I'm trying to understand infinite sequences.

Wikipedia defines an implementation of the Fibonacci sequence as:

(def fibs (cons 0 (cons 1 (lazy-seq (map +' fibs (rest fibs))))))

However, when I wrote fibs in the repl as:

(def fibs (lazy-seq (cons 0 (cons 1 (map +' fibs (rest fibs))))))

executing (first fibs) produces a StackOverflow exception.

What is the reason that the second, incorrect definition throws a 
StackOverflow exception, but the first generates an infinite sequence?

Thanks.

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