It appears that the contextmanager implementation (both in the stdlib and
as described in the PEP) doesn't correctly handle the case where the
generator yields a new value in response to throw(). It responds by
suppressing the original exception, but IIRC earlier versions of the PEP
threw a RuntimeError for this scenario.
Unless there are any objections, I'd like to restore this by replacing the
"return True" that follows the throw(), with:
raise RuntimeError("generator didn't stop after throw()")
and again, update the PEP accordingly.
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