@sig(H/ (H/ "a" >> t(Maybe, "b")) >> ["a"] >> ["b"])
def mapMaybe(f, la):
    return L[(fromJust(b) for b in (f(a) for a in la) if isJust(b))]
Test an error response is generated from a stanza.
dataset/ETHPy150Open billpmurphy/hask/hask/Data/Maybe.py/mapMaybe--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/words/test/test_jabbererror.py/StanzaErrorTest.test_toResponse