Re: [PATCH] Adding with-gensyms and once-only to subr-x

[Sean Whitton <spwhitton@spwhitton.name>]

Hello,

On Mon 11 Apr 2022 at 01:26PM -04, Stefan Monnier wrote:

> How 'bout making `macroexp-let2*` accept the shorter form as in the
> patch below?

Nice.  Good with me.  (I thought about extending macroexp-let2* but
didn't think about the idea of making the first argument optional.)

> I'm not in love with the name `macroexp-let2*` but I find the name
> `once-only` to lack context.  So we could consider renaming, but I'd
> favor making it live in `macroexp.el` (and come with a `macroexp-`
> prefix).  It could be called `macroexp-once-only` or
> `macroexp-eval-now`, or we could go crazy with names like
> `macroexp-copyableize`.

How about I add an alias cl-once-only, maybe which doesn't accept the
TEST argument at all?  It can go in cl-macs.el.

'once-only' is the very well-established CL name for this macro,
referenced in all of "Practical Common Lisp", "Paradigms of AI
Programming", "Let Over Lambda" and I think "On Lisp" too.  Speaking as
someone who has written more CL than Elisp, I would find it helpful to
have it under that name, and I should think others would too.

-- 
Sean Whitton