@sig(H[(Traversable, "t")]/ (H/ "a" >> "b" >> ("a", "c")) >> "a" >> t("t", "b")
        >> ("a", t("t", "c")))
def mapAccumR(f, a, tb):
    raise NotImplementedError()
Removes an element from the context dictionary.
dataset/ETHPy150Open billpmurphy/hask/hask/Data/Traversable.py/mapAccumR--crossover with--dataset/ETHPy150Open thisissoon/Flask-Velox/flask_velox/mixins/context.py/ContextMixin.del_context