Should `unchecked-multiply` throw an exception in this case? (see also:
http://stackoverflow.com/questions/33306984/why-does-my-hash-function-fail-with-arithmeticexception-integer-overflow-even/33308956#33308956
)
user> (reduce unchecked-multiply (range 1 22))
ArithmeticException integer overflow clojure.lang.Numbers.throwIntOverflow
(Numbers.java:1388)
The loop-recur version also fails, unless you use a type hint:
user> (loop [n 1
r (range 1 22)]
(if-let [a (first r)]
(recur (unchecked-multiply n a) (next r))
n))
ArithmeticException integer overflow clojure.lang.Numbers.throwIntOverflow
(Numbers.java:1388)
user> (loop [n 1
r (range 1 22)]
(if-let [^long a (first r)]
(recur (unchecked-multiply n a) (next r))
n))
-4249290049419214848
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