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warning: unused coroutine that must be used
  --> $DIR/match-bindings.rs:12:5
   |
LL | /     || {
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