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{-# LANGUAGE TypeFamilies #-}
module ShouldFail where
data family C9 a b :: *
data instance C9 Int Int = C9IntInt
data instance C9 [a] Int = C9ListInt
data instance C9 [Int] [a] = C9ListList2
-- must fail: conflicting
data instance C9 [a] [Int] = C9ListList
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