error[E0308]: mismatched types --> $DIR/liveness-missing-ret2.rs:1:11 | LL | fn f() -> isize { | - ^^^^^ expected `isize`, found `()` | | | implicitly returns `()` as its body has no tail or `return` expression error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.