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I believe the for and doseq documentation (at least docstrings) fail to explain the semantics of the :while modifier. The existence is documented, but not the behavior.

I would like to request that the doctoring be updated, especially since it behaves in what I believe is a reasonable but counter-intuitive way. I believe a reasonable person would expect that :while false would trigger the for or doseq to exit; however it does not. Rather it causes the inner-most loop containing the :while to exit, but most notably the outer loops continue to iterate.

Another discussion of this can be found here: clojurians

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