X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Futils%2FPanic.lhs;h=6ad720f1dbfede2ef6398bf0e723a90de6421c86;hb=2c6f7109e521e906fda9e3ed7c78b85b7bffcea1;hp=89976d3dae179684a01756b688a1933227efa145;hpb=2a373c29480d3e99d30dc3b7d07991c58df6d2de;p=ghc-hetmet.git

diff --git a/ghc/compiler/utils/Panic.lhs b/ghc/compiler/utils/Panic.lhs
index 89976d3..6ad720f 100644
--- a/ghc/compiler/utils/Panic.lhs
+++ b/ghc/compiler/utils/Panic.lhs
@@ -11,17 +11,18 @@ some unnecessary loops in the module dependency graph.
 \begin{code}
 module Panic  
    ( 
-     GhcException(..), ghcError, progName, 
+     GhcException(..), showGhcException, ghcError, progName, 
      pgmError,
+
      panic, panic#, assertPanic, trace,
-     showException, showGhcException, tryMost,
-     installSignalHandlers, 
+     
+     Exception.Exception(..), showException, try, tryJust, tryMost, tryUser,
+     catchJust, ioErrors, throwTo,
 
-     catchJust, tryJust, ioErrors, throwTo,
+     installSignalHandlers, 
    ) where
 
 #include "HsVersions.h"
-#include "../includes/ghcconfig.h"
 
 import Config
 import FastTypes
@@ -53,6 +54,7 @@ import DYNAMIC
 import qualified EXCEPTION as Exception
 import TRACE		( trace )
 import UNSAFE_IO	( unsafePerformIO )
+import IO		( isUserError )
 
 import System
 \end{code}
@@ -144,7 +146,7 @@ panic, pgmError :: String -> a
 panic    x = Exception.throwDyn (Panic x)
 pgmError x = Exception.throwDyn (ProgramError x)
 
--- #-versions because panic can't return an unboxed int, and that's
+--  #-versions because panic can't return an unboxed int, and that's
 -- what TAG_ is with GHC at the moment.  Ugh. (Simon)
 -- No, man -- Too Beautiful! (Will)
 
@@ -163,7 +165,7 @@ assertPanic file line =
 -- files, for example.
 
 tryMost :: IO a -> IO (Either Exception.Exception a)
-tryMost action = do r <- myTry action; filter r
+tryMost action = do r <- try action; filter r
   where
    filter (Left e@(Exception.DynException d))
 	    | Just ghc_ex <- fromDynamic d
@@ -174,17 +176,32 @@ tryMost action = do r <- myTry action; filter r
    filter other 
      = return other
 
-#if __GLASGOW_HASKELL__ <= 408
-myTry = Exception.tryAllIO
-#else
-myTry = Exception.try
+-- | tryUser is like try, but catches only UserErrors.
+-- These are the ones that are thrown by the TcRn monad 
+-- to signal an error in the program being compiled
+tryUser :: IO a -> IO (Either Exception.Exception a)
+tryUser action = tryJust tc_errors action
+  where 
+#if __GLASGOW_HASKELL__ > 504 || __GLASGOW_HASKELL__ < 500
+	tc_errors e@(Exception.IOException ioe) | isUserError ioe = Just e
+#elif __GLASGOW_HASKELL__ == 502
+	tc_errors e@(UserError _) = Just e
+#else 
+	tc_errors e@(Exception.IOException ioe) | isUserError e = Just e
 #endif
+	tc_errors _other = Nothing
 \end{code}	
 
 Compatibility stuff:
 
 \begin{code}
 #if __GLASGOW_HASKELL__ <= 408
+try = Exception.tryAllIO
+#else
+try = Exception.try
+#endif
+
+#if __GLASGOW_HASKELL__ <= 408
 catchJust = Exception.catchIO
 tryJust   = Exception.tryIO
 ioErrors  = Exception.justIoErrors