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From: Navy Cheng <navych@126.com>
Newsgroups: gmane.emacs.help
Subject: How to use a symbol and its value to create alist?
Date: Tue, 11 Aug 2015 21:52:54 +0800
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For example:

(setq a 1)
(setq b 2)
(setq c 3)

How can I a alist, like:
((a . 1) (b . 2) (c .3))

The value of a, b and c may change, so don't do this like
(setq tree ((a . 1) (b . 2) (c .3)))

Thank you!