error[E0107]: this trait takes 3 generic arguments but 1 generic argument was supplied
  --> $DIR/unboxed-closure-sugar-wrong-number-number-type-parameters-3.rs:5:16
   |
LL | fn foo(_: &dyn Three())
   |                ^^^^^-- supplied 1 generic argument
   |                |
   |                expected 3 generic arguments
   |
note: trait defined here, with 3 generic parameters: `A`, `B`, `C`
  --> $DIR/unboxed-closure-sugar-wrong-number-number-type-parameters-3.rs:3:7
   |
LL | trait Three<A,B,C> { fn dummy(&self) -> (A,B,C); }
   |       ^^^^^ - - -

error[E0220]: associated type `Output` not found for `Three<(), [type error], [type error]>`
  --> $DIR/unboxed-closure-sugar-wrong-number-number-type-parameters-3.rs:5:16
   |
LL | fn foo(_: &dyn Three())
   |                ^^^^^^^ associated type `Output` not found

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0107, E0220.
For more information about an error, try `rustc --explain E0107`.