error in process filter: unreachable code, this can't happen

["Robert D. Crawford" <rdc1x@xxxxxxxxxxx>]

I get the above error when trying to use xslt on some pages.  Here is
the output in my message buffer:

Downloading of `http://www.dailykos.com/storyonly/2008/2/28/155356/778/954/465859' complete.
Drawing... done
Quit [2 times]
Will apply linearize-tables before displaying HTML pages.
Turned on XSL
Contacting host: www.dailykos.com:80
Downloading of `http://www.dailykos.com/storyonly/2008/2/28/155356/778/954/465859' complete.
unreachable code, this can't happen
error in process filter: signal: unreachable code, this can't happen
error in process filter: unreachable code, this can't happen

another url that has problems is:

http://www.liveleak.com/view?i=983_1204238198

Other urls seem fine.

Here is a backtrace:

Debugger entered--Lisp error: (error "unreachable code, this can't happen")
  ad-Orig-signal(error ("unreachable code, this can't happen"))
  signal(error ("unreachable code, this can't happen"))
  ad-Orig-error("unreachable code, this can't happen")
  apply(ad-Orig-error "unreachable code, this can't happen")
  error("unreachable code, this can't happen")
  ad-Orig-w3-parse-buffer(#<buffer  *w3-html*<4>>)
  w3-parse-buffer(#<buffer  *w3-html*<4>>)
  w3-prepare-buffer()
  ad-Orig-w3-fetch-callback("http://www.dailykos.com/storyonly/2008/2/28/155356/778/954/465859";)
  w3-fetch-callback("http://www.dailykos.com/storyonly/2008/2/28/155356/778/954/465859";)
  w3-fetch-redirect-callback(nil "http://www.dailykos.com/storyonly/2008/2/28/155356/778/954/465859";)
  apply(w3-fetch-redirect-callback (nil "http://www.dailykos.com/storyonly/2008/2/28/155356/778/954/465859";))
  url-http-activate-callback()
  ad-Orig-url-http-content-length-after-change-function(43194 44022 828)
  url-http-content-length-after-change-function(43194 44022 828)
  url-http-generic-filter(#<process www.dailykos.com> "r_text = \"000000\";\ngoogle_color_url = \"CC6600\";\n//--></script><script type=\"text/javascript\"\n  src=\"http://pagead2.googlesyndication.com/pagead/show_ads.js\";></script></div><br /><h3>Candidates</h3>\n<p><a href=\"http://www.actblue.com/page/bluemajority?refcode=DKosSidebar\";>Blue Majority Candidates</a></div><div id=\"footer\"><p><a href=\"http://sm8.sitemeter.com/stats.asp?site=sm8dailykos\";><img src=\"http://sm8.sitemeter.com/meter.asp?site=sm8dailykos\"; alt=\"Site Meter\" border=\"0\" /></a>\n<a href=\"/\">Daily Kos homepage</a></p><p>\251 Kos Media, LLC<br />\nSite content may be used for any purpose without<br />explicit permission unless otherwise specified.<br /><a href=\"http://www.dailykos.com/special/privacy\";>Privacy Policy</a></p>\n<p>Powered by <a href=\"http://scoop.kuro5hin.org/\";>Scoop</a>.</p></div></div></body></html>")

The error message seems to come from w3-parse.el in the defun
w3-slow-parse-buffer.  This defun is _long_.  I really can't follow what
is happening here.

Since this seems to happen when using xslt, I posted here first.  Should
I instead notify the w3 maintainer?

Versions are as follows:

emacs
GNU Emacs 23.0.60.2 (i686-pc-linux-gnu) of 2008-02-28 on t40

emacspeak
version 27.0 revision 5474m fast dog

w3
WWW p4.0pre.47, URL Emacs

Thanks,
rdc
-- 
Robert D. Crawford                                      rdc1x@xxxxxxxxxxx

BOFH excuse #9:

doppler effect

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