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Re: Lexical environment for functions?

From: David Kastrup
Subject: Re: Lexical environment for functions?
Date: Sun, 28 Dec 2014 07:40:59 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> Does that mean that lexical environments exist only for value cells?
> Yes, at least for the "native" lexical binding.
>> Because it would seem convenient, if one has some
>> Lisp-like presentation of a parse tree like XML, to just eval it with a
>> number of function bindings in place.
> Just like you could simulate the new (eval E ENV) form via
> (eval `(lexical-let ,ENV ,E)), you can do the above with
> (eval `(cl-flet FENV E)).

cl-flet is optimized for compilation rather that interpretation.  So
this is not likely to make eval a good idea for fast interpretation of
parsed expressions.

David Kastrup

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