X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=System%2FEnvironment.hs;h=2b6dec272d6df2a74278c75c80e7463353181a22;hb=41e8fba828acbae1751628af50849f5352b27873;hp=247a905e055980b6a06f330f8fb21e7430142e4c;hpb=8afc9fecd586d3c4f7ef9c69fb1686a79e5f441d;p=ghc-base.git

diff --git a/System/Environment.hs b/System/Environment.hs
index 247a905..2b6dec2 100644
--- a/System/Environment.hs
+++ b/System/Environment.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP, ForeignFunctionInterface #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  System.Environment
@@ -155,7 +157,8 @@ withArgv new_args act = do
   pName <- System.Environment.getProgName
   existing_args <- System.Environment.getArgs
   bracket (setArgs new_args)
-          (\argv -> do setArgs (pName:existing_args); freeArgv argv)
+          (\argv -> do _ <- setArgs (pName:existing_args)
+                       freeArgv argv)
           (const act)
 
 freeArgv :: Ptr CString -> IO ()