(containing definitions of these types or other behaviour-affecting
defines);
* printers should be defined
-as MPERS_PRINTER_DECL(return_type, function_name)(args),
+as MPERS_PRINTER_DECL(return_type, function_name, args),
inside files that include MPERS_DEFS these printers should be called
as MPERS_FUNC_NAME(function_name)(args), in other files
they should be called just as function_name(args).