(eshell-windows-shell-file): Fix :type.

diff --git a/lisp/eshell/esh-ext.el b/lisp/eshell/esh-ext.el
index 3fb9551d7fe2fd434e8bbee1b99dfb2347c261cd..05825d4cc3cc47fa6d86742b41fe7111840d8e09 100644 (file)
--- a/lisp/eshell/esh-ext.el
+++ b/lisp/eshell/esh-ext.el
@@ -98,7 +98,7 @@ since nothing else but Eshell will be able to understand
   "*The name of the shell command to use for DOS/Windows batch files.
 This defaults to nil on non-Windows systems, where this variable is
 wholly ignored."
-  :type 'file
+  :type '(choice file (const nil))
   :group 'eshell-ext)
 
 (defsubst eshell-invoke-batch-file (&rest args)