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Re: Anything better for delayed lexical evaluation than (lambda () ...)?

From: Mark H Weaver
Subject: Re: Anything better for delayed lexical evaluation than (lambda () ...)?
Date: Wed, 14 Dec 2011 06:03:51 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)

Andy Wingo <address@hidden> writes:
> On Wed 14 Dec 2011 08:50, Mark H Weaver <address@hidden> writes:
>> I have successfully implemented the (capture-lexical-environment)
>> special form in the evaluator, and also primitive-local-eval.
> I dunno, Mark.  That's a neat hack, but why should we have it in Guile?
> It can't compile.  It's not for efficiency, because if you wanted more
> efficiency, you would compile.  So what is it for?  It has a cost, so it
> needs to justify itself.

For starters, it's for handling languages like Lilypond, which
fundamentally _cannot_ be compiled.  It's not a question of
implementation strategy.  Even if someone were willing to rewrite
Lilypond's implementation from scratch, I have become convinced that it
cannot be compiled without redesigning the language itself.

More generally, it's to increase the generality and flexibility of
Guile.  One of the things I like most about Scheme is that it is
powerful enough to implement just about anything on top of it, using
just about any strategy you wish, in a simple, straightforward manner,
thanks to advanced features like macros and continuations.

I found it somewhat embarrassing that Guile 2.0 was unable to gracefully
support a language that Guile 1.8 handled beautifully.  I would like to
fix that.

Also, I think that it is crucially important to keep the Lilypond
developers happy with Guile.  We don't have very many users.  We should
make an effort to keep our existing users happy.


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