Re: Lexical environment for functions?

[David Kastrup <dak@gnu.org>]

Stefan Monnier <monnier@iro.umontreal.ca> 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