X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Control%2FCategory.hs;h=b63fc67c92ed3d86a5680134f1471102567eab25;hb=41e8fba828acbae1751628af50849f5352b27873;hp=c85ebd5bb8c665564ea4d63415031bda0b72d304;hpb=ee60f7f31db8897f2b078c964fe715813faee702;p=ghc-base.git

diff --git a/Control/Category.hs b/Control/Category.hs
index c85ebd5..b63fc67 100644
--- a/Control/Category.hs
+++ b/Control/Category.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Control.Category
@@ -12,7 +14,6 @@
 
 module Control.Category where
 
-import Prelude hiding (id,(.))
 import qualified Prelude
 
 infixr 9 .
@@ -21,26 +22,26 @@ infixr 1 >>>, <<<
 -- | A class for categories.
 --   id and (.) must form a monoid.
 class Category cat where
-	-- | the identity morphism
-	id :: cat a a
+    -- | the identity morphism
+    id :: cat a a
 
-	-- | morphism composition
-	(.) :: cat b c -> cat a b -> cat a c
+    -- | morphism composition
+    (.) :: cat b c -> cat a b -> cat a c
 
 {-# RULES
-"identity/left"	forall p .
-		id . p = p
-"identity/right"	forall p .
-		p . id = p
-"association"	forall p q r .
-		(p . q) . r = p . (q . r)
+"identity/left" forall p .
+                id . p = p
+"identity/right"        forall p .
+                p . id = p
+"association"   forall p q r .
+                (p . q) . r = p . (q . r)
  #-}
 
 instance Category (->) where
-	id = Prelude.id
+    id = Prelude.id
 #ifndef __HADDOCK__
 -- Haddock 1.x cannot parse this:
-	(.) = (Prelude..)
+    (.) = (Prelude..)
 #endif
 
 -- | Right-to-left composition