X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=GHC%2FException.lhs;h=fd280041574254fe95d562fe26a81b4682479cad;hb=d869f2fcfac24f46966e444feebad4e227d05c27;hp=073e7a97c9ed60a74615c259a93252fe69f14e2b;hpb=d7019a562d5e862476d55d1c0721fd6c4e793c28;p=haskell-directory.git

diff --git a/GHC/Exception.lhs b/GHC/Exception.lhs
index 073e7a9..fd28004 100644
--- a/GHC/Exception.lhs
+++ b/GHC/Exception.lhs
@@ -111,7 +111,10 @@ unblock (IO io) = IO $ unblockAsyncExceptions# io
 -- >   evaluate x >>= f      ==>  (return $! x) >>= f
 --
 -- /Note:/ the first equation implies that @(evaluate x)@ is /not/ the
--- same as @(return $! x)@.
+-- same as @(return $! x)@.  A correct definition is
+--
+-- >   evaluate x = (return $! x) >>= return
+--
 evaluate :: a -> IO a
 evaluate a = IO $ \s -> case a `seq` () of () -> (# s, a #)
         -- NB. can't write