[issue1537] Change GeneratorExit's base class from Exception to BaseException

[Christian Heimes]

Christian Heimes added the comment:

Applied in r59300 to the trunk. (This time for real. At first I
committed it together with some junk to py3k branch. :/)

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resolution: accepted -> fixed
status: open -> closed

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<http://bugs.python.org/issue1537>
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