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

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