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{-# LANGUAGE FlexibleInstances, GADTs #-}
module T5858 where
class InferOverloaded a where
infer :: a -> String
-- instance (t1 ~ String, t2 ~ String) => InferOverloaded (t1,t2) where
instance (t1 ~ String) => InferOverloaded (t1,t1) where
infer = show . fst
foo = infer ([],[])
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