def test_containment(self):
        self.flakes('''
        x = 10
        y = 20
        x in y
        x not in y
        ''')
Implement L{IStreamServerEndpoint.listen} to listen on a TCP socket
dataset/ETHPy150Open kevinw/pyflakes/pyflakes/test/test_other.py/Test.test_containment--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/endpoints.py/_TCPServerEndpoint.listen