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{-# LANGUAGE DataKinds #-}
module T13025 where
import T13025a
type MyRec = Rec '[ '("A",Int), '("B",Int), '("C",Int) ]
getC :: MyRec -> Int
getC = getField (Proxy::Proxy '("C",Int))
doubleC :: MyRec -> MyRec
doubleC r = setC (2 * (getC r)) r
where setC = set . (Field :: Int -> Field '("C",Int))
main :: IO ()
main = print (getC (Field 1 :& Field 2 :& Field 3 :& Nil :: MyRec))
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