From: Chong Yidong <cyd@stupidchicken.com>
To: Daniel Colascione <daniel@censorshipresearch.org>
Cc: Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: Why isn't the string returned by symbol-name read-only?
Date: Sat, 23 Jan 2010 16:53:57 -0500 [thread overview]
Message-ID: <87vdespjwq.fsf@stupidchicken.com> (raw)
In-Reply-To: <4B5B6250.1080108@censorshipresearch.org> (Daniel Colascione's message of "Sat, 23 Jan 2010 15:55:44 -0500")
Daniel Colascione <daniel@censorshipresearch.org> writes:
> Consider
>
> (let ((name (symbol-name 'foo)))
> (aset name 0 ?x)
> (cons name (symbol-name 'foo)))
>
> That yields ("xoo" . " xoo")
>
> Now try
>
>
> (let ((name (symbol-name 'car)))
> (aset name 0 ?x)
> (cons name (symbol-name 'car)))
>
> That returns in an error when you try to evaluate it. The object
> returned by (symbol-name 'car) must have some read-only bit set.
>
> Why isn't that bit set for *all* symbol names?
Users will always have enough rope to hang themselves. I don't think we
need to lose sleep over this, unless this is demonstrated to be a
problem in the real world.
next prev parent reply other threads:[~2010-01-23 21:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-23 20:55 Why isn't the string returned by symbol-name read-only? Daniel Colascione
2010-01-23 21:53 ` Chong Yidong [this message]
2010-01-24 0:33 ` alin.s
2010-01-24 9:48 ` Thien-Thi Nguyen
2010-01-24 1:12 ` Davis Herring
2010-01-24 11:19 ` alin.s
2010-01-25 3:08 ` Stefan Monnier
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