[3.6] bpo-31641: Allow arbitrary iterables in concurrent.futures.as_completed()
(GH-3830)
#3831
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This was possible before. GH-1560 introduced a regression after 3.6.2 got
released where only sequences were accepted now. This commit addresses this
problem.
(cherry picked from commit 574562c)
https://bugs.python.org/issue31641