mirror of https://github.com/rust-lang/rust
52 lines
1.5 KiB
Rust
52 lines
1.5 KiB
Rust
//@ run-pass
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#![feature(unsize, dispatch_from_dyn, never_type)]
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#![allow(dead_code)]
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use std::{
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ops::DispatchFromDyn,
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marker::{Unsize, PhantomData},
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};
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struct Zst;
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struct NestedZst(PhantomData<()>, Zst);
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struct WithUnit<T: ?Sized>(Box<T>, ());
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithUnit<U>> for WithUnit<T>
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where T: Unsize<U> {}
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struct WithPhantom<T: ?Sized>(Box<T>, PhantomData<()>);
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithPhantom<U>> for WithPhantom<T>
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where T: Unsize<U> {}
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struct WithNever<T: ?Sized>(Box<T>, !);
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithNever<U>> for WithNever<T>
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where T: Unsize<U> {}
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struct WithZst<T: ?Sized>(Box<T>, Zst);
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithZst<U>> for WithZst<T>
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where T: Unsize<U> {}
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struct WithNestedZst<T: ?Sized>(Box<T>, NestedZst);
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithNestedZst<U>> for WithNestedZst<T>
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where T: Unsize<U> {}
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struct Generic<T: ?Sized, A>(Box<T>, A);
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, ()>> for Generic<T, ()>
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where T: Unsize<U> {}
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, PhantomData<()>>>
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for Generic<T, PhantomData<()>>
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where T: Unsize<U> {}
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, !>> for Generic<T, !>
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where T: Unsize<U> {}
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, Zst>> for Generic<T, Zst>
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where T: Unsize<U> {}
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impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, NestedZst>> for Generic<T, NestedZst>
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where T: Unsize<U> {}
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fn main() {}
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