SimpleFail11b.hs:7:15:
    Conflicting family instance declarations:
      C9 [a] Int = C9ListInt -- Defined at SimpleFail11b.hs:7:15
      C9 [a] Int = C9ListInt2 -- Defined at SimpleFail11b.hs:9:15

SimpleFail11b.hs:13:15:
    Conflicting family instance declarations:
      D9 [a] Int = [a] -- Defined at SimpleFail11b.hs:13:15
      D9 [a] Int = Maybe a -- Defined at SimpleFail11b.hs:15:15