I have more information on this now, and it is definitely a bug in
Clojure -- defmacro within a let doesn't work correctly. Consider the
following file:
--- BEGIN foo1a.coj ---
(ns com.ksvanhorn.foo1a)
(let [dummy 0]
(defmacro add [& args] `(unchecked-add ~...@args))
(defmacro mul [& args] `(unchecked-multiply ~...@args))
(let [magic 1812433253
x 5489
v (add 1 (mul magic x))]
(println (str "v: " v))))
--- END ---
If I type "(use 'com.ksvanhorn.foo1a)" at the REPL, I get
v: (clojure.core/unchecked-add 1 (clojure.core/unchecked-multiply
1812433253 5489))
printed out and nil returned, but if I just type
(uncheck-add 1 (unchecked-multiply 1812433253 5489))
I get 1301868182.
Although in this case the defmacro doesn't need to be inside the let,
I actually have a real need for doing defmacro inside a let -- I have
a computed constant that I want to use in several places, and one of
those places is in the macro definition.
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