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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
-- {-# LANGUAGE UndecidableInstances #-}
module Bug where
type family Undefined :: k where {}
type family LetInterleave xs t ts is (a_ahkO :: [a]) (a_ahkP :: [[a]]) :: [[a]] where
LetInterleave xs t ts is y z = Undefined y z
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