//@ run-pass
#![allow(dead_code)]
#![feature(coroutines)]
enum Enum {
A(String),
B
}
fn main() {
#[coroutine] || { //~ WARN unused coroutine that must be used
loop {
if let true = true {
match Enum::A(String::new()) {
Enum::A(_var) => {}
Enum::B => {}
yield;
};