On May 31, 2012, at 9:14 AM, michaelr524 <michaelr...@gmail.com> wrote:

> Why the following triggers infinite realization of the infinite lazy
> seq

You've catted together an infinite seq of empty seqs, and forcing a lazy seq 
doesn't stop until either an element or known emptiness is found, whereas you 
provide neither. Consider: should the following terminate?

(doall (filter #(< % 42) (range)))

> and how I can work around it and make it stop when f1 returns an
> empty seq,

You need a sentinel so you can use take-while, or another code path in f2 that 
provides the aforementioned termination condition.

-- 
Stephen Compall
Greetings from sunny Appleton!

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