[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S1) ceval.c: GET_AITER: calls _PyCoro_GetAwaitableIter(), which might
  get an exception from calling the user-defined __await__() or checking
  what it returns; such an exception is completely eaten.

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<http://bugs.python.org/issue28885>
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