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Add Representable0 instances to Either and Maybe.
[ghc-base.git]
/
Data
/
Either.hs
diff --git
a/Data/Either.hs
b/Data/Either.hs
index
b45609b
..
0c72f97
100644
(file)
--- a/
Data/Either.hs
+++ b/
Data/Either.hs
@@
-1,6
+1,6
@@
{-# LANGUAGE CPP, NoImplicitPrelude #-}
#ifdef __GLASGOW_HASKELL__
{-# LANGUAGE CPP, NoImplicitPrelude #-}
#ifdef __GLASGOW_HASKELL__
-{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+{-# LANGUAGE DeriveDataTypeable, DeriveRepresentable, StandaloneDeriving #-}
#endif
-----------------------------------------------------------------------------
#endif
-----------------------------------------------------------------------------
@@
-34,6
+34,7
@@
import GHC.Read
#endif
import Data.Typeable
#endif
import Data.Typeable
+import GHC.Generics (Representable0)
#ifdef __GLASGOW_HASKELL__
{-
#ifdef __GLASGOW_HASKELL__
{-
@@
-51,7
+52,8
@@
either correct or an error; by convention, the 'Left' constructor is
used to hold an error value and the 'Right' constructor is used to
hold a correct value (mnemonic: \"right\" also means \"correct\").
-}
used to hold an error value and the 'Right' constructor is used to
hold a correct value (mnemonic: \"right\" also means \"correct\").
-}
-data Either a b = Left a | Right b deriving (Eq, Ord, Read, Show)
+data Either a b = Left a | Right b
+ deriving (Eq, Ord, Read, Show, Representable0)
-- | Case analysis for the 'Either' type.
-- If the value is @'Left' a@, apply the first function to @a@;
-- | Case analysis for the 'Either' type.
-- If the value is @'Left' a@, apply the first function to @a@;