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Re: defmacro with built-in gensym declaration and initialization

From: Basil L. Contovounesios
Subject: Re: defmacro with built-in gensym declaration and initialization
Date: Wed, 20 Jan 2021 13:46:16 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

akater <nuclearspace@gmail.com> writes:

> I suggest extending ~defmacro~ to support ~&gensym~ keyword in its
> lambda list, for convenient declaration and initialization of gensyms.


> This ~&gensym~ facility eliminates the need for ~with-gensyms~ and
> ~once-only~ in cases when gensyms are created unconditionally by macro
> function (in Common Lisp parlance).

IMO, this minor convenience is insufficient motivation for
conflating/complicating a macro's global arglist, i.e. its arity,
calling convention, etc., with utilities for its local body.  Is there
some other motivation?  Am I missing something?

Why not provide handy gensym/once-only local conveniences for macro
authors instead (some of which already exist in one form or another,
e.g. macroexp-let2, inline-letevals, and org-with-gensyms)?



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