error[E0308]: mismatched types --> $DIR/liveness-issue-2163.rs:15:30 | LL | a.iter().all(|_| -> bool { | ______________________________^ LL | | //~^ ERROR mismatched types LL | | }); | |_____^ expected bool, found () | = note: expected type `bool` found type `()` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.