2013-06-07  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53658
	* pt.c (lookup_template_class_1): Consistently use TYPE_MAIN_DECL,
	not TYPE_STUB_DECL, to access the _DECL for a _TYPE.

--- gcc/cp/pt.c
+++ gcc/cp/pt.c
@@ -7561,7 +7561,7 @@ lookup_template_class_1 (tree d1, tree arglist, tree in_decl, tree context,
       if (CLASS_TYPE_P (template_type) && is_dependent_type)
 	/* If the type makes use of template parameters, the
 	   code that generates debugging information will crash.  */
-	DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1;
+	DECL_IGNORED_P (TYPE_MAIN_DECL (t)) = 1;
 
       /* Possibly limit visibility based on template args.  */
       TREE_PUBLIC (type_decl) = 1;
--- /dev/null
+++ gcc/testsuite/g++.dg/cpp0x/alias-decl-36.C
@@ -0,0 +1,6 @@
+// PR c++/53658
+// { dg-do compile { target c++11 } }
+
+struct A;
+template <typename> using Foo = const A;
+template <typename Item> Foo <Item> bar();