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diff --git a/third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Product.hs b/third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Product.hs
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+{-# LANGUAGE CPP #-}
+#if __GLASGOW_HASKELL__ >= 702
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE EmptyDataDecls #-}
+{-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE Trustworthy #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
+#endif
+#if __GLASGOW_HASKELL__ >= 706
+{-# LANGUAGE PolyKinds #-}
+#endif
+#if __GLASGOW_HASKELL__ >= 708
+{-# LANGUAGE AutoDeriveTypeable #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE KindSignatures #-}
+#endif
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Data.Functor.Product
+-- Copyright   :  (c) Ross Paterson 2010
+-- License     :  BSD-style (see the file LICENSE)
+--
+-- Maintainer  :  R.Paterson@city.ac.uk
+-- Stability   :  experimental
+-- Portability :  portable
+--
+-- Products, lifted to functors.
+-----------------------------------------------------------------------------
+
+module Data.Functor.Product (
+    Product(..),
+  ) where
+
+import Control.Applicative
+import Control.Monad (MonadPlus(..))
+import Control.Monad.Fix (MonadFix(..))
+#if MIN_VERSION_base(4,4,0)
+import Control.Monad.Zip (MonadZip(mzipWith))
+#endif
+#if __GLASGOW_HASKELL__ >= 708
+import Data.Data
+#endif
+import Data.Foldable (Foldable(foldMap))
+import Data.Functor.Classes
+#if MIN_VERSION_base(4,12,0)
+import Data.Functor.Contravariant
+#endif
+import Data.Monoid (mappend)
+import Data.Traversable (Traversable(traverse))
+#if __GLASGOW_HASKELL__ >= 702
+import GHC.Generics
+#endif
+
+-- | Lifted product of functors.
+data Product f g a = Pair (f a) (g a)
+
+#if __GLASGOW_HASKELL__ >= 702
+deriving instance Generic (Product f g a)
+
+instance Generic1 (Product f g) where
+    type Rep1 (Product f g) =
+      D1 MDProduct
+        (C1 MCPair
+          (S1 NoSelector (Rec1 f) :*: S1 NoSelector (Rec1 g)))
+    from1 (Pair f g) = M1 (M1 (M1 (Rec1 f) :*: M1 (Rec1 g)))
+    to1 (M1 (M1 (M1 f :*: M1 g))) = Pair (unRec1 f) (unRec1 g)
+
+data MDProduct
+data MCPair
+
+instance Datatype MDProduct where
+    datatypeName _ = "Product"
+    moduleName   _ = "Data.Functor.Product"
+
+instance Constructor MCPair where
+    conName _ = "Pair"
+#endif
+
+#if __GLASGOW_HASKELL__ >= 708
+deriving instance Typeable Product
+deriving instance (Data (f a), Data (g a), Typeable f, Typeable g, Typeable a)
+               => Data (Product (f :: * -> *) (g :: * -> *) (a :: *))
+#endif
+
+instance (Eq1 f, Eq1 g) => Eq1 (Product f g) where
+    liftEq eq (Pair x1 y1) (Pair x2 y2) = liftEq eq x1 x2 && liftEq eq y1 y2
+
+instance (Ord1 f, Ord1 g) => Ord1 (Product f g) where
+    liftCompare comp (Pair x1 y1) (Pair x2 y2) =
+        liftCompare comp x1 x2 `mappend` liftCompare comp y1 y2
+
+instance (Read1 f, Read1 g) => Read1 (Product f g) where
+    liftReadsPrec rp rl = readsData $
+        readsBinaryWith (liftReadsPrec rp rl) (liftReadsPrec rp rl) "Pair" Pair
+
+instance (Show1 f, Show1 g) => Show1 (Product f g) where
+    liftShowsPrec sp sl d (Pair x y) =
+        showsBinaryWith (liftShowsPrec sp sl) (liftShowsPrec sp sl) "Pair" d x y
+
+instance (Eq1 f, Eq1 g, Eq a) => Eq (Product f g a)
+    where (==) = eq1
+instance (Ord1 f, Ord1 g, Ord a) => Ord (Product f g a) where
+    compare = compare1
+instance (Read1 f, Read1 g, Read a) => Read (Product f g a) where
+    readsPrec = readsPrec1
+instance (Show1 f, Show1 g, Show a) => Show (Product f g a) where
+    showsPrec = showsPrec1
+
+instance (Functor f, Functor g) => Functor (Product f g) where
+    fmap f (Pair x y) = Pair (fmap f x) (fmap f y)
+
+instance (Foldable f, Foldable g) => Foldable (Product f g) where
+    foldMap f (Pair x y) = foldMap f x `mappend` foldMap f y
+
+instance (Traversable f, Traversable g) => Traversable (Product f g) where
+    traverse f (Pair x y) = Pair <$> traverse f x <*> traverse f y
+
+instance (Applicative f, Applicative g) => Applicative (Product f g) where
+    pure x = Pair (pure x) (pure x)
+    Pair f g <*> Pair x y = Pair (f <*> x) (g <*> y)
+
+instance (Alternative f, Alternative g) => Alternative (Product f g) where
+    empty = Pair empty empty
+    Pair x1 y1 <|> Pair x2 y2 = Pair (x1 <|> x2) (y1 <|> y2)
+
+instance (Monad f, Monad g) => Monad (Product f g) where
+#if !(MIN_VERSION_base(4,8,0))
+    return x = Pair (return x) (return x)
+#endif
+    Pair m n >>= f = Pair (m >>= fstP . f) (n >>= sndP . f)
+      where
+        fstP (Pair a _) = a
+        sndP (Pair _ b) = b
+
+instance (MonadPlus f, MonadPlus g) => MonadPlus (Product f g) where
+    mzero = Pair mzero mzero
+    Pair x1 y1 `mplus` Pair x2 y2 = Pair (x1 `mplus` x2) (y1 `mplus` y2)
+
+instance (MonadFix f, MonadFix g) => MonadFix (Product f g) where
+    mfix f = Pair (mfix (fstP . f)) (mfix (sndP . f))
+      where
+        fstP (Pair a _) = a
+        sndP (Pair _ b) = b
+
+#if MIN_VERSION_base(4,4,0)
+instance (MonadZip f, MonadZip g) => MonadZip (Product f g) where
+    mzipWith f (Pair x1 y1) (Pair x2 y2) = Pair (mzipWith f x1 x2) (mzipWith f y1 y2)
+#endif
+
+#if MIN_VERSION_base(4,12,0)
+instance (Contravariant f, Contravariant g) => Contravariant (Product f g) where
+    contramap f (Pair a b) = Pair (contramap f a) (contramap f b)
+#endif