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// Test that `#[const_continue]` correctly emits cleanup paths for drops.
//
// Here, we first drop `DropBomb`, causing an unwind. Then `ExitOnDrop` should
// be dropped, causing us to exit with `0` rather than with some non-zero value
// due to the panic, which is what causes the test to pass.
//@ run-pass
//@ needs-unwind
#![allow(incomplete_features)]
#![feature(loop_match)]
enum State {
A,
B,
}
struct ExitOnDrop;
impl Drop for ExitOnDrop {
fn drop(&mut self) {
std::process::exit(0);
}
}
struct DropBomb;
impl Drop for DropBomb {
fn drop(&mut self) {
panic!("this must unwind");
}
}
fn main() {
let mut state = State::A;
#[loop_match]
'a: loop {
state = 'blk: {
match state {
State::A => {
let _exit = ExitOnDrop;
let _bomb = DropBomb;
#[const_continue]
break 'blk State::B;
}
State::B => break 'a,
}
};
}
unreachable!();
}
|
