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About `macroexpand'

From: Xue Fuqiao
Subject: About `macroexpand'
Date: Sun, 30 Dec 2012 10:39:31 +0800 
I wrote the following code:
(defmacro t-becomes-nil (variable)
  (if (eq variable t)
      (setq variable nil)))
(setq foo t)
(macroexpand '(t-becomes-nil foo))

The return value of `macroexpand' is nil.  I don't know why.  I think it should 
be:
(if (eq foo t)
    (setq foo nil)))

Can anybody help?
-- 
Best regards.
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