X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Control%2FCategory.hs;h=b63fc67c92ed3d86a5680134f1471102567eab25;hb=7dbb606d7b57cdad87a0ffbdb6ea4a274ebca7c0;hp=770d8502028a956eb59e4a4bcc18674a5945d4c2;hpb=9fdbf0f92b42f8e64b1f6a4c2c60fe4595852b51;p=ghc-base.git

diff --git a/Control/Category.hs b/Control/Category.hs
index 770d850..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 .
@@ -21,11 +22,11 @@ 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 .
@@ -37,10 +38,10 @@ class Category cat where
  #-}
 
 instance Category (->) where
-        id = Prelude.id
+    id = Prelude.id
 #ifndef __HADDOCK__
 -- Haddock 1.x cannot parse this:
-        (.) = (Prelude..)
+    (.) = (Prelude..)
 #endif
 
 -- | Right-to-left composition