re PR c++/70067 (internal compiler error: in strip_typedefs, at cp/tree.c:1466)

	PR c++/70067

	* tree.c (strip_typedefs): Handle TYPENAME_TYPE lookup finding the
	same type.

From-SVN: r233973

gcc/cp/ChangeLog

+2016-03-04  Jason Merrill  <jason@redhat.com>
+
+	PR c++/70067
+	* tree.c (strip_typedefs): Handle TYPENAME_TYPE lookup finding the
+	same type.
+
 2016-03-03  Jason Merrill  <jason@redhat.com>
 
 	* method.c (synthesized_method_walk): operator= can also be constexpr.

gcc/cp/tree.c

@@ -1437,6 +1437,9 @@ strip_typedefs (tree t, bool *remove_attributes)
 	result = make_typename_type (strip_typedefs (TYPE_CONTEXT (t),
 						     remove_attributes),
 				     fullname, typename_type, tf_none);
+	/* Handle 'typedef typename A::N N;'  */
+	if (typedef_variant_p (result))
+	  result = TYPE_MAIN_VARIANT (DECL_ORIGINAL_TYPE (TYPE_NAME (result)));
       }
       break;
     case DECLTYPE_TYPE:

gcc/testsuite/g++.dg/template/typename21.C

+// PR c++/70067
+// { dg-do compile { target c++98 } }
+
+template <class> struct A;
+template <class T> struct B { struct N { }; };
+template <class T> struct D: B<T> {
+  typedef typename D::N N;
+  A<N> *a;
+};
+
+D<int> d;