error[E0308]: mismatched types --> $DIR/liveness-issue-2163.rs:5:30 | LL | a.iter().all(|_| -> bool { | ______________________________^ LL | | LL | | }); | |_____^ expected `bool`, found `()` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.