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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
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LL | static FOO: IsCopy<Option<NotCopy>> = IsCopy { t: None };
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `NotCopy`
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= note: required for `Option<NotCopy>` to implement `Copy`
note: required by a bound in `IsCopy`
--> $DIR/wf-static-type.rs:7:17
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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
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LL | static FOO: IsCopy<Option<NotCopy>> = IsCopy { t: None };
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `NotCopy`, which is required by `Option<NotCopy>: Copy`
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= note: required for `Option<NotCopy>` to implement `Copy`
note: required by a bound in `IsCopy`
--> $DIR/wf-static-type.rs:7:17
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LL | struct IsCopy<T:Copy> { t: T }
| ^^^^ required by this bound in `IsCopy`
```
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 `()`
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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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= 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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