Slightly improve -ddump-hi-diffs output

[ghc-hetmet.git] / compiler / iface / MkIface.lhs

diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index 0fc3972..0d4d163 100644 (file)
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -257,11 +257,13 @@ mkIface hsc_env maybe_old_iface
        ; let   { entities = typeEnvElts type_env ;
                   decls  = [ tyThingToIfaceDecl entity
                           | entity <- entities,
-                             not (isImplicitTyThing entity
-                                  || isWiredInName (getName entity)) ]
-                        -- Don't put implicit Ids and class tycons in
-                        -- the interface file, Nor wired-in things; the
-                        -- compiler knows about them anyhow
+                            let name = getName entity,
+                             not (isImplicitTyThing entity),
+                               -- No implicit Ids and class tycons in the interface file
+                            not (isWiredInName name),
+                               -- Nor wired-in things; the compiler knows about them anyhow
+                            nameIsLocalOrFrom this_mod name  ]
+                               -- Sigh: see Note [Root-main Id] in TcRnDriver
 
                ; fixities    = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
                ; deprecs     = mkIfaceDeprec src_deprecs
@@ -330,7 +332,6 @@ mkIface hsc_env maybe_old_iface
      deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
      ifFamInstTcName = ifaceTyConName . ifFamInstTyCon
 
-                                             
 -----------------------------
 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
 writeIfaceFile dflags location new_iface
@@ -537,7 +538,7 @@ addVersionInfo ver_fn (Just old_iface@(ModIface {
        where
          occ = ifName new_decl
          why = case lookupOccEnv eq_env occ of
-                   Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
+                   Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:") <> ppr names,
                                              nest 2 (braces (fsep (map ppr (occSetElts 
                                                (occs `intersectOccSet` changed_occs)))))]
                            where occs = mkOccSet (map nameOccName (nameSetToList names))