[issue30048] If a task is canceled at the right moment, the cancellation is ignored

[INADA Naoki]

INADA Naoki added the comment:

> In Evgeny's example the 'task' is 'coro1' (not 'coro2'). It has plenty of yield points after being cancelled.

Since coro1 waiting coro2 when cancelling, Task(coro1).cancel() redirect to Task(coro2).cancel().

But I was wrong about "CancelledError is thrown to coro2."
Task(coro2) is cancelled in last step.  CancelledError is not thrown to coro2 actually.
So there is chance to detect it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30048>
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