Improve location info when typechecking interface fiels

diff --git a/compiler/typecheck/TcRnMonad.lhs b/compiler/typecheck/TcRnMonad.lhs
index a795339..ee3c6c6 100644 (file)
--- a/compiler/typecheck/TcRnMonad.lhs
+++ b/compiler/typecheck/TcRnMonad.lhs
@@ -1016,8 +1016,10 @@ forkM_maybe :: SDoc -> IfL a -> IfL (Maybe a)
 forkM_maybe doc thing_inside
  = do {        unsafeInterleaveM $
        do { traceIf (text "Starting fork {" <+> doc)
-          ; mb_res <- tryM thing_inside ;
-            case mb_res of
+          ; mb_res <- tryM $
+                      updLclEnv (\env -> env { if_loc = if_loc env $$ doc }) $ 
+                      thing_inside
+          ; case mb_res of
                Right r  -> do  { traceIf (text "} ending fork" <+> doc)
                                ; return (Just r) }
                Left exn -> do {