// MIR for `foo` after built

fn foo(_1: Foo) -> usize {
    debug foo => _1;
    let mut _0: usize;
    let _2: Foo;
    let mut _3: isize;

    bb0: {
        StorageLive(_2);
        _2 = move _1;
        _3 = discriminant(_2);
        _0 = move _3 as usize (IntToInt);
        StorageDead(_2);
        return;
    }
}