rust/tests/ui/issues/issue-27401-dropflag-reinit.rs

27 lines
603 B
Rust

//@ run-pass
// Check that when a `let`-binding occurs in a loop, its associated
// drop-flag is reinitialized (to indicate "needs-drop" at the end of
// the owning variable's scope).
struct A<'a>(&'a mut i32);
impl<'a> Drop for A<'a> {
fn drop(&mut self) {
*self.0 += 1;
}
}
fn main() {
let mut cnt = 0;
for i in 0..2 {
let a = A(&mut cnt);
if i == 1 { // Note that
break; // both this break
} // and also
drop(a); // this move of `a`
// are necessary to expose the bug
}
assert_eq!(cnt, 2);
}