(defmacro foobar []
  `'(+ a b))

(let
    [a 5
     b 6]
  (eval (foobar)))

I know that the above is completely useless but I'm just trying to get
an intuitive understanding of how macros work under Clojure.  At the
REPL when I try to evaluate the second form, I get an null pointer
exception.  Why can't the result of the foobar macro access the values
of a and b?

Many thanks,
David

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