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`. |