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{-# LANGUAGE GADTs, TypeFamilies #-}
module HardRecordUpdate where
import Data.Kind
type F :: Type -> Type
type family F a where {}
type G :: Type -> Type -> Type -> Type
data family G a b c
data instance G a b Char where
MkG :: { bar :: F a } -> G a Bool Char
g :: F Int -> G Float b Char -> G Int b Char
g i r = r { bar = i }
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