I was implementing a lazy infinite Fibonacci sequence as an exercise,
and it wasn't working. I remembered that I had seen a working example
somewhere, Googled it, and up it came. And it works, but mine, while
similar (and I've modified the two versions to make them even more
similar except for the problem)...mine fails:
;; works: (take 7 fib-seq1) => (1 1 2 3 5)
(def fib-seq1
((fn rfib [a b]
(lazy-seq (cons a (rfib b (+ a b)))))
1 1))
;; fails: (take 7 fib-seq2) => IllegalArgumentException: Don't know
how to create ISeq from: user$fib_seq2
(defn fib-seq2
([] (fib-seq2 1 1))
([a b]
(lazy-seq (cons a (fib-seq2 b (+ a b))))))
Any clue as to why the second version fails? (This is with with
clojure "1.3.0")
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