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18 lines
513 B
Rust
18 lines
513 B
Rust
#![feature(unsize, dispatch_from_dyn)]
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use std::marker::Unsize;
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use std::ops::DispatchFromDyn;
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#[allow(unused)]
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struct Foo<'a, T: ?Sized> {
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_inner: &'a &'a T,
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}
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impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Foo<'a, U>> for Foo<'a, T> {}
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//~^ ERROR the trait bound `&'a T: Unsize<&'a U>` is not satisfied
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//~| NOTE the trait `Unsize<&'a U>` is not implemented for `&'a T`
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//~| NOTE all implementations of `Unsize` are provided automatically by the compiler
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//~| NOTE required for
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fn main() {}
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