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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: Regexp error scan (March 26)
Date: Wed, 27 Mar 2019 10:36:47 -0400
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>> (regexp-opt-charset (append erc-lurker-ignore-chars nil))

Why do we need the append-nil thingy?
Does regexp-opt-charset modify its argument by side-effect?
If so, we should change that,


        Stefan