[toronto-lisp] May meeting

[Vishvajit Singh]

> This code is practically the simplest code walker possible

I was premature in saying this. That code is longer than it needs to
be because it's doing some clever stuff, including trying to be fully
portable.

If you look at pg.11 of the 2nd paper in the linked document:
http://www.merl.com/reports/docs/TR93-17.pdf
there is a simpler code walker that also performs macroexpand-all.

Vish

On Tue, May 18, 2010 at 12:29 AM, Vishvajit Singh
<vishvajitsingh at gmail.com> wrote:
> That is really interesting, but.. geez! It really drives home that
> Common Lisp has too many special forms. This code is practically the
> simplest code walker possible and it's still 300 lines.
>
> I always wondered why, for example, both LET and LET* need to be
> special forms, or why both FLET and LABELS need to be. It seems like
> only one needs to be a special form, and the other could be
> implemented as a macro on top of the other. TAGBODY seems like it
> could be written as a macro if your implementation has tail-call
> optimization. (I'd be interested to see someone give that a try.)
>
> One of the wonderful things in the original conception of Lisp is the
> small number of primitives:
> http://lib.store.yahoo.net/lib/paulgraham/jmc.lisp
>
> Vish
>
> On Fri, May 14, 2010 at 8:49 AM, Brian Connoy
> <BConnoy at morrisonhershfield.com> wrote:
>> Justin, you've probably dug this up already.  Have a gander at:
>> http://john.freml.in/macroexpand-dammit
>>
>> BC
>>
>>
>>
>> On Tue, May 11, 2010 at 12:24:54PM -0400 or thereabouts, Justin Giancola wrote:
>>> While I don't have a presentation per se, I'd like to propose a
>>> discussion on macro hygiene and scoping inspired by ideas encountered
>>> in Doug's book. I'm going to try to get together a few examples during
>>> lunch at work.
>>
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