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1d860902f6
```
error[E0277]: the trait bound `u32: Trait` is not satisfied
--> $DIR/trait_objects_fail.rs:26:9
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LL | foo(&10_u32);
| ^^^^^^^ the trait `Trait` is not implemented for `u32`
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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
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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
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LL | WrongImpl::foo(0i32);
| ^^^^^^^^^ unsatisfied trait bound
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help: the trait `Raw<_>` is not implemented for `RawImpl<_>`
but trait `Raw<[_]>` is implemented for it
--> $DIR/issue-62742.rs:29:1
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LL | impl<T> Raw<[T]> for RawImpl<T> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: required by a bound in `SafeImpl`
--> $DIR/issue-62742.rs:33:35
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LL | pub struct SafeImpl<T: ?Sized, A: Raw<T>>(PhantomData<(A, T)>);
| ^^^^^^ required by this bound in `SafeImpl`
```
30 lines
1.1 KiB
Plaintext
30 lines
1.1 KiB
Plaintext
error[E0277]: the trait bound `String: Trait<u32>` is not satisfied
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--> $DIR/avoid-inference-constraints-from-blanket-3.rs:22:5
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LL | impls_trait(x);
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| ^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String`
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help: the trait `Trait<u32>` is not implemented for `String`
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but trait `Trait<u64>` is implemented for it
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--> $DIR/avoid-inference-constraints-from-blanket-3.rs:17:1
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LL | impl Trait<u64> for String {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: for that trait implementation, expected `u64`, found `u32`
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note: required for `String` to implement `Trait<u32>`
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--> $DIR/avoid-inference-constraints-from-blanket-3.rs:16:15
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LL | impl<T: Copy> Trait<u32> for T {}
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| ---- ^^^^^^^^^^ ^
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| |
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| unsatisfied trait bound introduced here
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note: required by a bound in `impls_trait`
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--> $DIR/avoid-inference-constraints-from-blanket-3.rs:18:19
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LL | fn impls_trait<T: Trait<U>, U>(_: T) {}
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| ^^^^^^^^ required by this bound in `impls_trait`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0277`.
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