repr(CIMultiDictProxy(CIMultiDict())) clears current exception

[zware]

Reproducer:

from aiohttp.multidict import CIMultiDictProxy, CIMultiDict
import sys

try:
    raise Exception
except Exception:
    print(sys.exc_info())
    repr(CIMultiDictProxy(CIMultiDict()))
    print(sys.exc_info())

Results:

(<class 'Exception'>, Exception(), <traceback object at 0x101a3d048>)
(None, None, None)

This is fairly serious; if you stick an 'as e' at the end of 'except Exception' and a 'raise' at the end of the except block, you wind up with a segfault.

Discovered in version 0.14.4, confirmed in 0.16.3.

[asvetlov]

Thanks for report!
It's Cython side effect.
Working on it.

[asvetlov]

Fixed in 0.16.4 release

[asvetlov]

Reported to Cython development list.

[zware]

Thanks for the quick response! I suspected it might be a Cython issue, but I'm completely unfamiliar with Cython.

[asvetlov]

@zware sure!

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