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Re:This should never happen by eternalban on Thursday March 31, 2016 @02:05PM (#11399206)
> It's a sub-pattern of "ain't got time for dat".

Disagree on this. It has nothing to do with efficiency in context of unlikely events. As others have noted here, it is effectively an assertion of expected language/system/operating-environment properties. Think axioms.

Re:This should never happen by ctdonath on Thursday March 31, 2016 @11:07PM (#11402279)
No, I'm primarily thinking of "ain't got time for dat", as in "there's a very real deadline, I have a lot of other things to get done, and this case isn't ever going to happen and I don't have time to prove it to the compiler."