[issue18183] Calling .lower() on certain unicode string raises SystemError

[Roundup Robot]

Roundup Robot added the comment:

New changeset b11507395ce4 by Serhiy Storchaka in branch '3.3':
Add tests for issue #18183.
http://hg.python.org/cpython/rev/b11507395ce4

New changeset 17c9f1627baf by Serhiy Storchaka in branch 'default':
Add tests for issue #18183.
http://hg.python.org/cpython/rev/17c9f1627baf

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<http://bugs.python.org/issue18183>
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