[issue12791] Yield" leaks exception being handled as garbage

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[issue12791] Yield" leaks exception being handled as garbage

New submission from Martin Panter : See attached "leaky_generator.py" demo. Python doesn't appear to delete the exception variable if an exception is thrown back into it (via "throw", "close" or by deleting it). The result is a reference cycle that needs garbage collecting. This even happens w