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Esteban Küber 1d860902f6 When a trait isn't implemented, but another similar impl is found, point at it: 
```
error[E0277]: the trait bound `u32: Trait` is not satisfied
  --> $DIR/trait_objects_fail.rs:26:9
   |
LL |     foo(&10_u32);
   |         ^^^^^^^ the trait `Trait` is not implemented for `u32`
   |
help: the trait `Trait<12>` is not implemented for `u32`
      but trait `Trait<2>` is implemented for it
  --> $DIR/trait_objects_fail.rs:7:1
   |
LL | impl Trait<2> for u32 {}
   | ^^^^^^^^^^^^^^^^^^^^^
   = note: required for the cast from `&u32` to `&dyn Trait`
```

Pointing at the `impl` definition that *could* apply given a different self type is particularly useful when it has a blanket self type, as it might not be obvious and is not trivially greppable:

```
error[E0277]: the trait bound `RawImpl<_>: Raw<_>` is not satisfied
  --> $DIR/issue-62742.rs:4:5
   |
LL |     WrongImpl::foo(0i32);
   |     ^^^^^^^^^ unsatisfied trait bound
   |
help: the trait `Raw<_>` is not implemented for `RawImpl<_>`
      but trait `Raw<[_]>` is implemented for it
  --> $DIR/issue-62742.rs:29:1
   |
LL | impl<T> Raw<[T]> for RawImpl<T> {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: required by a bound in `SafeImpl`
  --> $DIR/issue-62742.rs:33:35
   |
LL | pub struct SafeImpl<T: ?Sized, A: Raw<T>>(PhantomData<(A, T)>);
   |                                   ^^^^^^ required by this bound in `SafeImpl`
```
2025-10-31 20:38:31 +00:00
..
fuzzer-ice-issue-112201.rs add TypingMode::Borrowck 2025-04-03 11:13:10 +02:00
fuzzer-ice-issue-112201.stderr add TypingMode::Borrowck 2025-04-03 11:13:10 +02:00
infinite-impl-trait-issue-38064.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
infinite-impl-trait-issue-38064.stderr Bless tests. 2023-01-27 20:10:17 +00:00
issue-21659-show-relevant-trait-impls-3.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-21659-show-relevant-trait-impls-3.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-35668.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-35668.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-36792.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-42479.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-46959.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-49376.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-49556.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-49579.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-49685.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-51185.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-52128.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-53457.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-54600.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-54600.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-54840.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-54840.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-54895.edition2015.stderr Add edition checks for some tests that had divergent output 2025-06-25 17:02:26 +00:00
issue-54895.edition2024.stderr Add edition checks for some tests that had divergent output 2025-06-25 17:02:26 +00:00
issue-54895.rs Add edition checks for some tests that had divergent output 2025-06-25 17:02:26 +00:00
issue-54966.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-54966.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-55608-captures-empty-region.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-55872-1.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-55872-1.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-55872-2.rs Remove the witness type from coroutine args 2025-07-31 17:38:28 +00:00
issue-55872-2.stderr Remove the witness type from coroutine args 2025-07-31 17:38:28 +00:00
issue-55872-3.rs Remove the witness type from coroutine args 2025-07-31 17:38:28 +00:00
issue-55872-3.stderr Remove the witness type from coroutine args 2025-07-31 17:38:28 +00:00
issue-55872.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-55872.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-56445.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-57464-unexpected-regions.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-57979-deeply-nested-impl-trait-in-assoc-proj.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-57979-impl-trait-in-path.rs Move an impl-Trait check from AST validation to AST lowering 2024-10-27 07:41:52 +01:00
issue-57979-impl-trait-in-path.stderr Move an impl-Trait check from AST validation to AST lowering 2024-10-27 07:41:52 +01:00
issue-57979-nested-impl-trait-in-assoc-proj.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
issue-57979-nested-impl-trait-in-assoc-proj.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-58504.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-58504.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-58956.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-58956.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-62742.rs Relate receiver invariantly in method probe for Mode::Path 2024-09-16 10:55:07 -04:00
issue-62742.stderr When a trait isn't implemented, but another similar impl is found, point at it: 2025-10-31 20:38:31 +00:00
issue-65581.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-67830.rs Stop proving outlives constraints on regions we already reported errors on 2024-05-29 09:27:07 +00:00
issue-67830.stderr Stop proving outlives constraints on regions we already reported errors on 2024-05-29 09:27:07 +00:00
