id.hs

{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedLabels #-}

import Control.Lens
import Data.Generics.Labels
import GHC.Generics
import Prelude hiding (id)
import qualified Prelude

ı = Prelude.id

data A = A {id :: Int}
  deriving (Generic)

data B = B {id :: Int}
  deriving (Generic)

main = do
  let a = A {id = 1}
  print $ let A {id} = a in ı id
  let b = B {id = 2}
  print $ let B {id} = b & #id %~ negate in id