X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FGHC.hs;h=1fc360550610223fc43c007f3f68728fc3c1097d;hb=99794f66b568709176dd9fc2248a57a21a165556;hp=a95c36c72f16f908ae8a967bc8aab5bceb626aaa;hpb=fcd7ba21a64c12b6e0f1053892d2698ae7d29f81;p=ghc-hetmet.git

diff --git a/compiler/main/GHC.hs b/compiler/main/GHC.hs
index a95c36c..1fc3605 100644
--- a/compiler/main/GHC.hs
+++ b/compiler/main/GHC.hs
@@ -84,7 +84,8 @@ module GHC (
         resume,
         Resume(resumeStmt, resumeThreadId, resumeBreakInfo, resumeSpan,
                resumeHistory, resumeHistoryIx),
-        History(historyBreakInfo), getHistorySpan, getHistoryModule,
+        History(historyBreakInfo, historyEnclosingDecl), 
+        GHC.getHistorySpan, getHistoryModule,
         getResumeContext,
         abandon, abandonAll,
         InteractiveEval.back,
@@ -538,9 +539,16 @@ load s@(Session ref) how_much
 	-- graph is still retained in the Session.  We can tell which modules
 	-- were successfully loaded by inspecting the Session's HPT.
 	mb_graph <- depanal s [] False
-	case mb_graph of	   
-	   Just mod_graph -> load2 s how_much mod_graph 
+	case mb_graph of
+	   Just mod_graph -> catchingFailure $ load2 s how_much mod_graph
 	   Nothing        -> return Failed
+    where catchingFailure f = f `Exception.catch` \e -> do
+              hsc_env <- readIORef ref
+              -- trac #1565 / test ghci021:
+              -- let bindings may explode if we try to use them after
+              -- failing to reload
+              writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
+              throw e
 
 load2 s@(Session ref) how_much mod_graph = do
         guessOutputFile s
@@ -1974,3 +1982,9 @@ findModule' hsc_env mod_name maybe_pkg =
 					text "is not loaded"))
 	    err -> let msg = cannotFindModule dflags mod_name err in
 		   throwDyn (CmdLineError (showSDoc msg))
+
+#ifdef GHCI
+getHistorySpan :: Session -> History -> IO SrcSpan
+getHistorySpan sess h = withSession sess $ \hsc_env -> 
+                          return$ InteractiveEval.getHistorySpan hsc_env h
+#endif