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diff --git a/compiler/main/ErrUtils.lhs b/compiler/main/ErrUtils.lhs
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+%
+% (c) The AQUA Project, Glasgow University, 1994-1998
+%
+\section[ErrsUtils]{Utilities for error reporting}
+
+\begin{code}
+module ErrUtils (
+ Message, mkLocMessage, printError,
+ Severity(..),
+
+ ErrMsg, WarnMsg,
+ errMsgSpans, errMsgContext, errMsgShortDoc, errMsgExtraInfo,
+ Messages, errorsFound, emptyMessages,
+ mkErrMsg, mkWarnMsg, mkPlainErrMsg, mkLongErrMsg,
+ printErrorsAndWarnings, printBagOfErrors, printBagOfWarnings,
+
+ ghcExit,
+ doIfSet, doIfSet_dyn,
+ dumpIfSet, dumpIfSet_core, dumpIfSet_dyn, dumpIfSet_dyn_or, mkDumpDoc,
+
+ -- * Messages during compilation
+ putMsg,
+ errorMsg,
+ fatalErrorMsg,
+ compilationProgressMsg,
+ showPass,
+ debugTraceMsg,
+ ) where
+
+#include "HsVersions.h"
+
+import Bag ( Bag, bagToList, isEmptyBag, emptyBag )
+import SrcLoc ( SrcSpan )
+import Util ( sortLe, global )
+import Outputable
+import qualified Pretty
+import SrcLoc ( srcSpanStart, noSrcSpan )
+import DynFlags ( DynFlags(..), DynFlag(..), dopt )
+import StaticFlags ( opt_ErrorSpans )
+import System ( ExitCode(..), exitWith )
+import DATA_IOREF
+import IO ( hPutStrLn, stderr )
+import DYNAMIC
+
+
+-- -----------------------------------------------------------------------------
+-- Basic error messages: just render a message with a source location.
+
+type Message = SDoc
+
+data Severity
+ = SevInfo
+ | SevWarning
+ | SevError
+ | SevFatal
+
+mkLocMessage :: SrcSpan -> Message -> Message
+mkLocMessage locn msg
+ | opt_ErrorSpans = hang (ppr locn <> colon) 4 msg
+ | otherwise = hang (ppr (srcSpanStart locn) <> colon) 4 msg
+ -- always print the location, even if it is unhelpful. Error messages
+ -- are supposed to be in a standard format, and one without a location
+ -- would look strange. Better to say explicitly "<no location info>".
+
+printError :: SrcSpan -> Message -> IO ()
+printError span msg = printErrs (mkLocMessage span msg $ defaultErrStyle)
+
+
+-- -----------------------------------------------------------------------------
+-- Collecting up messages for later ordering and printing.
+
+data ErrMsg = ErrMsg {
+ errMsgSpans :: [SrcSpan],
+ errMsgContext :: PrintUnqualified,
+ errMsgShortDoc :: Message,
+ errMsgExtraInfo :: Message
+ }
+ -- The SrcSpan is used for sorting errors into line-number order
+ -- NB Pretty.Doc not SDoc: we deal with the printing style (in ptic
+ -- whether to qualify an External Name) at the error occurrence
+
+-- So we can throw these things as exceptions
+errMsgTc :: TyCon
+errMsgTc = mkTyCon "ErrMsg"
+{-# NOINLINE errMsgTc #-}
+instance Typeable ErrMsg where
+#if __GLASGOW_HASKELL__ < 603
+ typeOf _ = mkAppTy errMsgTc []
+#else
+ typeOf _ = mkTyConApp errMsgTc []
+#endif
+
+type WarnMsg = ErrMsg
+
+-- A short (one-line) error message, with context to tell us whether
+-- to qualify names in the message or not.
+mkErrMsg :: SrcSpan -> PrintUnqualified -> Message -> ErrMsg
+mkErrMsg locn print_unqual msg
+ = ErrMsg [locn] print_unqual msg empty
+
+-- Variant that doesn't care about qualified/unqualified names
+mkPlainErrMsg :: SrcSpan -> Message -> ErrMsg
+mkPlainErrMsg locn msg
+ = ErrMsg [locn] alwaysQualify msg empty
+
+-- A long (multi-line) error message, with context to tell us whether
+-- to qualify names in the message or not.
