error[E0107]: trait takes 1 lifetime argument but 0 lifetime arguments were supplied --> $DIR/unboxed-closure-sugar-region.rs:30:51 | LL | fn test2(x: &dyn Foo<(isize,),Output=()>, y: &dyn Foo(isize)) { | ^^^ expected 1 lifetime argument | note: trait defined here, with 1 lifetime parameter: `'a` --> $DIR/unboxed-closure-sugar-region.rs:10:7 | LL | trait Foo<'a,T> { | ^^^ -- error: aborting due to previous error For more information about this error, try `rustc --explain E0107`.