error: purge-ref.asm(4):
    Symbol "ref" is referenced and thus cannot be purged
warning: purge-ref.asm(7): [-Wpurge]
    Purging a label "OK"
error: purge-ref.asm(11):
    Symbol "NotOK" is referenced and thus cannot be purged
error: purge-ref.asm(15):
    Symbol "EvenLessOK" is referenced and thus cannot be purged
warning: purge-ref.asm(23): [-Wpurge]
    Purging a label "Maybe"
error: Assembly aborted (3 errors)!