error[E0220]: associated type `Output` not found for `One<()>`
  --> $DIR/unboxed-closure-sugar-wrong-number-number-type-parameters-1.rs:5:16
   |
LL | fn foo(_: &dyn One())
   |                ^^^^^ associated type `Output` not found

error: aborting due to previous error

For more information about this error, try `rustc --explain E0220`.