The evaluation of (gensym ()) will crash XLISP. Fix diff follows: XLBFUN.C 210c210 < x = xlarg(&args); --- > if (NULL != (x = xlarg(&args))) -- "Satellites are out tonight" Rob Stanzel ARPA: Rps%MIT-OZ at MIT-MC Apollo Computer UUCP: ...{yale,uw-beaver,decvax!wanginst}!apollo!rps