From: Marcin Borkowski <mbork@mbork.pl>
To: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
Subject: Re: `pp-eval-expression' behaves strangely under lexical binding
Date: Sun, 17 Apr 2016 16:33:10 +0200 [thread overview]
Message-ID: <87mvostie1.fsf@mbork.pl> (raw)
In-Reply-To: <87pototkq5.fsf@mbork.pl>
On 2016-04-17, at 13:43, Marcin Borkowski <mbork@mbork.pl> wrote:
> Hi all,
>
> put this in an empty buffer, call `normal-mode' (so that
> `lexical-binding' is set to t) and evaluate:
>
> --8<---------------cut here---------------start------------->8---
> ;;; -*- lexical-binding: t; -*-
> (setq spam 'eggs)
> (let ((spam 'bacon))
> (pp-eval-expression 'spam)
> (message "%s" spam))
> --8<---------------cut here---------------end--------------->8---
>
> Then look at *Messages*: "eggs" is printed, then "bacon".
>
> I wanted to use `pp-eval-expression' when debugging (basically as
> a pretty-printing variant of `message'), and this behavior hit me. Why
> does this behave in this way, and is it a feature or a bug?
OK, never mind: `pp-eval-expression' is defined in Lisp, so it cannot
work any other way.
But isn't my question still valid for `symbol-value'?
Best,
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University
next prev parent reply other threads:[~2016-04-17 14:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-17 13:43 `pp-eval-expression' behaves strangely under lexical binding Marcin Borkowski
2016-04-17 14:33 ` Marcin Borkowski [this message]
2016-04-17 16:15 ` Stefan Monnier
2016-04-17 17:42 ` Marcin Borkowski
2016-04-18 15:07 ` Andy Moreton
2016-04-18 15:58 ` Stefan Monnier
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