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| author | Esteban Küber <esteban@kuber.com.ar> | 2025-02-18 17:34:16 +0000 |
|---|---|---|
| committer | Esteban Küber <esteban@kuber.com.ar> | 2025-02-18 17:34:16 +0000 |
| commit | 6eb48824dac44b466ca03fe67760a63d8a45d1dc (patch) | |
| tree | d1a79d4fd7756f4a8e74564546143711bf4d7c74 /tests/ui/traits/question-mark-result-err-mismatch.stderr | |
| parent | d88ffcdb8bfc6f8b917574c1693eb9764a20eff5 (diff) | |
| download | rust-6eb48824dac44b466ca03fe67760a63d8a45d1dc.tar.gz rust-6eb48824dac44b466ca03fe67760a63d8a45d1dc.zip | |
Don't mention `FromResidual` on bad `?`
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
|
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`
| |
| this can't be annotated with `?` because it has type `Result<_, i32>`
|
= 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>`
```
Diffstat (limited to 'tests/ui/traits/question-mark-result-err-mismatch.stderr')
| -rw-r--r-- | tests/ui/traits/question-mark-result-err-mismatch.stderr | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/tests/ui/traits/question-mark-result-err-mismatch.stderr b/tests/ui/traits/question-mark-result-err-mismatch.stderr index bad325a6720..0f83c9e73a3 100644 --- a/tests/ui/traits/question-mark-result-err-mismatch.stderr +++ b/tests/ui/traits/question-mark-result-err-mismatch.stderr @@ -1,5 +1,5 @@ error[E0277]: `?` couldn't convert the error to `String` - --> $DIR/question-mark-result-err-mismatch.rs:14:22 + --> $DIR/question-mark-result-err-mismatch.rs:15:22 | LL | fn foo() -> Result<String, String> { | ---------------------- expected `String` because of this @@ -17,7 +17,7 @@ LL | .map(|()| "")?; = note: required for `Result<String, String>` to implement `FromResidual<Result<Infallible, ()>>` error[E0277]: `?` couldn't convert the error to `String` - --> $DIR/question-mark-result-err-mismatch.rs:28:25 + --> $DIR/question-mark-result-err-mismatch.rs:29:25 | LL | fn bar() -> Result<(), String> { | ------------------ expected `String` because of this @@ -40,7 +40,7 @@ LL | .map_err(|_| ())?; = note: required for `Result<(), String>` to implement `FromResidual<Result<Infallible, ()>>` error[E0277]: `?` couldn't convert the error to `String` - --> $DIR/question-mark-result-err-mismatch.rs:48:11 + --> $DIR/question-mark-result-err-mismatch.rs:49:11 | LL | fn baz() -> Result<String, String> { | ---------------------- expected `String` because of this |