def test_containment():
    flakes('''
    x = 10
    y = 20
    x in y
    x not in y
    ''')
Support for the context manager protocol.
dataset/ETHPy150Open timothycrosley/frosted/frosted/test/test_other.py/test_containment--crossover with--dataset/ETHPy150Open twisted/txmongo/txmongo/_gridfs/grid_file.py/GridIn.__exit__