(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.
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