Jim Mussared 5578182ec9 py/objgenerator: Allow pend_throw to an unstarted generator. ...

Replace the is_running field with a tri-state variable to indicate
running/not-running/pending-exception.

Update tests to cover the various cases.

This allows cancellation in uasyncio even if the coroutine hasn't been
executed yet.  Fixes #5242

2019-11-04 15:51:16 +11:00

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