[code]
foreign fn putchar(c: i32) -> i32;

fn main() -> i32 {
    putchar(72);  // 'H'
    putchar(105); // 'i'
    putchar(33);  // '!'
    putchar(10);  // '\n'

    return 0;
}

[expected_return_code]
0

[expected_output]
Hi!