Fix build failure on 7.8

mgsloan · mgsloan · commit d8a3037d7ff6 · 2016-04-11T19:28:44.000-07:00
diff --git a/src/Stack/Build/Haddock.hs b/src/Stack/Build/Haddock.hs
@@ -90,7 +90,8 @@ openHaddocksInBrowser bco pkgLocations buildTargets = do
                         getDocIndex
             _ -> getDocIndex
     $logInfo ("Opening " <> T.pack (toFilePath docFile) <> " in the browser.")
-    void $ liftIO $ openBrowser (toFilePath docFile)
+    _ <- liftIO $ openBrowser (toFilePath docFile)
+    return ()
 
 -- | Determine whether we should haddock for a package.
 shouldHaddockPackage :: BuildOpts
