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bug#18337: 24.4.50; apropos fails on "scroll"

From: Stefan Monnier
Subject: bug#18337: 24.4.50; apropos fails on "scroll"
Date: Thu, 28 Aug 2014 09:17:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> (when (setq properties (symbol-plist 'vertical-scroll-bar))
>   (setq doc (list (car properties)))
>   (while (setq properties (cdr (cdr properties)))
>     (setq doc (cons (car properties) doc)))
>   (nreverse doc))

> => (0 event-symbol-element-mask event-symbol-elements modifier-cache 
> variable-documentation)
> Applying 'symbol-name to that list then yields the error.

Note that, while convention is to use a symbol for property names, that
is not the only valid choice.  0 is a valid property name (tho an odd
one, arguably).

So while this 0 should probably be changed the mapconcat code that burps
on it should probably be changed not to assume that only symbols will
be used as property names.


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