Subject: Re: declaring something to be NOT special... From: Erik Naggum <email@example.com> Date: 1998/12/04 Newsgroups: comp.lang.lisp Message-ID: <firstname.lastname@example.org> * David Bakhash <email@example.com> | how, in Lisp, do I specifically declare a variable to be NON-special? sorry, there's no (standard) way to do that. (you might still succeed in resetting the flag that makes the compiler believe a symbol has special binding -- I've had to do that in a running system.) | I'm afraid that with ACL, if you leave out the (declare (special ...)) | because you specifically don't want that variable to be declared special, | then the compiler assumes it to be, and this may alter the running of the | code. this is dead wrong. what happens if you have an unbound variable in your code is that Allegro CL treats it _as_if_ it were declared special, i.e., it _assumes_ it is special for that function (or the smallest enclosing lexical scope, actually), it does _not_ declare it special for you. here's an example: CL-USER(33): (compile nil (lambda (x) (+ x y))) ; While compiling (:anonymous-lambda 25): Warning: Free reference to undeclared variable y assumed special. #<Function (:anonymous-lambda 25) @ #x20791422> t t this means that the code goes to look for Y in the dynamic environment as it would a special variable. (if you can't make this form work because COMPILE barfs on interpreted function objects, let me know, and I'll send you a patch I have made that has not yet made the official rounds at Franz Inc.) #:Erik -- The Microsoft Dating Program -- where do you want to crash tonight?