[issue21209] q.put(some_tuple) fails when PYTHONASYNCIODEBUG=1

[Guido van Rossum]

Guido van Rossum added the comment:

Heh. METH_O was *also* a red herring.  But upstream (Tulip) issue 163 *was* a good clue. I now believe that the real bug is that CoroWrapper.__iter__() has "return self" rather than "return iter(self.gen)". That fix is in the 2nd attachment.

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Added file: http://bugs.python.org/file34809/gen_send_2.diff

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