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From: Tom <adatgyujto@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: hash strangeness
Date: Mon, 3 Nov 2014 21:29:17 +0000 (UTC)	[thread overview]
Message-ID: <loom.20141103T221539-429@post.gmane.org> (raw)
In-Reply-To: barmar-14233C.17480902112014@88-209-239-213.giganet.hu

Barry Margolin <barmar <at> alum.mit.edu> writes:
> > 
> > I expect '(a b c) to create a new list with these symbols
> > every time it runs.
> 
> Why do you expect that?
> 
> '(a b c) is short for (quote (a b c)). quote returns its argument, it 
> doesn't make a copy of it.

Okay, but when I write '(a b c) in a function then I'd consider it
an ad hoc list in the current context in the function, not as an object
which outlives the exiting of the function and then returns in the
next invocation, unexpectedly connecting the different invocations.


> I'm sure somewhere in the Elisp programming manual it mentions that you 
> shouldn't use destructive functions on literal lists, like the Common 
> Lisp spec does.

Well, the quoting page doesn't mention it:

https://www.gnu.org/software/emacs/manual/html_node/elisp/Quoting.html






  reply	other threads:[~2014-11-03 21:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-02 11:20 hash strangeness Tom
2014-11-02 12:09 ` Tom
2014-11-02 18:20   ` Thien-Thi Nguyen
2014-11-02 20:45     ` Tom
     [not found]     ` <mailman.12618.1414961152.1147.help-gnu-emacs@gnu.org>
2014-11-02 22:25       ` Pascal J. Bourguignon
2014-11-02 22:48       ` Barry Margolin
2014-11-03 21:29         ` Tom [this message]
2014-11-04  1:57           ` Robert Thorpe
2014-11-04  2:16           ` Michael Heerdegen
     [not found]       ` <<barmar-14233C.17480902112014@88-209-239-213.giganet.hu>
2014-11-04  3:04         ` Drew Adams
2014-11-04  7:39           ` Marcin Borkowski
     [not found] <mailman.12577.1414927271.1147.help-gnu-emacs@gnu.org>
2014-11-02 18:43 ` Pascal J. Bourguignon
2014-11-02 20:48   ` Tom

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