error[E0308]: mismatched types --> $DIR/liveness-forgot-ret.rs:3:25 | LL | fn f(a: isize) -> isize { if god_exists(a) { return 5; }; } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected isize, found () | = note: expected type `isize` found type `()` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.