John Boyle scripsit: > Can you explain further, perhaps give code that works? I've used let, > flet, and macrolet to rebind cl:if, and tried to run defmacro under that > binding, and none of them worked (in CLisp or SBCL).
IF is a symbol in the CL package, and attempts to rebind or redefine symbols in that package don't work. So you need to create a symbol in some other package by saying (shadow 'if), which forces the current package to contain a separate IF symbol unrelated to CL:IF. You can then define that however you want. In standard Scheme there are no packages, so there is only one symbol named "if". However, you can rebind or redefine it as you will. In R6RS and R7RS, you need to exclude it when you import the base library. -- John Cowan http://www.ccil.org/~cowan [email protected] Uneasy lies the head that wears the Editor's hat! --Eddie Foirbeis Climo _______________________________________________ Scheme-reports mailing list [email protected] http://lists.scheme-reports.org/cgi-bin/mailman/listinfo/scheme-reports
