tests/ui/nll/issue-63154-normalize.rs

   1 // Regression test for rust-lang/rust#63154
   2 //
   3 // Before, we would ICE after failing to normalize the destination type
   4 // when checking call destinations and also when checking MIR
   5 // assignment statements.
   6
   7 // check-pass
   8
   9 trait HasAssocType {
  10     type Inner;
  11 }
  12
  13 impl HasAssocType for () {
  14     type Inner = ();
  15 }
  16
  17 trait Tr<I, T>: Fn(I) -> Option<T> {}
  18 impl<I, T, Q: Fn(I) -> Option<T>> Tr<I, T> for Q {}
  19
  20 fn f<T: HasAssocType>() -> impl Tr<T, T::Inner> {
  21     |_| None
  22 }
  23
  24 fn g<T, Y>(f: impl Tr<T, Y>) -> impl Tr<T, Y> {
  25     f
  26 }
  27
  28 fn h() {
  29     g(f())(());
  30 }
  31
  32 fn main() {
  33     h();
  34 }