Add some more explanation to the skip channel example in the MVar docs

[ghc-base.git] / System / Timeout.hs

diff --git a/System/Timeout.hs b/System/Timeout.hs
index 431f709..b1c79b3 100644 (file)
--- a/System/Timeout.hs
+++ b/System/Timeout.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP #-}
+
 -------------------------------------------------------------------------------
 -- |
 -- Module      :  System.Timeout