Published at LXer:
We've all been there: You're tracking down some evil bug, and you have the sudden chilling realization that you're going to have to re-factor an enormous chunk of code to fix it. You break out in a cold sweat as you run a quick grep over the source base: hundreds of lines of code to change! And the change is too complex to do with a script because it depends on the calling context, or requires adding a new variable to every caller.
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