[project @ 2005-04-04 12:16:45 by simonpj]

[ghc-base.git] / Prelude.hs

diff --git a/Prelude.hs b/Prelude.hs
index 9de927d..840c2ca 100644 (file)
--- a/Prelude.hs
+++ b/Prelude.hs
@@ -1,4 +1,4 @@
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Prelude
@@ -153,6 +153,8 @@ import Data.Either
 import Data.Maybe
 import Data.Bool
 import Data.Tuple
+import Data.Eq
+import Data.Ord
 #endif
 
 #ifdef __GLASGOW_HASKELL__
@@ -175,11 +177,18 @@ import Hugs.Prelude
 #ifndef __HUGS__
 infixr 0 $!
 
-
 -- -----------------------------------------------------------------------------
 -- Miscellaneous functions
 
+-- | Strict (call-by-value) application, defined in terms of 'seq'.
 ($!)    :: (a -> b) -> a -> b
 f $! x  = x `seq` f x
 #endif
 
+#ifdef __HADDOCK__
+-- | The value of @'seq' a b@ is bottom if @a@ is bottom, and otherwise
+-- equal to @b@.  'seq' is usually introduced to improve performance by
+-- avoiding unneeded laziness.
+seq :: a -> b -> b
+seq _ y = y
+#endif