tests/ui/coroutine/issue-57084.rs

   1 // This issue reproduces an ICE on compile (E.g. fails on 2018-12-19 nightly).
   2 // "cannot relate bound region: ReLateBound(DebruijnIndex(1), BrAnon(1)) <= '?1"
   3 // run-pass
   4 // edition:2018
   5 #![feature(coroutines,coroutine_trait)]
   6 use std::ops::Coroutine;
   7
   8 fn with<F>(f: F) -> impl Coroutine<Yield=(), Return=()>
   9 where F: Fn() -> ()
  10 {
  11     move || {
  12         loop {
  13             match f() {
  14                 _ => yield,
  15             }
  16         }
  17     }
  18 }
  19
  20 fn main() {
  21     let data = &vec![1];
  22     || { //~ WARN unused coroutine that must be used
  23         let _to_pin = with(move || println!("{:p}", data));
  24         loop {
  25             yield
  26         }
  27     };
  28 }