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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: how-many/count-matches for non-interactive use
Date: Sat, 16 Oct 2004 09:52:17 -0400
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    > Since it is using Lisp code, you just do it with more Lisp code.  Add
    > a t to the list in a place that corresponds to where the new extra arg
    > gets its value.

    Like this?

It looks right to me, assuming that keep-lines-read-args
returns a list of one element (which it currently does).
You might instead do (list (car (keep-lines-read-args...)) nil nil t)
to make it clear you're taking just one arg value from that.