need to implement it
 ...
 LL |     x.owned();
    |       ^^^^^ method not found in `&mut dyn Foo`

src/test/ui/self/point-at-arbitrary-self-type-trait-method.stderr

@@ -4,7 +4,7 @@ error[E0599]: no method named `foo` found for struct `A` in the current scope
 LL | trait B { fn foo(self: Box<Self>); }
    | -------      --- the method is available for `std::boxed::Box<A>` here
    | |
-   | `B` defines an item `foo`
+   | `B` defines an item `foo`, perhaps you need to implement it
 LL | struct A;
    | --------- method `foo` not found for this
 ...

src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr

@@ -2,7 +2,7 @@ error[E0599]: no method named `foo_one` found for struct `MyStruct` in the curre
   --> $DIR/specialization-trait-not-implemented.rs:22:29
    |
 LL | trait Foo {
-   | --------- `Foo` defines an item `foo_one`
+   | --------- `Foo` defines an item `foo_one`, perhaps you need to implement it
 ...
 LL | struct MyStruct;
    | ----------------

src/test/ui/traits/trait-item-privacy.stderr

@@ -5,7 +5,7 @@ LL | struct S;
    | --------- method `a` not found for this
 ...
 LL |     trait A {
-   |     ------- `method::A` defines an item `a`
+   |     ------- `method::A` defines an item `a`, perhaps you need to implement it
 ...
 LL |     S.a();
    |       ^ method not found in `S`
@@ -47,7 +47,7 @@ LL | struct S;
    | --------- function or associated item `a` not found for this
 ...
 LL |     trait A {
-   |     ------- `method::A` defines an item `a`
+   |     ------- `method::A` defines an item `a`, perhaps you need to implement it
 ...
 LL |     S::a(&S);
    |        ^ function or associated item not found in `S`
@@ -82,7 +82,7 @@ LL | struct S;
    | --------- associated item `A` not found for this
 ...
 LL |     trait A {
-   |     ------- `assoc_const::A` defines an item `A`
+   |     ------- `assoc_const::A` defines an item `A`, perhaps you need to implement it
 ...
 LL |     S::A;
    |        ^ associated item not found in `S`

src/test/ui/trivial-bounds/trivial-bounds-leak.stderr

@@ -12,7 +12,7 @@ error[E0599]: no method named `test` found for type `i32` in the current scope
   --> $DIR/trivial-bounds-leak.rs:24:10
    |
 LL | pub trait Foo {
-   | ------------- `Foo` defines an item `test`
+   | ------------- `Foo` defines an item `test`, perhaps you need to implement it
 ...
 LL |     3i32.test();
    |          ^^^^ method not found in `i32`