error[E0069]: `return;` in a function whose return type is not `()` --> $DIR/ret-non-nil.rs:5:19 | LL | fn g() -> isize { return; } | ----- ^^^^^^ return type is not `()` | | | expected `isize` because of this return type error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0069`.