Re: Macros: Scheme vs Common Lisp
At 02:20 PM 8/26/98 +0200, Michael Sperber [Mr. Preprocessor] wrote:
>>>>> "Holger" == Holger Schauer
<schauer(a)coling.uni-freiburg.de> writes:
>>>>> "MS" == Michael Sperber schrieb am 26 Aug 1998 12:14:52
+0200:
MS> Can you explain to me why the above should lead to a different
MS> result? CLISP's output is exactly what I expected it to be:
MS> (setq bar 23)
MS> (defmacro foo () bar) ; this means (foo) expands to the value of BAR
Holger> Isn't this meant to mean to refer to the current binding of bar,
which
Holger> in this case happens to be 23 ?
What do you mean by "current"? BAR is supposed to refer to the
binding introduced by (setq bar 23), which is the lexically enclosing
one. The question is: when is the binding resolved?
At macro expansion time.
Craig Lanning
E-Mail: CraigL(a)InternetX.net