From: Drew Adams <drew.adams@oracle.com>
To: Pedro Andres Aranda Gutierrez <paaguti@gmail.com>,
emacs-devel <emacs-devel@gnu.org>
Subject: RE: [External] : PATCH: Explicitly show how let works on global-variables
Date: Tue, 4 Oct 2022 15:00:54 +0000 [thread overview]
Message-ID: <SJ0PR10MB54888F29304AF92906E47B44F35A9@SJ0PR10MB5488.namprd10.prod.outlook.com> (raw)
In-Reply-To: <CAO48Bk_9Wksepn2PQV-DPxGYAi4KXN6gfUQkZaFp1DV6HQrNAg@mail.gmail.com>
This isn't quite correct:
When you use a system-wide variable in
@code{let}, its value is modified in its
scope and then restored.
1. I'm guessing that by "system-wide" (which is not
defined) you mean a "special", i.e., "dynamic" var.
2. Dynamic binding has no notion of scope, actually.
It's instead about duration: the binding has dynamic
_extent_: it remains in effect until the `let' is
finished.
See CLTL2, section "Scope and Extent": https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node43.html
("The term 'dynamic scope' is a misnomer. Nevertheless
it is both traditional and useful.")
prev parent reply other threads:[~2022-10-04 15:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-04 6:46 PATCH: Explicitly show how let works on global-variables Pedro Andres Aranda Gutierrez
2022-10-04 7:52 ` Eli Zaretskii
2022-10-04 8:09 ` Pedro Andres Aranda Gutierrez
2022-10-04 11:36 ` Phil Sainty
2022-10-04 13:43 ` Stefan Monnier
2022-10-04 22:22 ` Tim Cross
2022-10-05 5:28 ` Pedro Andres Aranda Gutierrez
2022-10-06 9:00 ` Pedro Andres Aranda Gutierrez
2022-10-06 19:34 ` Emanuel Berg
2022-10-04 17:39 ` Richard Stallman
2022-10-04 7:59 ` tomas
2022-10-04 11:56 ` Phil Sainty
2022-10-04 13:48 ` Stefan Monnier
2022-10-05 21:31 ` Richard Stallman
2022-10-04 15:00 ` Drew Adams [this message]
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