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questions about IF
Date: Fri, 10 Jun 88 14:03:06 EST
I just noticed something strange about the Symbolic's IF:
So the else-clause to an IF is an implicit PROGN.
This is NOT in the Common-Lisp language specification?
This is a documented feature of Symbolics' CL implementation.
Personally I think they should keep scl extensions (like LOOP keywords,
IF, and defun with a non-symbol as its name) out of CL, but I can
understand why that's hard to do.
Personally I believe it is an error since the code looks so funny :^)
Personally I prefer it, but if you don't like it write your own if macro
(but be sure to shadow lisp:if when you build your package).
Someone said recently in this group that IF is now a more primitive than
the COND. Can I get more details on this? How could they have done this? Does
my code run faster now if I use Ifs than if I use Conds?
I was surprised to hear Moon say this, because it seems like a red
herring. What does "more primitive" imply in an environment with
macros? Who cares whether a expands into B or vice versa?