warning: unused coroutine that must be used
  --> $DIR/match-bindings.rs:12:18
   |
LL |       #[coroutine] || {
   |  __________________^
LL | |         loop {
LL | |             if let true = true {
LL | |                 match Enum::A(String::new()) {
...  |
LL | |         }
LL | |     };
   | |_____^
   |
   = note: coroutines are lazy and do nothing unless resumed
   = note: `#[warn(unused_must_use)]` on by default

warning: 1 warning emitted