Implement -Woperator-whitespace (#18834)wip/warn-operator-whitespace

This patch implements two related warnings:

  -Woperator-whitespace-ext-conflict
      warns on uses of infix operators that would be parsed
      differently were a particular GHC extension enabled

  -Woperator-whitespace
      warns on prefix, suffix, and tight infix uses of infix
      operators

Updates submodules: haddock, containers.

1 files changed, 5 insertions, 5 deletions

diff --git a/ghc/GHCi/UI/Tags.hs b/ghc/GHCi/UI/Tags.hs
index bc86f39766..53c33ccbfe 100644
--- a/ghc/GHCi/UI/Tags.hs
+++ b/ghc/GHCi/UI/Tags.hs
@@ -95,7 +95,7 @@ listModuleTags m = do
        dflags <- getDynFlags
        mb_print_unqual <- GHC.mkPrintUnqualifiedForModule mInfo
        let unqual = fromMaybe GHC.alwaysQualify mb_print_unqual
-       let names = fromMaybe [] $GHC.modInfoTopLevelScope mInfo
+       let names = fromMaybe [] $ GHC.modInfoTopLevelScope mInfo
        let localNames = filter ((m==) . nameModule) names
        mbTyThings <- mapM GHC.lookupName localNames
        return $! [ tagInfo dflags unqual exported kind name realLoc
@@ -153,11 +153,11 @@ collateAndWriteTags CTagsWithLineNumbers file tagInfos = do
 -- ctags style with the Ex expression being a regex searching the line, Vim et al
 collateAndWriteTags CTagsWithRegExes file tagInfos = do -- ctags style, Vim et al
   tagInfoGroups <- makeTagGroupsWithSrcInfo tagInfos
-  let tags = unlines $ sort $ map showCTag $concat tagInfoGroups
+  let tags = unlines $ sort $ map showCTag $ concat tagInfoGroups
   tryIO (writeTagsSafely file tags)
 
 collateAndWriteTags ETags file tagInfos = do -- etags style, Emacs/XEmacs
-  tagInfoGroups <- makeTagGroupsWithSrcInfo $filter tagExported tagInfos
+  tagInfoGroups <- makeTagGroupsWithSrcInfo $ filter tagExported tagInfos
   let tagGroups = map processGroup tagInfoGroups
   tryIO (writeTagsSafely file $ concat tagGroups)
 
@@ -176,7 +176,7 @@ makeTagGroupsWithSrcInfo tagInfos = do
   where
     addTagSrcInfo [] = throwGhcException (CmdLineError "empty tag file group??")
     addTagSrcInfo group@(tagInfo:_) = do
-      file <- readFile $tagFile tagInfo
+      file <- readFile $ tagFile tagInfo
       let sortedGroup = sortBy (comparing tagLine) group
       return $ perFile sortedGroup 1 0 $ lines file
 
@@ -197,7 +197,7 @@ showCTag ti =
   where
     tagCmd =
       case tagSrcInfo ti of
-        Nothing -> show $tagLine ti
+        Nothing -> show $ tagLine ti
         Just (srcLine,_) -> "/^"++ foldr escapeSlashes [] srcLine ++"$/"
 
       where