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[ghc-hetmet.git] / compiler / typecheck / TcRnMonad.lhs

diff --git a/compiler/typecheck/TcRnMonad.lhs b/compiler/typecheck/TcRnMonad.lhs
index c861511..a2474c1 100644 (file)
--- a/compiler/typecheck/TcRnMonad.lhs
+++ b/compiler/typecheck/TcRnMonad.lhs
@@ -148,11 +148,10 @@ initTcPrintErrors -- Used from the interactive loop only
        :: HscEnv
        -> Module 
        -> TcM r
-       -> IO (Maybe r)
+       -> IO (Messages, Maybe r)
 initTcPrintErrors env mod todo = do
   (msgs, res) <- initTc env HsSrcFile False mod todo
-  printErrorsAndWarnings (hsc_dflags env) msgs
-  return res
+  return (msgs, res)
 \end{code}
 
 %************************************************************************
@@ -324,6 +323,10 @@ newSysLocalIds :: FastString -> [TcType] -> TcRnIf gbl lcl [TcId]
 newSysLocalIds fs tys
   = do { us <- newUniqueSupply
        ; return (zipWith (mkSysLocal fs) (uniqsFromSupply us) tys) }
+
+instance MonadUnique (IOEnv (Env gbl lcl)) where
+        getUniqueM = newUnique
+        getUniqueSupplyM = newUniqueSupply
 \end{code}
 
 
@@ -460,9 +463,12 @@ getErrsVar = do { env <- getLclEnv; return (tcl_errs env) }
 setErrsVar :: TcRef Messages -> TcRn a -> TcRn a
 setErrsVar v = updLclEnv (\ env -> env { tcl_errs =  v })
 
-addErr :: Message -> TcRn ()
+addErr :: Message -> TcRn ()   -- Ignores the context stack
 addErr msg = do { loc <- getSrcSpanM ; addErrAt loc msg }
 
+failWith :: Message -> TcRn a
+failWith msg = addErr msg >> failM
+
 addLocErr :: Located e -> (e -> Message) -> TcRn ()
 addLocErr (L loc e) fn = addErrAt loc (fn e)
 
@@ -540,7 +546,7 @@ discardWarnings thing_inside
 #if __GLASGOW_HASKELL__ < 609
 try_m :: TcRn r -> TcRn (Either Exception r)
 #else
-try_m :: TcRn r -> TcRn (Either ErrorCall r)
+try_m :: TcRn r -> TcRn (Either IOException r)
 #endif
 -- Does try_m, with a debug-trace on failure
 try_m thing 
@@ -568,7 +574,7 @@ mapAndRecoverM :: (a -> TcRn b) -> [a] -> TcRn [b]
 -- Drop elements of the input that fail, so the result
 -- list can be shorter than the argument list
 mapAndRecoverM _ []     = return []
-mapAndRecoverM f (x:xs) = do { mb_r <- tryM (f x)
+mapAndRecoverM f (x:xs) = do { mb_r <- try_m (f x)
                             ; rs <- mapAndRecoverM f xs
                             ; return (case mb_r of
                                          Left _  -> rs