Public bug reported:

Installing w3m-el creates file /usr/share/emacs/site-lisp/w3m/attic
/regexp-opt.el .  This file contains a buggy implementation of the
regexp-opt function.  Invoking (regexp-opt nil) causes an infinite loop.
By contrast, in Emacs, (regexp-opt nil) returns nil.

It would be good to either remove w3m-el's version of regexp-opt.el, or
replace it by a newer version that handles the (regexp-opt nil) case in
the same way as Emacs does.

** Affects: w3m-el (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1169526

Title:
  w3m-el coontains a buggy implementation of regexp-opt

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