error[E0107]: this associated type takes 1 lifetime argument but 0 lifetime arguments were supplied --> $DIR/issue-102768.rs:9:30 | LL | fn f2<'a>(arg: Box = &'a ()>>) {} | ^ expected 1 lifetime argument | note: associated type defined here, with 1 lifetime parameter: `'a` --> $DIR/issue-102768.rs:5:10 | LL | type Y<'a>; | ^ -- help: add missing lifetime argument | LL | fn f2<'a>(arg: Box = &'a ()>>) {} | +++ error[E0107]: this associated type takes 0 generic arguments but 1 generic argument was supplied --> $DIR/issue-102768.rs:9:30 | LL | fn f2<'a>(arg: Box = &'a ()>>) {} | ^--- help: remove these generics | | | expected 0 generic arguments | note: associated type defined here, with 0 generic parameters --> $DIR/issue-102768.rs:5:10 | LL | type Y<'a>; | ^ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0107`.