SimpleFail11c.hs:7:15:
    Conflicting family instance declarations:
      C9 [a] Int -- Defined at SimpleFail11c.hs:7:15
      C9 [Int] Int -- Defined at SimpleFail11c.hs:9:15

SimpleFail11c.hs:13:15:
    Conflicting family instance declarations:
      D9 [a] Int -- Defined at SimpleFail11c.hs:13:15
      D9 [Int] Int -- Defined at SimpleFail11c.hs:15:15