ref: 61a9bfd33cf9e620a39c337291adc69b9558ff57
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)!