fn f(u usize) usize
fn g(i isize) isize

fn test_usize() {
    mut u := usize(3)
    u += u32(1)
    assert u == 4
    u = 4
    u++
    assert u == 5
    assert u.str() == '5'
    $if x64 {
        assert '${usize(0x140000000):X}' == '140000000'
    }
}

fn test_isize() {
    mut i := isize(-3)
    i -= int(1)
    assert i == -4
    i = -5
    i += 2
    assert i == -3
    assert i.str() == '-3'
    $if x64 {
        assert '${isize(0x140000000):X}' == '140000000'
    }
}