def failUnlessIdentical(self, first, second, msg=None):
        if first is not second:
            raise self.failureException(msg or '%r is not %r' % (first, second))
        return first
Fail the test if C{first} is not C{second}.  This is an
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/trial/unittest.py/_Assertions.failUnlessIdentical