warning: `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
  --> $DIR/unused-async.rs:5:1
   |
LL |   #[must_use]
   |   ^^^^^^^^^^^
LL |
LL | / async fn test() -> i32 {
LL | |     1
LL | | }
   | |_- this attribute does nothing, the `Future`s returned by async functions are already `must_use`
   |
   = note: `#[warn(unused_attributes)]` on by default

warning: `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
  --> $DIR/unused-async.rs:15:5
   |
LL |       #[must_use]
   |       ^^^^^^^^^^^
LL |
LL | /     async fn test_method() -> i32 {
LL | |         1
LL | |     }
   | |_____- this attribute does nothing, the `Future`s returned by async functions are already `must_use`

warning: 2 warnings emitted