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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`
```
42 lines
1.7 KiB
Plaintext
42 lines
1.7 KiB
Plaintext
error[E0204]: the trait `Copy` cannot be implemented for this type
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--> $DIR/deep-bad-copy-reason.rs:38:24
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LL | pub struct List<'tcx, T>(Interned<'tcx, ListS<T>>);
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| ------------------------ this field does not implement `Copy`
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...
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LL | impl<'tcx, T> Copy for List<'tcx, T> {}
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| ^^^^^^^^^^^^^
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note: the `Copy` impl for `Interned<'tcx, ListS<T>>` requires that `OpaqueListContents: Sized`
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--> $DIR/deep-bad-copy-reason.rs:26:26
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LL | pub struct List<'tcx, T>(Interned<'tcx, ListS<T>>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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error[E0277]: the size for values of type `OpaqueListContents` cannot be known at compilation time
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--> $DIR/deep-bad-copy-reason.rs:26:26
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LL | pub struct List<'tcx, T>(Interned<'tcx, ListS<T>>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `ListS<T>`, the trait `Sized` is not implemented for `OpaqueListContents`
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note: required because it appears within the type `ListS<T>`
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--> $DIR/deep-bad-copy-reason.rs:7:12
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LL | pub struct ListS<T> {
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| ^^^^^
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note: required by an implicit `Sized` bound in `Interned`
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--> $DIR/deep-bad-copy-reason.rs:14:25
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LL | pub struct Interned<'a, T>(&'a T);
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| ^ required by the implicit `Sized` requirement on this type parameter in `Interned`
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help: consider relaxing the implicit `Sized` restriction
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LL | pub struct Interned<'a, T: ?Sized>(&'a T);
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| ++++++++
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0204, E0277.
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For more information about an error, try `rustc --explain E0204`.
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