X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Prelude.hs;h=ddf3a93f2bbc68e38e6d701f2ae100e7c2c6a5fd;hb=fd14d1940233a4563d14a89fc195587c95750300;hp=9de927d4275699fccb1bdad847fb2772b8848fa6;hpb=06bb288c8d7e2f46276f25c3ef16d091de8f3ded;p=ghc-base.git

diff --git a/Prelude.hs b/Prelude.hs
index 9de927d..ddf3a93 100644
--- a/Prelude.hs
+++ b/Prelude.hs
@@ -179,7 +179,15 @@ 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