Allow cond-like specification of expression pairs and allow odd number
of expressions. Let odd expressions in last position serve as default
return value. There will be no impact on previous reading/writing of
"if". Stolen from Paul Graham's Arc.
(defmacro myif
([x] x)
([x y] (if x y))
([x y & z] (if x y `(myif [EMAIL PROTECTED]))))
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