@sig(H/ ("a", "b") >> "b")
def snd(tup):
    x, y = tup
    return y
Tests a property value for empty in a manner specific to the
dataset/ETHPy150Open billpmurphy/hask/hask/Data/Tuple.py/snd--crossover with--dataset/ETHPy150Open jahlborn/appengine-rest-server/src/main/python/rest/__init__.py/PropertyHandler.empty