>> Isn't trying to figure out why an arbitrary piece of code doesn't work
>> formally equivilent to the Halting Problem? (With non-termination simply
>> being the most basic kind of program bug...)
> 
> You're not asking grep to tell you why it failed, just to tell you where 
> in the code the error is so one can manually inspect the file and see if 
> one can determine why the failure occurred.

Oh, sure. I just meant that even once grep has found the location for 
you, the task you're attempting to perform is almost impossible anyway...

-- 
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