| error[E0593]: function is expected to take a single 0-tuple as argument, but it takes 2 distinct arguments | |
| --> $DIR/issue-47706-trait.rs:3:24 | |
| | | |
| LL | fn f(&self, _: ()) { | |
| | ------------------ takes 2 distinct arguments | |
| LL | None::<()>.map(Self::f); | |
| | ^^^^^^^ expected function that takes a single 0-tuple as argument | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0593`. |