re PR c++/49420 ([C++0x] compiler segfault using result_of)

	PR c++/49420
	* error.c (dump_template_argument): Don't try to omit default
	template args from an argument pack.

From-SVN: r175117

gcc/cp/ChangeLog

+2011-06-16  Jason Merrill  <jason@redhat.com>
+
+	PR c++/49420
+	* error.c (dump_template_argument): Don't try to omit default
+	template args from an argument pack.
+
 2011-06-15  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR c++/49412

gcc/cp/error.c

@@ -147,7 +147,9 @@ static void
 dump_template_argument (tree arg, int flags)
 {
   if (ARGUMENT_PACK_P (arg))
-    dump_template_argument_list (ARGUMENT_PACK_ARGS (arg), flags);
+    dump_template_argument_list (ARGUMENT_PACK_ARGS (arg),
+				 /* No default args in argument packs.  */
+				 flags|TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
   else if (TYPE_P (arg) || TREE_CODE (arg) == TEMPLATE_DECL)
     dump_type (arg, flags & ~TFF_CLASS_KEY_OR_ENUM);
   else

gcc/testsuite/ChangeLog

+2011-06-16  Jason Merrill  <jason@redhat.com>
+
+	PR c++/49420
+	* g++.dg/cpp0x/variadic112.C: New.
+
 2011-06-16  Jeff Law <law@redhat.com>
 
 	* gcc.dg/builtin-object-size-1.c: Update to handle chances from

gcc/testsuite/g++.dg/cpp0x/variadic112.C

+// PR c++/49420
+// { dg-options -std=c++0x }
+
+struct A { };
+
+template <class T> struct B
+{
+  typedef typename T::type type ; // { dg-error "no type" }
+};
+
+template <typename Array, typename... Args>
+typename B<Array>::type
+get(const Array& a, Args... args);
+
+int main()
+{
+  A a;
+  int x = get(a, 1, 2, 3);	// { dg-error "no match" }
+}