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Alex Shinn scripsit: > You didn't give any justification for this conclusion. > What's wrong with providing features? For one thing, there is no way to do it. If I write a portable implementation that supports backreferences, how do I cause the existence, or even the importation, of that package to assert the regexp-backrefs feature? After all, I might have several different implementations lying about. -- Principles. You can't say A is John Cowan <cowan@xxxxxxxx> made of B or vice versa. All mass http://www.ccil.org/~cowan is interaction. --Richard Feynman