From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Helmut Eller <eller.helmut@gmail.com>
Cc: 16728@debbugs.gnu.org
Subject: bug#16728: 24.3.50; bug? (with-temp-buffer (insert "foo")) deactivates mark in current buffer
Date: Fri, 14 Feb 2014 12:21:27 -0500 [thread overview]
Message-ID: <jwvioshobsv.fsf-monnier+emacsbugs@gnu.org> (raw)
In-Reply-To: <m27g90zgv6.fsf@gmail.com> (Helmut Eller's message of "Wed, 12 Feb 2014 12:54:05 +0100")
> (list (with-temp-buffer
> (set (make-local-variable 'deactivate-mark) nil)
> (insert "foo")
> (let (deactivate-mark)
> (with-temp-buffer
> (insert "bar"))))
> deactivate-mark)
The `let' above dynamically binds the `deactivate-mark' of the first
temp-buffer. The (insert "bar") then set the deactivate-mark in the
second temp-buffer, which did not make it buffer-local, so it really
sets the global deactivate-mark. Try:
(with-temp-buffer
(let ((a 3)
(buf (current-buffer)))
(make-local-variable 'a)
(let ((a 4))
(with-temp-buffer
(message "a=%S but a=%S" (list a (local-variable-p 'a))
(with-current-buffer buf
(list a (local-variable-p 'a))))))))
Interaction between let-bindings and buffer-local bindings is tricky.
Stefan
next prev parent reply other threads:[~2014-02-14 17:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-12 8:53 bug#16728: 24.3.50; bug? (with-temp-buffer (insert "foo")) deactivates mark in current buffer Oleh
2014-02-12 11:54 ` Helmut Eller
2014-02-14 17:21 ` Stefan Monnier [this message]
2014-02-14 18:12 ` Helmut Eller
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