| // Copyright 2018 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![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] |
| |
| fn main() {} |