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Re: [PATCH] Implement local-eval, local-compile, and the-environment

From: Andy Wingo
Subject: Re: [PATCH] Implement local-eval, local-compile, and the-environment
Date: Sat, 14 Jan 2012 17:34:32 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)

Hi Mark,

On Sun 08 Jan 2012 21:39, Mark H Weaver <address@hidden> writes:

>>>> Are there some short primitives that psyntax could export that
>>>> would make it possible to implement `the-environment' in a module?
>>> * The list of ordinary variables (these need to be boxed)
>>> * The list of simulated variables (we need to reuse the original box)
>> A special form to get all visible variables, and syntax-local-value plus
>> a weak hash to do the optimization?
> We could do it that way, but that strategy would not extend nicely to a
> more complete implementation, where local syntactic keywords are
> captured.

Why not?  Syntax-local-value can provide the macro transformer.

It still seems to me that this is an attractive option, especially if we
are to introduce syntax-local-value anyway.


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