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

[Guido van Rossum]

Guido van Rossum added the comment:

looks good to me. Crys, can you do the honors?

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nosy: +gvanrossum
resolution:  -> accepted

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1537>
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