Cannot send a bug report

[Katsumi Yamaoka]

Hi,

The following change blocks execution of M-x report-emacs-bug.

;;; sendmail.el --- mail sending commands for Emacs.
----------------------------
revision 1.275
date: 2004/03/04 19:58:24;  author: monnier;  state: Exp;  lines: +3 -1
(mail-mode): Set comment-start-skip.
----------------------------

There's no ChangeLog entry.  Here's a backtrace:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  regexp-quote(nil)
  (concat "^" (regexp-quote mail-yank-prefix) "[        ]*")
  (set (make-local-variable (quote comment-start-skip)) (concat "^" 
(regexp-quote mail-yank-prefix) "[  ]*"))

[...]

* call-interactively(report-emacs-bug)
-- 
Katsumi Yamaoka <address@hidden>