I have a piece of code under my eyes where rb_define_method is called with the argc parameter at -1. Is this a documented feature of the function and if so what does it do exactly ? Thanks for your help -- Laurent JULLIARD - XR&T Technology and Alliances Office - Open Source team Xerox / 3400 Hillview Ave. PAHV 121 / Palo-Alto CA 94304 / USA Tel/Fax US: +1 650 813 7168 / 6860 - France: +33 4 76 61 5048 / 5199