[issue27243] __aiter__ should return async iterator instead of awaitable

[Roundup Robot]

Roundup Robot added the comment:

New changeset a0d50aad7b02 by Yury Selivanov in branch '3.6':
Issue #27243: Change PendingDeprecationWarning -> DeprecationWarning.
https://hg.python.org/cpython/rev/a0d50aad7b02

New changeset 9550f0d22d27 by Yury Selivanov in branch 'default':
Merge 3.6 (issue #27243)
https://hg.python.org/cpython/rev/9550f0d22d27

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<http://bugs.python.org/issue27243>
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