src/test/ui/if/if-let-arm-types.rs

fn main() {
    if let Some(b) = None {
        //~^ NOTE if and else have incompatible types
        ()
        //~^ NOTE expected because of this
    } else {
        1
    };
    //~^^ ERROR: if and else have incompatible types
    //~| NOTE expected `()`, found integer
}