rust/tests/ui/issues/issue-41498.rs

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//@ 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();
}