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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Making hide-ifdef-use-define-alist more user friendly
Date: Tue, 22 Feb 2005 13:12:06 -0500
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    (completing-read "Use define list: " (vconcat (mapcar 'car
    hide-ifdef-define-alist)))

    Allows me to complete more things that those found in:

    (vconcat (mapcar 'car hide-ifdef-define-alist))

The reason for that is that a vector is treated as an obarray.
Obarrays are a special mechanism and they use hidden data structures.
A vector of symbols is not a legitimate argument.