3aac307ca6
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
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LL | impl Baz<f32> for f32 { }
| ^^^^^^^^ the trait `Foo` is not implemented for `f32`
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= 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
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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 `?`.
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37 lines
1.0 KiB
Plaintext
error[E0277]: the trait bound `i32: Tr` is not satisfied
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--> $DIR/issue-84973-negative.rs:10:9
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LL | bar(a);
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| --- ^ the trait `Tr` is not implemented for `i32`
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| required by a bound introduced by this call
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= help: the trait `Tr` is implemented for `&f32`
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note: required by a bound in `bar`
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--> $DIR/issue-84973-negative.rs:5:11
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LL | fn bar<T: Tr>(t: T) {}
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| ^^ required by this bound in `bar`
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error[E0277]: the trait bound `f32: Tr` is not satisfied
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--> $DIR/issue-84973-negative.rs:11:9
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LL | bar(b);
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| --- ^ expected an implementor of trait `Tr`
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| required by a bound introduced by this call
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note: required by a bound in `bar`
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--> $DIR/issue-84973-negative.rs:5:11
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LL | fn bar<T: Tr>(t: T) {}
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| ^^ required by this bound in `bar`
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help: consider borrowing here
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LL | bar(&b);
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| +
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0277`.
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