error[E0277]: the trait bound `for<'a> (): Trait2<'a>` is not satisfied
  --> $DIR/issue-35570.rs:8:40
   |
LL | fn _ice(param: Box<dyn for <'a> Trait1<<() as Trait2<'a>>::Ty>>) {
   |                                        ^^^^^^^^^^^^^^^^^^^^^^ the trait `for<'a> Trait2<'a>` is not implemented for `()`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.