| #![feature(unsize, dispatch_from_dyn)] |
| |
| use std::{ |
| ops::DispatchFromDyn, |
| marker::{Unsize, PhantomData}, |
| }; |
| |
| struct WrapperWithExtraField<T>(T, i32); |
| |
| impl<T, U> DispatchFromDyn<WrapperWithExtraField<U>> for WrapperWithExtraField<T> |
| where |
| T: DispatchFromDyn<U>, |
| {} //~^^^ ERROR [E0378] |
| |
| |
| struct MultiplePointers<T: ?Sized>{ |
| ptr1: *const T, |
| ptr2: *const T, |
| } |
| |
| impl<T: ?Sized, U: ?Sized> DispatchFromDyn<MultiplePointers<U>> for MultiplePointers<T> |
| where |
| T: Unsize<U>, |
| {} //~^^^ ERROR [E0378] |
| |
| |
| struct NothingToCoerce<T: ?Sized> { |
| data: PhantomData<T>, |
| } |
| |
| impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NothingToCoerce<T>> for NothingToCoerce<U> {} |
| //~^ ERROR [E0378] |
| |
| #[repr(C)] |
| struct HasReprC<T: ?Sized>(Box<T>); |
| |
| impl<T: ?Sized, U: ?Sized> DispatchFromDyn<HasReprC<U>> for HasReprC<T> |
| where |
| T: Unsize<U>, |
| {} //~^^^ ERROR [E0378] |
| |
| #[repr(align(64))] |
| struct OverAlignedZst; |
| struct OverAligned<T: ?Sized>(Box<T>, OverAlignedZst); |
| |
| impl<T: ?Sized, U: ?Sized> DispatchFromDyn<OverAligned<U>> for OverAligned<T> |
| where |
| T: Unsize<U>, |
| {} //~^^^ ERROR [E0378] |
| |
| fn main() {} |