src/test/ui/traits/issue-71036.rs

   1 #![feature(unsize, dispatch_from_dyn)]
   2
   3 use std::marker::Unsize;
   4 use std::ops::DispatchFromDyn;
   5
   6 #[allow(unused)]
   7 struct Foo<'a, T: ?Sized> {
   8     _inner: &'a &'a T,
   9 }
  10
  11 impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Foo<'a, U>> for Foo<'a, T> {}
  12 //~^ ERROR the trait bound `&'a T: Unsize<&'a U>` is not satisfied
  13 //~| NOTE the trait `Unsize<&'a U>` is not implemented for `&'a T`
  14 //~| NOTE all implementations of `Unsize` are provided automatically by the compiler
  15 //~| NOTE required for
  16
  17 fn main() {}