validator.nu claims CONTROL_CHARACTER in QUERY from cvsweb?

For no particular reason, I checked this page with validator.nu:
  http://dev.w3.org/cvsweb/2008/test-harness/

One of the diagnostics I got baffled me:

--8<--
Error: Bad value testsuite.php?rev=1.2&stWWW/w3c_home$
--d��content-type=text/x-cvsweb-markup for attribute href on element a:
CONTROL_CHARACTER in QUERY.

>From line 37, column 17; to line 37, column 85

td>&nbsp;<A
HREF="testsuite.php?rev=1.2&amp;content-type=text/x-cvsweb-markup"><b>1.2


Syntax of IRI reference:
        Any URL. For example: /hello, #canvas, or http://example.org/.
--8<--

huh? The string "w3c_home$" doesn't occur in the source of the page.
Nor does "stWWW". What's going on here?

-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
gpg D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E