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Re: Using a macro with FOLD alters FOLD procedure!

From: Neil Jerram
Subject: Re: Using a macro with FOLD alters FOLD procedure!
Date: Sat, 23 Apr 2005 21:18:33 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.6) Gecko/20050324 Debian/1.7.6-1

Kevin Ryde wrote:
I suppose it depends if a macro should be a first class object to be
thrown around (or do I misunderstand?).

I've been gradually converting srfi-1 procs to C, which has the side
effect of checking the procs are actual procedures.  I suppose there
must be plenty of ordinary application code passing procedures around
in exactly the same way that's vulnerable to memoizing macros.

(Could a memoized form check it's got the same macro as originally
expanded, as a safety check?  Or do I misunderstand again?)

I think you understand fine - to the extent that I understand myself, anyway.

For reference, here's the first message in the 2002 thread that I mentioned:

The key mail in this thread is probably Marius's one. I have to say, though, that I don't yet understand how Marius's solution would solve the problem in the case of passing a macro to fold.


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