FROM: BACHER, STEPHEN E. SENT ON: 07/01/85 AT 08:04 DATE - 07/01/85 Reply to CL flame on disallowing NIL as a feature: If you make it an error (signalled or otherwise) for NIL to be a feature, then an awful lot of Macsyma source code will break, for NIL (the language, that is) is used as a feature name throughout in #+/#- conditionals.