5b54286640
Remove the "which is required by `{root_obligation}`" post-script in
"the trait `X` is not implemented for `Y`" explanation in E0277. This
information is already conveyed in the notes explaining requirements,
making it redundant while making the text (particularly in labels)
harder to read.
```
error[E0277]: the trait bound `NotCopy: Copy` is not satisfied
--> $DIR/wf-static-type.rs:10:13
|
LL | static FOO: IsCopy<Option<NotCopy>> = IsCopy { t: None };
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `NotCopy`
|
= note: required for `Option<NotCopy>` to implement `Copy`
note: required by a bound in `IsCopy`
--> $DIR/wf-static-type.rs:7:17
|
LL | struct IsCopy<T:Copy> { t: T }
| ^^^^ required by this bound in `IsCopy`
```
vs the prior
```
error[E0277]: the trait bound `NotCopy: Copy` is not satisfied
--> $DIR/wf-static-type.rs:10:13
|
LL | static FOO: IsCopy<Option<NotCopy>> = IsCopy { t: None };
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `NotCopy`, which is required by `Option<NotCopy>: Copy`
|
= note: required for `Option<NotCopy>` to implement `Copy`
note: required by a bound in `IsCopy`
--> $DIR/wf-static-type.rs:7:17
|
LL | struct IsCopy<T:Copy> { t: T }
| ^^^^ required by this bound in `IsCopy`
```
63 lines
2.8 KiB
Plaintext
63 lines
2.8 KiB
Plaintext
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` implements `From<&String>`
|
|
`String` implements `From<&mut str>`
|
|
`String` implements `From<&str>`
|
|
`String` implements `From<Box<str>>`
|
|
`String` implements `From<Cow<'_, str>>`
|
|
`String` implements `From<char>`
|
|
= 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`.
|