Add instances for basic types of the new generic deriving mechanism.

1 files changed, 27 insertions, 1 deletions

diff --git a/libraries/base/GHC/Int.hs b/libraries/base/GHC/Int.hs
index 05d10c580b..bafa7f040f 100644
--- a/libraries/base/GHC/Int.hs
+++ b/libraries/base/GHC/Int.hs
@@ -1,4 +1,5 @@
-{-# LANGUAGE CPP, NoImplicitPrelude, BangPatterns, MagicHash #-}
+{-# LANGUAGE CPP, NoImplicitPrelude, BangPatterns, MagicHash, 
+             StandaloneDeriving #-}
 {-# OPTIONS_HADDOCK hide #-}
 -----------------------------------------------------------------------------
 -- |
@@ -41,6 +42,8 @@ import GHC.Err
 import GHC.Word hiding (uncheckedShiftL64#, uncheckedShiftRL64#)
 import GHC.Show
 import GHC.Float ()     -- for RealFrac methods
+-- For defining instances for the new generic deriving mechanism
+import GHC.Generics (Arity(..), Associativity(..), Fixity(..))
 
 ------------------------------------------------------------------------
 -- type Int8
@@ -907,3 +910,26 @@ instance Ix Int64 where
     range (m,n)         = [m..n]
     unsafeIndex (m,_) i = fromIntegral i - fromIntegral m
     inRange (m,n) i     = m <= i && i <= n
+
+------------------------------------------------------------------------
+-- Generic deriving
+------------------------------------------------------------------------
+
+-- We need instances for some basic datatypes, but some of those use Int,
+-- so we have to put the instances here
+
+deriving instance Eq Arity
+deriving instance Eq Associativity
+deriving instance Eq Fixity
+
+deriving instance Ord Arity
+deriving instance Ord Associativity
+deriving instance Ord Fixity
+
+deriving instance Read Arity
+deriving instance Read Associativity
+deriving instance Read Fixity
+
+deriving instance Show Arity
+deriving instance Show Associativity
+deriving instance Show Fixity