error[E0053]: method `owo` has an incompatible type for trait
  --> $DIR/method-signature-matches.rs:22:21
   |
LL |     async fn owo(_: u8) {}
   |                     ^^ expected `()`, found `u8`
   |
note: type in trait
  --> $DIR/method-signature-matches.rs:17:21
   |
LL |     async fn owo(x: ()) {}
   |                     ^^
   = note: expected signature `fn(()) -> _`
              found signature `fn(u8) -> _`
help: change the parameter type to match the trait
   |
LL |     async fn owo(_: ()) {}
   |                     ~~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0053`.