issue-68532.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-70877.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-70877.stderr Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-70971.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-70971.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-72911.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-72911.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-74282.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-74282.stderr Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-77987.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-78722-2.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-78722-2.stderr Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-78722.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-78722.stderr Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-79099.edition2015.stderr Add edition checks for some tests that had divergent output 2025-06-25 17:02:26 +00:00
issue-79099.edition2024.stderr Add edition checks for some tests that had divergent output 2025-06-25 17:02:26 +00:00
issue-79099.rs Add edition checks for some tests that had divergent output 2025-06-25 17:02:26 +00:00
issue-82139.rs Split out a separate feature gate for impl trait in associated types 2023-04-12 16:17:31 +00:00
issue-82139.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-83919.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-83919.stderr Use root obligation on E0277 for some cases 2024-03-03 18:53:35 +00:00
issue-83929-impl-trait-in-generic-default.rs Split note, fix const/static impl trait error 2024-01-07 18:00:03 +00:00
issue-83929-impl-trait-in-generic-default.stderr Split note, fix const/static impl trait error 2024-01-07 18:00:03 +00:00
issue-84073.rs Use sup instead of eq when unifying self type 2024-04-21 20:10:12 -04:00
issue-84073.stderr Use sup instead of eq when unifying self type 2024-04-21 20:10:12 -04:00
issue-84919.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-84919.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-86201.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-86642.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-86642.stderr Split note, fix const/static impl trait error 2024-01-07 18:00:03 +00:00
issue-86719.rs Split out a separate feature gate for impl trait in associated types 2023-04-12 16:17:31 +00:00
issue-86719.stderr Split out a separate feature gate for impl trait in associated types 2023-04-12 16:17:31 +00:00
issue-86800.rs add TypingMode::Borrowck 2025-04-03 11:13:10 +02:00
issue-86800.stderr add TypingMode::Borrowck 2025-04-03 11:13:10 +02:00
issue-87295.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-87295.stderr (Re-)Implement impl_trait_in_bindings 2024-12-14 03:21:24 +00:00
issue-87340.rs Do not project when there are unconstrained impl params 2025-01-03 05:01:14 +00:00
issue-87340.stderr Do not project when there are unconstrained impl params 2025-01-03 05:01:14 +00:00
issue-87450.rs Just error on recursive opaque ty in HIR typeck 2025-05-20 10:08:56 +00:00
issue-87450.stderr Just error on recursive opaque ty in HIR typeck 2025-05-20 10:08:56 +00:00
issue-88236-2.rs Stop proving outlives constraints on regions we already reported errors on 2024-05-29 09:27:07 +00:00
issue-88236-2.stderr Stop proving outlives constraints on regions we already reported errors on 2024-05-29 09:27:07 +00:00
issue-88236.rs Improve error message for opaque captures 2024-03-08 19:08:13 +00:00
issue-88236.stderr Improve error message for opaque captures 2024-03-08 19:08:13 +00:00
issue-89312.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
issue-92305.rs Bless test fallout (duplicate diagnostics) 2024-03-20 13:00:34 -04:00
issue-92305.stderr Bless test fallout (duplicate diagnostics) 2024-03-20 13:00:34 -04:00
issue-93788.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-99073-2.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99073-2.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99073.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99073.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99348-impl-compatibility.rs UI tests: add missing diagnostic kinds where possible 2025-04-08 23:06:31 +03:00
issue-99348-impl-compatibility.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-99642-2.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99642.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99914.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-99914.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-100075-2.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-100075-2.stderr Just error on recursive opaque ty in HIR typeck 2025-05-20 10:08:56 +00:00
issue-100075.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-100075.stderr Just error on recursive opaque ty in HIR typeck 2025-05-20 10:08:56 +00:00
issue-100187.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-102605.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-102605.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-103181-1.current.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-103181-1.next.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-103181-1.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-103181-2.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-103181-2.stderr move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-103599.rs Just error on recursive opaque ty in HIR typeck 2025-05-20 10:08:56 +00:00
issue-103599.stderr Just error on recursive opaque ty in HIR typeck 2025-05-20 10:08:56 +00:00
issue-104815.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-105826.rs borrowck: more eagerly prepopulate opaques 2024-05-06 16:04:57 +00:00
issue-108591.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
issue-108592.rs move (and remove) impl Trait tests 2025-05-09 02:35:18 +00:00
type-error-post-normalization-test.rs borrowck: defer opaque type errors 2025-08-08 19:24:53 +02:00
type-error-post-normalization-test.stderr borrowck: defer opaque type errors 2025-08-08 19:24:53 +02:00