From: "Drew Adams" <drew.adams@oracle.com>
To: "'kj'" <no.email@please.post>, <help-gnu-emacs@gnu.org>
Subject: RE: How to rescind a defun?
Date: Fri, 18 May 2012 15:09:16 -0700 [thread overview]
Message-ID: <04A0ECB15DCC470685337FFC04605BBA@us.oracle.com> (raw)
In-Reply-To: <jp6g51$7$1@reader1.panix.com>
> >> If, during an Emacs session, one evaluates a defun that
> >> (inadvertently) redefines an existing function, is it
> >> possible to undo this?
>
> > See function `fmakunbound'.
>
> Thanks, I would have never found this!
>
> Unfortunately, it seems that the original definition is gone. (I
> had hoped that the new definition was just shadowing the original
> one, so that rescinding the former would "resurrect" the latter.)
I see now what you meant by "undo".
No, within a given namespace (obarray) and a given program scope (e.g. `flet' or
`labels' binding), a symbol has only one function definition.
And for a global function definition, assignment is used, not binding. So there
is no shadowing.
next prev parent reply other threads:[~2012-05-18 22:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-18 20:13 How to rescind a defun? kj
2012-05-18 20:36 ` Drew Adams
[not found] ` <mailman.1365.1337373409.855.help-gnu-emacs@gnu.org>
2012-05-18 21:49 ` kj
2012-05-18 22:09 ` Drew Adams [this message]
2012-05-18 22:16 ` Barry Margolin
2012-05-19 2:52 ` Pascal J. Bourguignon
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