+mkLongErrMsg :: SrcSpan -> PrintUnqualified -> Message -> Message -> ErrMsg
+mkLongErrMsg locn print_unqual msg extra
+ = ErrMsg [locn] print_unqual msg extra
+
+mkWarnMsg :: SrcSpan -> PrintUnqualified -> Message -> WarnMsg
+mkWarnMsg = mkErrMsg
+
+type Messages = (Bag WarnMsg, Bag ErrMsg)
+
+emptyMessages :: Messages
+emptyMessages = (emptyBag, emptyBag)
+
+errorsFound :: DynFlags -> Messages -> Bool
+-- The dyn-flags are used to see if the user has specified
+-- -Werorr, which says that warnings should be fatal
+errorsFound dflags (warns, errs)
+ | dopt Opt_WarnIsError dflags = not (isEmptyBag errs) || not (isEmptyBag warns)
+ | otherwise = not (isEmptyBag errs)
+
+printErrorsAndWarnings :: DynFlags -> Messages -> IO ()
+printErrorsAndWarnings dflags (warns, errs)
+ | no_errs && no_warns = return ()
+ | no_errs = printBagOfWarnings dflags warns
+ -- Don't print any warnings if there are errors
+ | otherwise = printBagOfErrors dflags errs
+ where
+ no_warns = isEmptyBag warns
+ no_errs = isEmptyBag errs
+
+printBagOfErrors :: DynFlags -> Bag ErrMsg -> IO ()
+printBagOfErrors dflags bag_of_errors
+ = sequence_ [ let style = mkErrStyle unqual
+ in log_action dflags SevError s style (d $$ e)
+ | ErrMsg { errMsgSpans = s:ss,
+ errMsgShortDoc = d,
+ errMsgExtraInfo = e,
+ errMsgContext = unqual } <- sorted_errs ]
+ where
+ bag_ls = bagToList bag_of_errors
+ sorted_errs = sortLe occ'ed_before bag_ls
+
+ occ'ed_before err1 err2 =
+ case compare (head (errMsgSpans err1)) (head (errMsgSpans err2)) of
+ LT -> True
+ EQ -> True
+ GT -> False
+
+printBagOfWarnings :: DynFlags -> Bag ErrMsg -> IO ()
+printBagOfWarnings dflags bag_of_warns
+ = sequence_ [ let style = mkErrStyle unqual
+ in log_action dflags SevWarning s style (d $$ e)
+ | ErrMsg { errMsgSpans = s:ss,
+ errMsgShortDoc = d,
+ errMsgExtraInfo = e,
+ errMsgContext = unqual } <- sorted_errs ]
+ where
+ bag_ls = bagToList bag_of_warns
+ sorted_errs = sortLe occ'ed_before bag_ls
+
+ occ'ed_before err1 err2 =
+ case compare (head (errMsgSpans err1)) (head (errMsgSpans err2)) of
+ LT -> True
+ EQ -> True
+ GT -> False
+\end{code}
+
+\begin{code}
+ghcExit :: DynFlags -> Int -> IO ()
+ghcExit dflags val
+ | val == 0 = exitWith ExitSuccess
+ | otherwise = do errorMsg dflags (text "\nCompilation had errors\n\n")
+ exitWith (ExitFailure val)
+\end{code}
+
+\begin{code}
+doIfSet :: Bool -> IO () -> IO ()
+doIfSet flag action | flag = action
+ | otherwise = return ()
+
+doIfSet_dyn :: DynFlags -> DynFlag -> IO () -> IO()
+doIfSet_dyn dflags flag action | dopt flag dflags = action
+ | otherwise = return ()
+\end{code}
+
+\begin{code}
+dumpIfSet :: Bool -> String -> SDoc -> IO ()
+dumpIfSet flag hdr doc
+ | not flag = return ()
+ | otherwise = printDump (mkDumpDoc hdr doc)
+
+dumpIfSet_core :: DynFlags -> DynFlag -> String -> SDoc -> IO ()
+dumpIfSet_core dflags flag hdr doc
+ | dopt flag dflags
+ || verbosity dflags >= 4
+ || dopt Opt_D_verbose_core2core dflags = printDump (mkDumpDoc hdr doc)
+ | otherwise = return ()
+
+dumpIfSet_dyn :: DynFlags -> DynFlag -> String -> SDoc -> IO ()
+dumpIfSet_dyn dflags flag hdr doc
+ | dopt flag dflags || verbosity dflags >= 4
+ = printDump (mkDumpDoc hdr doc)
+ | otherwise
+ = return ()
+
+dumpIfSet_dyn_or :: DynFlags -> [DynFlag] -> String -> SDoc -> IO ()
+dumpIfSet_dyn_or dflags flags hdr doc
+ | or [dopt flag dflags | flag <- flags]
+ || verbosity dflags >= 4
+ = printDump (mkDumpDoc hdr doc)
+ | otherwise = return ()
+
+mkDumpDoc hdr doc
+ = vcat [text "",
+ line <+> text hdr <+> line,
+ doc,
+ text ""]
+ where
+ line = text (replicate 20 '=')
+
+-- -----------------------------------------------------------------------------
+-- Outputting messages from the compiler
+
+-- We want all messages to go through one place, so that we can
+-- redirect them if necessary. For example, when GHC is used as a
+-- library we might want to catch all messages that GHC tries to
+-- output and do something else with them.
+
+ifVerbose :: DynFlags -> Int -> IO () -> IO ()
+ifVerbose dflags val act
+ | verbosity dflags >= val = act
+ | otherwise = return ()
+
+putMsg :: DynFlags -> Message -> IO ()
+putMsg dflags msg = log_action dflags SevInfo noSrcSpan defaultUserStyle msg
+
+errorMsg :: DynFlags -> Message -> IO ()
+errorMsg dflags msg = log_action dflags SevError noSrcSpan defaultErrStyle msg
+
+fatalErrorMsg :: DynFlags -> Message -> IO ()
+fatalErrorMsg dflags msg = log_action dflags SevFatal noSrcSpan defaultErrStyle msg
+
+compilationProgressMsg :: DynFlags -> String -> IO ()
+compilationProgressMsg dflags msg
+ = ifVerbose dflags 1 (log_action dflags SevInfo noSrcSpan defaultUserStyle (text msg))
+
+showPass :: DynFlags -> String -> IO ()
+showPass dflags what
+ = ifVerbose dflags 2 (log_action dflags SevInfo noSrcSpan defaultUserStyle (text "***" <+> text what <> colon))
+
+debugTraceMsg :: DynFlags -> Int -> Message -> IO ()
+debugTraceMsg dflags val msg
+ = ifVerbose dflags val (log_action dflags SevInfo noSrcSpan defaultDumpStyle msg)
+\end{code}
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