src/test/ui/type-alias-impl-trait/multiple-def-uses-in-one-fn.rs

   1 // https://github.com/rust-lang/rust/issues/73481
   2 // This test used to cause unsoundness, since one of the two possible
   3 // resolutions was chosen at random instead of erroring due to conflicts.
   4
   5 #![feature(type_alias_impl_trait)]
   6
   7 type X<A, B> = impl Into<&'static A>;
   8
   9 fn f<A, B: 'static>(a: &'static A, b: B) -> (X<A, B>, X<B, A>) {
  10     (a, a)
  11     //~^ ERROR the trait bound `&'static B: From<&A>` is not satisfied
  12 }
  13
  14 fn main() {
  15     println!("{}", <X<_, _> as Into<&String>>::into(f(&[1isize, 2, 3], String::new()).1));
  16 }