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[3.6] bpo-29692: contextlib.contextmanager may incorrectly unchain Ru… - #1105
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…ntimeError (pythonGH-949) contextlib._GeneratorContextManager.__exit__ includes a special case to deal with PEP 479 RuntimeErrors created when `StopIteration` is thrown into the context manager body. Previously this check was too permissive, and undid one level of chaining on *all* RuntimeError instances, not just those that wrapped a StopIteration instance. (cherry picked from commit 00c75e9)
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…ntimeError (GH-949)
contextlib._GeneratorContextManager.exit includes a special case to deal with
PEP 479 RuntimeErrors created when StopIteration is thrown into the context
manager body.
Previously this check was too permissive, and undid one level of chaining on all
RuntimeError instances, not just those that wrapped a StopIteration instance.
(cherry picked from commit 00c75e9)