error[E0744]: `for` is not allowed in a `const` --> $DIR/issue-50585.rs:2:18 | LL | |y: Vec<[(); for x in 0..2 {}]>| {}; | ^^^^^^^^^^^^^^^^ error[E0308]: mismatched types --> $DIR/issue-50585.rs:2:18 | LL | |y: Vec<[(); for x in 0..2 {}]>| {}; | ^^^^^^^^^^^^^^^^ expected `usize`, found `()` error: aborting due to 2 previous errors Some errors have detailed explanations: E0308, E0744. For more information about an error, try `rustc --explain E0308`.