|  | error[E0277]: the trait bound `(): IteratorAlias` is not satisfied | 
|  | --> $DIR/issue-108072-unmet-trait-alias-bound.rs:10:7 | 
|  | | | 
|  | LL |     f(()) | 
|  | |     - ^^ the trait `Iterator` is not implemented for `()` | 
|  | |     | | 
|  | |     required by a bound introduced by this call | 
|  | | | 
|  | = note: required for `()` to implement `IteratorAlias` | 
|  | note: required by a bound in `f` | 
|  | --> $DIR/issue-108072-unmet-trait-alias-bound.rs:7:14 | 
|  | | | 
|  | LL | fn f(_: impl IteratorAlias) {} | 
|  | |              ^^^^^^^^^^^^^ required by this bound in `f` | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0277`. |