Wow. This is impressive. I especially like the way you've documented it all -- a habit we should all acquire. Regarding the patch: I think it would be a bit more readable if it were a unified diff. (see etc/BETA for all the gory details about sending diffs.) I haven't looked at the Mule-state of the sources, but the following example caught my eyes: + DEFUN ("my-function", Fmy_function, 1, 1, "FFile name: ", /* + Sample Emacs primitive function. + + The specified FILE is frobricated before it is fnozzled. + */ + (file)) + ＠{ + char *filename; + + if (NILP(file)) + return Qnil; + + filename = (char *)XSTRING_DATA(file); + frob(filename); + return Qt; + ＠} This is clearly wrong -- FILE is a Lisp string, so XSTRING_DATA (file) is a string of Bufbytes, not of chars. Just casting it to char * is wrong, unless frob() is ready to work with FILENAME in the internal Emacs representation -- but in that case it should accept a Bufbyte * argument, so no cast should be necessary. This is probably nitpicking, but such is Mule, and at least our examples should be, well, exemplary. :-)