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Esteban Kuber 3aac307ca6 Mention implementers of unsatisfied trait 
When encountering an unsatisfied trait bound, if there are no other
suggestions, mention all the types that *do* implement that trait:

```
error[E0277]: the trait bound `f32: Foo` is not satisfied
  --> $DIR/impl_wf.rs:22:6
   |
LL | impl Baz<f32> for f32 { }
   |      ^^^^^^^^ the trait `Foo` is not implemented for `f32`
   |
   = help: the following other types implement trait `Foo`:
             Option<T>
             i32
             str
note: required by a bound in `Baz`
  --> $DIR/impl_wf.rs:18:31
   |
LL | trait Baz<U: ?Sized> where U: Foo { }
   |                               ^^^ required by this bound in `Baz`
```

Mention implementers of traits in `ImplObligation`s.

Do not mention other `impl`s for closures, ranges and `?`.
2022-04-04 21:01:42 +00:00
..
benches
src Mention implementers of unsatisfied trait 2022-04-04 21:01:42 +00:00
Cargo.toml Propagate parallel_compiler feature through rustc crates. Turned off feature gives change of builded crates: 238 -> 224. 2022-03-28 08:41:12 +03:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.