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

From: Andy Wingo
Subject: Re: Anything better for delayed lexical evaluation than (lambda () ...)?
Date: Sat, 03 Dec 2011 17:44:21 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)

On Sat 03 Dec 2011 16:45, David Kastrup <address@hidden> writes:

> Hi, if I have something read that is evaluated later, the lack of
> procedure-environment in Guilev2 implies that I have to wrap the stuff
> in (lambda () ...) in order to capture the lexical environment for
> evaluation.
> Is it possible to have a shortcut (make-closure ...) or so for that
> purpose?  The reason is that if ... is a call to a
> procedure-with-setter, (lambda () ...) actually does not cut it for
> capturing the semantics of ..., and I need
> (make-procedure-with-setter (lambda () ...)
>                             (lambda (x) (set! ... x)))
> But x is not hygienic, so this is again too simplistic.  And a separate
> macro make-closure also could decide that the expression is pure anyway
> and not go to the pain of creating an actual closure.

I'm having a hard time parsing this, as it is very high level.  Could
you give an example of what you are trying to do?



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