(command_loop_1): Print a message describing the key

the user just pressed when this key has no binding.

src/ChangeLog

 2004-11-25  Stefan Monnier  <monnier@iro.umontreal.ca>
+	* keyboard.c (command_loop_1): Print a message describing the key
+	the user just pressed when this key has no binding.
+
 	* sysdep.c (sys_signal): Don't use SA_RESTART if SYNC_INPUT is set.
 	(emacs_open, emacs_read, emacs_write): Check QUIT when interrupted.

src/keyboard.c

@@ -1618,7 +1618,10 @@ command_loop_1 ()
       if (NILP (Vthis_command))
 	{
 	  /* nil means key is undefined.  */
+	  Lisp_Object keys = Fvector (i, keybuf);
+	  keys = Fkey_description (keys, Qnil);
 	  bitch_at_user ();
+	  message_with_string ("%s is undefined", keys, 0);
 	  current_kboard->defining_kbd_macro = Qnil;
 	  update_mode_lines = 1;
 	  current_kboard->Vprefix_arg = Qnil;