* Short term
+** scan-code.l
+Avoid variables for format strings, as then GCC cannot check them.
+show_sub_messages should call show_sub_message.
+
+** m4 names
+b4_shared_declarations is no longer what it is. Make it
+b4_parser_declaration for instance.
+
** Variable names.
What should we name `variant' and `lex_symbol'?