mirror of https://github.com/rust-lang/rust
51 lines
2.2 KiB
Plaintext
51 lines
2.2 KiB
Plaintext
error[E0378]: the trait `DispatchFromDyn` may only be implemented for structs containing the field being coerced, ZST fields with 1 byte alignment, and nothing else
|
|
--> $DIR/invalid_dispatch_from_dyn_impls.rs:10:1
|
|
|
|
|
LL | / impl<T, U> DispatchFromDyn<WrapperWithExtraField<U>> for WrapperWithExtraField<T>
|
|
LL | | where
|
|
LL | | T: DispatchFromDyn<U>,
|
|
| |__________________________^
|
|
|
|
|
= note: extra field `1` of type `i32` is not allowed
|
|
|
|
error[E0378]: implementing the `DispatchFromDyn` trait requires multiple coercions
|
|
--> $DIR/invalid_dispatch_from_dyn_impls.rs:21:1
|
|
|
|
|
LL | / impl<T: ?Sized, U: ?Sized> DispatchFromDyn<MultiplePointers<U>> for MultiplePointers<T>
|
|
LL | | where
|
|
LL | | T: Unsize<U>,
|
|
| |_________________^
|
|
|
|
|
= note: the trait `DispatchFromDyn` may only be implemented for a coercion between structures with a single field being coerced
|
|
= note: currently, 2 fields need coercions: `ptr1` (`*const T` to `*const U`), `ptr2` (`*const T` to `*const U`)
|
|
|
|
error[E0378]: the trait `DispatchFromDyn` may only be implemented for a coercion between structures
|
|
--> $DIR/invalid_dispatch_from_dyn_impls.rs:31:1
|
|
|
|
|
LL | impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NothingToCoerce<T>> for NothingToCoerce<U> {}
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: expected a single field to be coerced, none found
|
|
|
|
error[E0378]: structs implementing `DispatchFromDyn` may not have `#[repr(packed)]` or `#[repr(C)]`
|
|
--> $DIR/invalid_dispatch_from_dyn_impls.rs:37:1
|
|
|
|
|
LL | / impl<T: ?Sized, U: ?Sized> DispatchFromDyn<HasReprC<U>> for HasReprC<T>
|
|
LL | | where
|
|
LL | | T: Unsize<U>,
|
|
| |_________________^
|
|
|
|
error[E0378]: the trait `DispatchFromDyn` may only be implemented for structs containing the field being coerced, ZST fields with 1 byte alignment, and nothing else
|
|
--> $DIR/invalid_dispatch_from_dyn_impls.rs:46:1
|
|
|
|
|
LL | / impl<T: ?Sized, U: ?Sized> DispatchFromDyn<OverAligned<U>> for OverAligned<T>
|
|
LL | | where
|
|
LL | | T: Unsize<U>,
|
|
| |_____________________^
|
|
|
|
|
= note: extra field `1` of type `OverAlignedZst` is not allowed
|
|
|
|
error: aborting due to 5 previous errors
|
|
|
|
For more information about this error, try `rustc --explain E0378`.
|