fn test_multiple_assign() {
    a, b, c := 1, 2, 3
    assert a == 1
    assert b == 2
    assert c == 3
}

fn test_multiple_assign_swap_simple() {
    mut a := 11
    mut b := 22
    a, b = b, a
    assert a == 22
    assert b == 11
}

fn test_multiple_assign_swap_complex() {
    mut a := 11
    mut b := 22
    mut c := 33
    mut d := 44
    a, b, c, d = b, a, d, c
    assert a == 22
    assert b == 11
    assert c == 44
    assert d == 33
}

fn test_multiple_assign_infix_expr() {
    mut a := 11
    mut b := 22
    mut c := 33
    a, b, c = b + 1, a * 2, c - a
    assert a == 23
    assert b == 22
    assert c == 22
}

fn test_multiple_assign_prefix_expr() {
    mut a := 11
    mut b := 22
    mut c := 33
    a, b, c = -b, -c, -a
    assert a == -22
    assert b == -33
    assert c == -11
}

fn test_multiple_assign_postfix_expr() {
    mut a := 11
    mut b := 22
    mut c := 33
    a, b, c = b++, c++, a--
    assert a == 22
    assert b == 33
    assert c == 11
}

fn test_multiple_assign_complex_expr() {
    mut a := 11
    mut b := 22
    mut c := 33
    a, b, c = -b + 1, -c * 2, a++
    assert a == -21
    assert b == -66
    assert c == 11
}