From: Richard M. Stallman <rms@gnu.org>
Date: Tue, 9 Sep 1997 02:56:56 +0000 (+0000)
Subject: (shell-chdrive-regexp): Likewise.
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(shell-chdrive-regexp): Likewise.
---

diff --git a/lisp/shell.el b/lisp/shell.el
index c28f1649eb6..1b8c9da313a 100644
--- a/lisp/shell.el
+++ b/lisp/shell.el
@@ -235,7 +235,8 @@ This mirrors the optional behavior of tcsh."
       "[]a-zA-Z^_`\\[\\\\]:"
     nil)
   "*If non-nil, is regexp used to track drive changes."
-  :type 'regexp
+  :type '(choice regexp
+		 (const nil))
   :group 'shell-directories)
 
 (defcustom explicit-shell-file-name nil