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{-# LANGUAGE TypeFamilies #-}
-- This should fail, I think, because of the loopy equality,
-- but the error message is hopeless
module Simple13 where
type family F a
same :: a -> a -> a
same = undefined
mkf :: a -> [F a]
mkf p = undefined
foo :: a ~ [F a] => a -> a
foo p = same p (mkf p)
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