font-lock is broken

[Michael Kifer]

In the current CVS version as of today:
GNU Emacs 22.0.50.8 (i686-pc-linux-gnu, X toolkit) of 2005-07-15 

Make a buffer with this content:

In-reply-to: "foo bar" of Fri, 15 Jul 2005 20:31:33 EDT
--------

(2 lines only)
Then
M-x mh-letter-mode
M-x font-lock-fontify-buffer

You get:
font-lock-default-fontify-region: Wrong type argument: number-or-marker-p, nil