func main() {
    var abc = 0;
    // an asm block may use variables outside of the asm scope
    asm {
        li r1, abc
    }
    // This is not really a requirement
    opcode {
        01
    }

    // Exit
    var exit_status = 0;
    asm {
        li r255, exit_status
        tx
    }
}