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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Defining  functions on the fly
Date: Wed, 17 Jun 2015 10:30:24 -0400
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> Because these functions depend on grammar of the goal-language.

Indeed, that's why forward-sexp is supplemented by
forward-sexp-function, making it possible for the major mode to provide
an implementation that does a more sophisticated sort of parsing than
that supported by plain old syntax-tables.


        Stefan