tests: Add testcase for yielding from a stopped generator.
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# Yielding from stopped generator is ok and results in None
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def gen():
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return 1
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# This yield is just to make this a generator
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yield
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f = gen()
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def run():
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print((yield from f))
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print((yield from f))
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print((yield from f))
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try:
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next(run())
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except StopIteration:
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print("StopIteration")
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