ref: 187f88aa50f253eb670cdc415e9bc315ca289bb6
dir: /test/asm/purge-ref.err/
ERROR: purge-ref.asm(4): Symbol "ref" is referenced and thus cannot be purged 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 error: Assembly aborted (3 errors)!