From: Glenn Morris <rgm@gnu.org>
To: 12758@debbugs.gnu.org
Subject: bug#12758: letf no longer allows unbound variables
Date: Mon, 29 Oct 2012 03:42:28 -0400 [thread overview]
Message-ID: <cia9v5wwpn.fsf@fencepost.gnu.org> (raw)
Package: emacs
Version: 24.2.50
In Emacs 24.2, this works:
emacs -Q -l cl
(letf ((b))
(setq b 99))
Evaluating this returns `99', and leaves `b' unbound. This behaviour is
documented in cl.texi:
In most cases, the @var{place} must have a well-defined value on
entry to the @code{letf} form. The only exceptions are plain
variables and calls to @code{symbol-value} and @code{symbol-function}.
If the symbol is not bound on entry, it is simply made unbound by
@code{makunbound} or @code{fmakunbound} on exit.
In current trunk, it throws an error:
Symbol's value as variable is void: b
cl-letf does no better than letf.
next reply other threads:[~2012-10-29 7:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-29 7:42 Glenn Morris [this message]
2012-10-29 13:46 ` bug#12758: letf no longer allows unbound variables Stefan Monnier
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