From: Lars Ingebrigtsen <larsi@gnus.org>
To: Shiyao Ma <i@introo.me>
Cc: 22066@debbugs.gnu.org
Subject: bug#22066: 24.5; documentation for "values" is not accurate
Date: Mon, 08 Feb 2021 08:16:03 +0100 [thread overview]
Message-ID: <87blcvm3m4.fsf@gnus.org> (raw)
In-Reply-To: <87zhksiyyl.fsf@mouse.gnus.org> (Lars Ingebrigtsen's message of "Thu, 01 Aug 2019 19:21:06 +0200")
Lars Ingebrigtsen <larsi@gnus.org> writes:
> But I'm not quite sure what the actual semantics are. `eval-expression'
> definitely sets it, but are there other functions that do?
>
> `eval-last-sexp' doesn't, even when given a prefix (when it does read,
> evaluate and print something).
I've looked a bit closed at what the semantics are, and they seem to be
pretty obscure. Here's the only place where we put things on `values':
if (printflag)
{
Vvalues = Fcons (val, Vvalues);
if (EQ (Vstandard_output, Qt))
Fprin1 (val, Qnil);
else
Fprint (val, Qnil);
}
printflag is an option in many functions, so if you say
(eval-region 2 13 t)
then the value will be stored in `values' -- otherwise not. And this
has been this way since at least 1991 (which is the initial revision of
lread.c).
`eval-expression' has this:
(if (null eval-expression-debug-on-error)
(push (eval (let ((lexical-binding t)) (macroexpand-all exp)) t)
values)
etc. So it's being set a few places, and it's used in one single place:
`elisp--eval-defun'.
Anyway, I guess this means that `eval-last-sexp' is just missing a push?
So I've now added that to Emacs 28.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2021-02-08 7:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 5:48 bug#22066: 24.5; documentation for "values" is not accurate Shiyao Ma
2019-08-01 17:21 ` Lars Ingebrigtsen
2021-02-08 7:16 ` Lars Ingebrigtsen [this message]
2021-02-08 16:00 ` Stefan Monnier
2021-02-08 16:15 ` Lars Ingebrigtsen
2021-02-08 17:07 ` Stefan Monnier
2021-02-09 7:37 ` Lars Ingebrigtsen
2021-02-09 7:57 ` Lars Ingebrigtsen
2021-02-09 15:24 ` Stefan Monnier
2021-02-09 15:26 ` Lars Ingebrigtsen
2021-02-09 18:29 ` Stefan Monnier
2021-02-09 18:32 ` Lars Ingebrigtsen
2021-02-09 18:33 ` Lars Ingebrigtsen
2021-02-09 20:29 ` Stefan Monnier
2021-02-09 18:35 ` Lars Ingebrigtsen
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