error[E0308]: mismatched types
  --> $DIR/issue-50585.rs:2:18
   |
LL |     |y: Vec<[(); for x in 0..2 {}]>| {};
   |                  ^^^^^^^^^^^^^^^^ expected usize, found ()
   |
   = note: expected type `usize`
              found type `()`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.