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sexp type checking

From: Roland Winkler
Subject: sexp type checking
Date: Wed, 28 Sep 2011 01:08:47 -0500

For BBDB I'd like to have a function for checking recursively the
type of a sexp, similar to what customize is doing via its :type
argument. The function should throw a mismatch error if the type
checking fails.

I do not want to reinvent the wheel. Does such a function already
exist? (Where??) If not, would it possibly be useful elsewhere, too?

I also looked into the customize code whether it contained something
that I could use for my purposes. Yet I do not know much about this
code. If it could be used to define such a function, I'd much
appreciate some hints how this can be done.



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