Guido van Rossum added the comment:

I think you the caller was wrong to pass in [f, f] in the first place.

In asyncio, the argument is converted into a set before using it, but there's 
still a bug if you pass it a list containing two references to the same 
coroutine -- it gets wrapped in two separate Futures. I think the better 
behavior is to convert to a set first and then map coroutines to Futures.

So concurrent.futures should also convert to a set first.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20367>
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