error[E0308]: mismatched types --> $DIR/issue-50688.rs:2:9 | LL | [1; || {}]; | ^^^^^ expected `usize`, found closure | = note: expected type `usize` found closure `{closure@$DIR/issue-50688.rs:2:9: 2:11}` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.