47 lines
909 B
Rust
47 lines
909 B
Rust
// run-pass
|
|
#![allow(dead_code)]
|
|
// Check that drop elaboration clears the "master" discriminant
|
|
// drop flag even if it protects no fields.
|
|
|
|
struct Good(usize);
|
|
impl Drop for Good {
|
|
#[inline(never)]
|
|
fn drop(&mut self) {
|
|
println!("dropping Good({})", self.0);
|
|
}
|
|
}
|
|
|
|
struct Void;
|
|
impl Drop for Void {
|
|
#[inline(never)]
|
|
fn drop(&mut self) {
|
|
panic!("Suddenly, a Void appears.");
|
|
}
|
|
}
|
|
|
|
enum E {
|
|
Never(Void),
|
|
Fine(Good)
|
|
}
|
|
|
|
fn main() {
|
|
let mut go = true;
|
|
|
|
loop {
|
|
let next;
|
|
match go {
|
|
true => next = E::Fine(Good(123)),
|
|
false => return,
|
|
}
|
|
|
|
match next {
|
|
E::Never(_) => return,
|
|
E::Fine(_good) => go = false,
|
|
}
|
|
|
|
// `next` is dropped and StorageDead'd here. We must reset the
|
|
// discriminant's drop flag to avoid random variants being
|
|
// dropped.
|
|
}
|
|
}
|