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Diffstat (limited to 'tests/ui/traits/question-mark-result-err-mismatch.stderr')
| -rw-r--r-- | tests/ui/traits/question-mark-result-err-mismatch.stderr | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/tests/ui/traits/question-mark-result-err-mismatch.stderr b/tests/ui/traits/question-mark-result-err-mismatch.stderr new file mode 100644 index 000000000..3059e0bec --- /dev/null +++ b/tests/ui/traits/question-mark-result-err-mismatch.stderr @@ -0,0 +1,62 @@ +error[E0277]: `?` couldn't convert the error to `String` + --> $DIR/question-mark-result-err-mismatch.rs:14:22 + | +LL | fn foo() -> Result<String, String> { + | ---------------------- expected `String` because of this +... +LL | .map_err(|e| { + | __________- +LL | | e; + | | - help: remove this semicolon +LL | | }) + | |__________- this can't be annotated with `?` because it has type `Result<_, ()>` +LL | .map(|()| "")?; + | ^ the trait `From<()>` is not implemented for `String` + | + = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait + = 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 + | +LL | fn bar() -> Result<(), String> { + | ------------------ expected `String` because of this +LL | let x = foo(); + | ----- this has type `Result<_, String>` +... +LL | .map_err(|_| ())?; + | ---------------^ the trait `From<()>` is not implemented for `String` + | | + | this can't be annotated with `?` because it has type `Result<_, ()>` + | + = 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>`: + <String as From<char>> + <String as From<Box<str>>> + <String as From<Cow<'a, str>>> + <String as From<&str>> + <String as From<&mut str>> + <String as From<&String>> + = 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 + | +LL | fn baz() -> Result<String, String> { + | ---------------------- expected `String` because of this +... +LL | .ok_or_else(|| { + | __________- +LL | | "Couldn't split the test string"; + | | - help: remove this semicolon +LL | | })?; + | | -^ the trait `From<()>` is not implemented for `String` + | |__________| + | this can't be annotated with `?` because it has type `Result<_, ()>` + | + = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait + = note: required for `Result<String, String>` to implement `FromResidual<Result<Infallible, ()>>` + +error: aborting due to 3 previous errors + +For more information about this error, try `rustc --explain E0277`. |