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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: canonical name  ending "-p"
Date: Fri, 18 Mar 2011 21:52:37 -0400
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> It means predicate. Functions ending in -p return either t or nil, and
> variables ending in -p contain either t or nil.

Actually the use for variables is discouraged.  Among other things these
aren't "predicates" in the mathematical logic sense.


        Stefan "Who'd be happy to use ? instead, like in Scheme"