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Unless `try_trait_v2` is enabled, don't mention that `FromResidual` isn't implemented for a specific type when the implicit `From` conversion of a `?` fails. For the end user on stable, `?` might as well be a compiler intrinsic, so we remove that note to avoid further confusion and allowing other parts of the error to be more prominent.
```
error[E0277]: `?` couldn't convert the error to `u8`
--> $DIR/bad-interconversion.rs:4:20
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LL | fn result_to_result() -> Result<u64, u8> {
| --------------- expected `u8` because of this
LL | Ok(Err(123_i32)?)
| ------------^ the trait `From<i32>` is not implemented for `u8`
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| this can't be annotated with `?` because it has type `Result<_, i32>`
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= note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
= help: the following other types implement trait `From<T>`:
`u8` implements `From<Char>`
`u8` implements `From<bool>`
```
26 lines
1.1 KiB
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26 lines
1.1 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 `()`
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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, T)` implements `From<[T; 2]>`
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`(T, T, T)` implements `From<[T; 3]>`
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`(T, T, T, T)` implements `From<[T; 4]>`
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`(T, T, T, T, T)` implements `From<[T; 5]>`
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`(T, T, T, T, T, T)` implements `From<[T; 6]>`
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`(T, T, T, T, T, T, T)` implements `From<[T; 7]>`
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`(T, T, T, T, T, T, T, T)` implements `From<[T; 8]>`
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`(T, T, T, T, T, T, T, T, T)` implements `From<[T; 9]>`
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and 4 others
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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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