warning: unmatched-directive.asm(5): [-Wunmatched-directive]
    `PUSHC` without corresponding `POPC`
warning: unmatched-directive.asm(5): [-Wunmatched-directive]
    `PUSHO` without corresponding `POPO`
warning: unmatched-directive.asm(5): [-Wunmatched-directive]
    `PUSHS` without corresponding `POPS`