call site 15 for test.raises
c-extension/greenlet/test_greenlet.py - line 62
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   def test_exception():
       seen = []
       g1 = greenlet(fmain)
       g2 = greenlet(fmain)
       g1.switch(seen)
       g2.switch(seen)
       g2.parent = g1
       assert seen == []
->     raises(SomeError, g2.switch)
       assert seen == [SomeError]
       g2.switch()
       assert seen == [SomeError]