Exceptions and rules
Posted Oct 29, 2012 16:41 UTC (Mon) by khim
In reply to: Exceptions and rules
Parent article: Thoughts on the ext4 panic
"Exception that proves the rule" is part of the phrase. The full legal principle is exceptio probat regulam in casibus non exceptis ("the exception confirms the rule in cases not excepted") as you, I hope, know.
Classic example will be Special leave is given for men to be out of barracks tonight till 11.00 p.m.; "The exception proves the rule" means that this special leave implies a rule requiring men, except when an exception is made, to be in earlier. The value of this in interpreting statutes is plain.
Modern example will be Now we know that exceptional case of ext4 with journal_checksum is not stable. Application of exceptio probat regulam in casibus non exceptis principle will mean that: ext4 is stable unless non-standard option journal_checksum is used - and this is indeed the case.
IOW: this article is rare case where phrase "exception that proves the rule" is used correctly.
P.S. When you start badmouthing people and explain that the net is full of explanation about the original meaning of this phrase, and why almost every modern use of it is wrong it's good idea to refresh your own knowledge and see if you understand what the phrase means and when it's appropriately used.
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