From: Mark Oteiza <mvoteiza@udel.edu>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] master 4612b2a 1/2: Implement and-let*
Date: Tue, 12 Sep 2017 13:29:58 -0400 [thread overview]
Message-ID: <20170912172958.GA11109@holos.localdomain> (raw)
In-Reply-To: <jwvvaknhm0l.fsf-monnier+emacsdiffs@gnu.org>
On 12/09/17 at 01:21pm, Stefan Monnier wrote:
> > (internal--build-binding-value-form): Extend to account for
> > solitary symbols and (EXPR) items in binding varlist.
>
> We're forced to accept those forms in `let` and `let*` for historical
> reasons, but why do we want to also accept them in newer constructs?
Solitary symbols are expanded as x -> (x (and PREV x)), so it's not the
historical behavior. (EXPR) means EXPR is an s-expression, which
doesn't make sense in let or let*, e.g.:
(let (x)
(and-let* (((null x))) "it's null"))
next prev parent reply other threads:[~2017-09-12 17:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170912171813.26498.77867@vcs0.savannah.gnu.org>
[not found] ` <20170912171815.13B9520DE6@vcs0.savannah.gnu.org>
2017-09-12 17:21 ` [Emacs-diffs] master 4612b2a 1/2: Implement and-let* Stefan Monnier
2017-09-12 17:29 ` Mark Oteiza [this message]
2017-09-13 16:39 ` Richard Stallman
2017-09-14 15:46 ` Michael Heerdegen
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