Yury Selivanov added the comment:
Here's a minimal test to reproduce:
import reprlib
def main():
if 0:
yield
raise RuntimeError
m = main()
try:
m.send(None)
except RuntimeError as ex:
ex.__context__ = ex
reprlib.repr(ex)
Looks like it's a bug in reprlib. It's not related to PEP 492/479.
It's also reproducible in Python 3.4 and 3.3.
Nick, ExitStack does this (indirectly) 'ex.__context__ = ex' thing -- I think
that's a bug of contextlib.
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<http://bugs.python.org/issue25779>
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