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From: Katsumi Yamaoka <yamaoka@jpl.org>
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Subject: Re: [gnus git]  branch master updated: =1= message: insert mail-header-separator read-only and intangible
Date: Fri, 04 Feb 2011 09:14:59 +0900
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Julien Danjou <julien@danjou.info> wrote:
> +	(message-setup-1): Insert mail-header-separator with read-only and
> +	intangible properties set.
[...]
> +  (let ((message-forbidden-properties nil))
> +    (insert (propertize (concat mail-header-separator "\n")
> +                        'read-only t 'rear-nonsticky t 'intangible t)))

Why does it need to let-bind?  Emacs 22 and 23 say:

In message-setup-1:
message.el:6447:10:Warning: attempt to let-bind constant
    `message-forbidden-properties'