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6efddac288
Expand the primary span of E0277 when the immediate unmet bound is not what the user wrote:
```
error[E0277]: the trait bound `i32: Bar` is not satisfied
--> f100.rs:6:6
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6 | <i32 as Foo>::foo();
| ^^^ the trait `Bar` is not implemented for `i32`, which is required by `i32: Foo`
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help: this trait has no implementations, consider adding one
--> f100.rs:2:1
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2 | trait Bar {}
| ^^^^^^^^^
note: required for `i32` to implement `Foo`
--> f100.rs:3:14
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3 | impl<T: Bar> Foo for T {}
| --- ^^^ ^
| |
| unsatisfied trait bound introduced here
```
Fix #40120.
27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
error[E0277]: `?` couldn't convert the error to `()`
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--> $DIR/issue-32709.rs:4:11
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LL | fn a() -> Result<i32, ()> {
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| --------------- expected `()` because of this
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LL | Err(5)?;
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| ------^ the trait `From<{integer}>` is not implemented for `()`, which is required by `Result<i32, ()>: FromResidual<Result<Infallible, {integer}>>`
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| this can't be annotated with `?` because it has type `Result<_, {integer}>`
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= note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
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= help: the following other types implement trait `From<T>`:
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<(T,) as From<[T; 1]>>
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<(T, T) as From<[T; 2]>>
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<(T, T, T) as From<[T; 3]>>
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<(T, T, T, T) as From<[T; 4]>>
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<(T, T, T, T, T) as From<[T; 5]>>
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<(T, T, T, T, T, T) as From<[T; 6]>>
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<(T, T, T, T, T, T, T) as From<[T; 7]>>
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<(T, T, T, T, T, T, T, T) as From<[T; 8]>>
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and 4 others
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= note: required for `Result<i32, ()>` to implement `FromResidual<Result<Infallible, {integer}>>`
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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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