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`looking-back' strange warning

From: Andreas Röhler
Subject: `looking-back' strange warning
Date: Wed, 30 Sep 2015 10:25:35 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 
M-x `byte-compile-file' warns:

... Warning: looking-back called with 1 argument, but
    requires 2-3


While its definition:

(defun looking-back (regexp &optional limit greedy)


Docu bug?

Cheers,

Andreas

GNU Emacs 25.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.23) of 2015-08-27
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