[project @ 2001-10-23 22:25:46 by sof]

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

diff --git a/ghc/compiler/typecheck/TcMonad.lhs b/ghc/compiler/typecheck/TcMonad.lhs
index f2d7791..41f0890 100644 (file)
--- a/ghc/compiler/typecheck/TcMonad.lhs
+++ b/ghc/compiler/typecheck/TcMonad.lhs
@@ -1,9 +1,7 @@
 \begin{code}
 module TcMonad(
-       TcType, 
-       TcTauType, TcPredType, TcThetaType, TcRhoType,
-       TcTyVar, TcTyVarSet,
-       TcKind,
+       TcType, TcTauType, TcPredType, TcThetaType, TcRhoType,
+       TcTyVar, TcTyVarSet, TcKind,
 
        TcM, NF_TcM, TcDown, TcEnv, 
 
@@ -47,10 +45,9 @@ module TcMonad(
 
 import {-# SOURCE #-} TcEnv  ( TcEnv )
 
-import HsSyn           ( HsOverLit )
+import HsLit           ( HsOverLit )
 import RnHsSyn         ( RenamedPat, RenamedArithSeqInfo, RenamedHsExpr )
-import Type            ( Type, Kind, PredType, ThetaType, RhoType, TauType,
-                       )
+import TcType          ( Type, Kind, PredType, ThetaType, TauType, RhoType )
 import ErrUtils                ( addShortErrLocLine, addShortWarnLocLine, ErrMsg, Message, WarnMsg )
 
 import Bag             ( Bag, emptyBag, isEmptyBag,
@@ -298,7 +295,7 @@ failTc :: TcM a
 failTc down env = give_up
 
 give_up :: IO a
-give_up = IOERROR (userError "Typecheck failed")
+give_up = ioError (userError "Typecheck failed")
 
 failWithTc :: Message -> TcM a                 -- Add an error message and fail
 failWithTc err_msg = failWithTcM (emptyTidyEnv, err_msg)
@@ -394,6 +391,8 @@ tryTc recover main down env
        m_errs_var <- newIORef (emptyBag,emptyBag)
        catch (my_main m_errs_var) (\ _ -> my_recover m_errs_var)
   where
+    errs_var = getTcErrs down
+
     my_recover m_errs_var
       = do warns_and_errs <- readIORef m_errs_var
           recover warns_and_errs down env
@@ -406,7 +405,13 @@ tryTc recover main down env
                -- errors along the way.
            (m_warns, m_errs) <- readIORef m_errs_var
            if isEmptyBag m_errs then
-               return result
+               -- No errors, so return normally, but don't lose the warnings
+               if isEmptyBag m_warns then
+                  return result
+               else
+                  do (warns, errs) <- readIORef errs_var
+                     writeIORef errs_var (warns `unionBags` m_warns, errs)
+                     return result
              else
                give_up         -- This triggers the catch