re PR c++/23586 (Bad diagnostic for invalid namespace-name)

	PR c++/23586
	* parser.c (cp_parser_namespace_name): Move diagnostic for
	invalid namespace-name to here from ...
	* name-lookup.c (do_namespace_alias): ... here and ...
	(do_using_directive): ... here.  Remove dead code.

From-SVN: r103643

gcc/cp/ChangeLog

+2005-08-30  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/23586
+	* parser.c (cp_parser_namespace_name): Move diagnostic for
+	invalid namespace-name to here from ...
+	* name-lookup.c (do_namespace_alias): ... here and ...
+	(do_using_directive): ... here.  Remove dead code.
+
 2005-08-28  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/23099

gcc/cp/name-lookup.c

@@ -3037,12 +3037,10 @@ namespace_ancestor (tree ns1, tree ns2)
 void
 do_namespace_alias (tree alias, tree namespace)
 {
-  if (TREE_CODE (namespace) != NAMESPACE_DECL)
-    {
-      /* The parser did not find it, so it's not there.  */
-      error ("unknown namespace %qD", namespace);
-      return;
-    }
+  if (namespace == error_mark_node)
+    return;
+
+  gcc_assert (TREE_CODE (namespace) == NAMESPACE_DECL);
 
   namespace = ORIGINAL_NAMESPACE (namespace);
 
@@ -3191,26 +3189,15 @@ do_using_directive (tree namespace)
 {
   tree context = NULL_TREE;
 
+  if (namespace == error_mark_node)
+    return;
+
+  gcc_assert (TREE_CODE (namespace) == NAMESPACE_DECL);
+
   if (building_stmt_tree ())
     add_stmt (build_stmt (USING_STMT, namespace));
-
-  /* using namespace A::B::C; */
-  if (TREE_CODE (namespace) == SCOPE_REF)
-      namespace = TREE_OPERAND (namespace, 1);
-  if (TREE_CODE (namespace) == IDENTIFIER_NODE)
-    {
-      /* Lookup in lexer did not find a namespace.  */
-      if (!processing_template_decl)
-	error ("namespace %qT undeclared", namespace);
-      return;
-    }
-  if (TREE_CODE (namespace) != NAMESPACE_DECL)
-    {
-      if (!processing_template_decl)
-	error ("%qT is not a namespace", namespace);
-      return;
-    }
   namespace = ORIGINAL_NAMESPACE (namespace);
+
   if (!toplevel_bindings_p ())
     {
       push_using_directive (namespace);

gcc/cp/parser.c

@@ -10254,6 +10254,8 @@ cp_parser_namespace_name (cp_parser* parser)
   if (namespace_decl == error_mark_node
       || TREE_CODE (namespace_decl) != NAMESPACE_DECL)
     {
+      if (!cp_parser_uncommitted_to_tentative_parse_p (parser))
+	error ("%qD is not a namespace-name", identifier);
       cp_parser_error (parser, "expected namespace-name");
       namespace_decl = error_mark_node;
     }