[issue21715] Chaining exceptions at C level

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9af21752ea2a by Serhiy Storchaka in branch '3.4':
Issue #21715: Extracted shared complicated code in the _io module to new
https://hg.python.org/cpython/rev/9af21752ea2a

New changeset 8b1ac1a3d007 by Serhiy Storchaka in branch 'default':
Issue #21715: Extracted shared complicated code in the _io module to new
https://hg.python.org/cpython/rev/8b1ac1a3d007

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nosy: +python-dev

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<http://bugs.python.org/issue21715>
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