auto i = 1;
auto j = 2;
auto k = 3;

assert_equal(3, i + j);
assert_equal(1, +i);
assert_equal(-1, i - j);
assert_equal(-1, -i);
assert_equal(2, j & k);
assert_equal(-3, ~j);
assert_equal(1, j ^ k);
assert_equal(3, i | j);
assert_equal(2, j / i);
assert_equal(4, i << j);
assert_equal(6, j * k);
assert_equal(1, k % j);
assert_equal(1, j >> i);

assert_equal(0, i &= 2);
assert_equal(1, j ^= 3);
assert_equal(3, j |= 2);
assert_equal(-1, i -= 1);
assert_equal(6, j <<= 1);
assert_equal(12, j *= 2);
assert_equal(6, j /= 2);
assert_equal(2, j %= 4);
assert_equal(1, j >>= 1);
assert_equal(2, j += 1);
assert_equal(1, --j);
assert_equal(2, ++j);


assert_throws("Error: \"Error with prefix operator evaluation: cannot modify constant value.\"", fun() { ++4; });
assert_throws("Error: \"Error with prefix operator evaluation: cannot modify constant value.\"", fun() { --4; });

assert_throws("Error: \"Error, cannot assign to constant value.\"", fun() { 5 = 5; });
assert_throws("Error: \"Error, cannot assign to constant value.\"", fun() { int(5) = 5; });