src/test/ui/impl-trait/issue-49685.rs

   1 // run-pass
   2 // Regression test for #49685: drop elaboration was not revealing the
   3 // value of `impl Trait` returns, leading to an ICE.
   4
   5 fn main() {
   6     let _ = Some(())
   7         .into_iter()
   8         .flat_map(|_| Some(()).into_iter().flat_map(func));
   9 }
  10
  11 fn func(_: ()) -> impl Iterator<Item = ()> {
  12     Some(()).into_iter().flat_map(|_| vec![])
  13 }