re PR c++/65721 (Internal compiler error segmentation fault)

	PR c++/65721
	* name-lookup.c (do_class_using_decl): Complain about specifying
	the current class even if there are dependent bases.

From-SVN: r222096

gcc/cp/ChangeLog

+2015-04-14  Jason Merrill  <jason@redhat.com>
+
+	PR c++/65721
+	* name-lookup.c (do_class_using_decl): Complain about specifying
+	the current class even if there are dependent bases.
+
 2015-04-14  David Krauss  <david_work@me.com>
 
 	PR c++/59766

gcc/cp/name-lookup.c

@@ -3408,7 +3408,7 @@ do_class_using_decl (tree scope, tree name)
 			   tf_warning_or_error);
       if (b_kind < bk_proper_base)
 	{
-	  if (!bases_dependent_p)
+	  if (!bases_dependent_p || b_kind == bk_same_type)
 	    {
 	      error_not_base_type (scope, current_class_type);
 	      return NULL_TREE;

gcc/testsuite/g++.dg/lookup/using55.C

+// PR c++/65721
+
+template<typename T>
+struct A {
+  typedef T D;
+};
+
+template<typename X>
+class B : public A<X> {
+  using typename B::D;		// { dg-error "not a base" }
+public:
+  D echo(D x) {			// { dg-error "D" }
+    return x;
+  }
+};
+
+int main() {
+  B<int> b;
+}