STINNER Victor added the comment:

Workaround, or maybe fix?, for the issue:

diff -r 0af15b8ef3b2 Lib/contextlib.py
--- a/Lib/contextlib.py Thu May 12 10:37:58 2016 +0300
+++ b/Lib/contextlib.py Wed May 25 15:56:50 2016 +0200
@@ -87,6 +87,8 @@ class _GeneratorContextManager(ContextDe
                 # (see PEP 479).
                 if exc.__cause__ is value:
                     return False
+                if exc is value:
+                    return
                 raise
             except:
                 # only re-raise if it's *not* the exception that was

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27122>
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