Create a new error for when a char is needed but event-to-character gives nil lisp/ChangeLog addition: 2015-03-14 Aidan Kehoe <kehoea@parhasard.net> * cmdloop.el (no-character-typed): New error, for those cases when a keystroke is to be treated as a character but has no character equivalent. * cmdloop.el (read-char-1): Use it. * keymap.el (synthesize-keysym): Use it. src/ChangeLog addition: 2015-03-14 Aidan Kehoe <kehoea@parhasard.net> * general-slots.h (Qno_character_typed): New error symbol. * event-stream.c (syms_of_event_stream): Define it. New error, for those cases when a keystroke is to be treated as a character in some context but has no character equivalent. * cmds.c (Fself_insert_command): Use it.

--- a/lisp/ChangeLog	Sat Mar 14 01:16:45 2015 +0000
+++ b/lisp/ChangeLog	Sat Mar 14 01:40:49 2015 +0000
@@ -1,3 +1,11 @@
+2015-03-14  Aidan Kehoe  <kehoea@parhasard.net>
+
+	* cmdloop.el (no-character-typed):
+	New error, for those cases when a keystroke is to be treated as a
+	character but has no character equivalent.
+	* cmdloop.el (read-char-1): Use it.
+	* keymap.el (synthesize-keysym): Use it.
+
 2015-03-14  Aidan Kehoe  <kehoea@parhasard.net>
 
 	* cus-start.el (all): Describe help-event-list for Custom.