fn testOverflow() !void
fn testOverflow() !void { try testing.expect((mul(i32, 3, 4) catch unreachable) == 12); try testing.expect((add(i32, 3, 4) catch unreachable) == 7); try testing.expect((sub(i32, 3, 4) catch unreachable) == -1); try testing.expect((shlExact(i32, 0b11, 4) catch unreachable) == 0b110000); }