| //@ run-pass | |
| // regression test for issue #41498. | |
| struct S; | |
| impl S { | |
| fn mutate(&mut self) {} | |
| } | |
| fn call_and_ref<T, F: FnOnce() -> T>(x: &mut Option<T>, f: F) -> &mut T { | |
| *x = Some(f()); | |
| x.as_mut().unwrap() | |
| } | |
| fn main() { | |
| let mut n = None; | |
| call_and_ref(&mut n, || [S])[0].mutate(); | |
| } |