C++ PATCH for c++/67161 (ICE with template-id)

[Jason Merrill]

When we're dealing with a template-id, all the arguments are 
non-default, so don't try to GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT.

Tested x86_64-pc-linux-gnu, applying to trunk and 5.
commit 15818891060dc29f108ebe5929b1b85250f143a7
Author: Jason Merrill <ja...@redhat.com>
Date:   Wed Aug 12 15:28:20 2015 +0100
    	PR c++/67161
    	* error.c (dump_decl) [TEMPLATE_ID_EXPR]: Pass
    	TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS.

diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index 4f85751..ae3e092 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -1212,7 +1212,8 @@ dump_decl (cxx_pretty_printer *pp, tree t, int flags)
 	if (args == error_mark_node)
 	  pp_string (pp, M_("<template arguments error>"));
 	else if (args)
-	  dump_template_argument_list (pp, args, flags);
+	  dump_template_argument_list
+	    (pp, args, flags|TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
       	pp_cxx_end_template_argument_list (pp);
       }
       break;
diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ44.C b/gcc/testsuite/g++.dg/cpp1y/var-templ44.C
new file mode 100644
index 0000000..2fc21a5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/var-templ44.C
@@ -0,0 +1,29 @@
+// PR c++/67161
+// { dg-do compile { target c++14 } }
+
+template <typename _Tp> struct integral_constant {
+  static constexpr _Tp value = 0;
+};
+template <bool, typename, typename> struct conditional;
+template <typename...> struct __or_;
+template <typename _B1, typename _B2>
+struct __or_<_B1, _B2> : conditional<1, _B1, _B2>::type {};
+template <typename...> struct __and_;
+template <typename> struct __not_ : integral_constant<bool> {};
+template <typename> struct __is_void_helper : integral_constant<bool> {};
+template <typename> struct is_void : __is_void_helper<int> {};
+template <bool, typename _Iftrue, typename> struct conditional {
+  typedef _Iftrue type;
+};
+template <bool _Cond, typename _Iftrue, typename _Iffalse>
+using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
+template <typename...> using common_type_t = int;
+template <typename, int> struct array {};
+template <typename _Tp> constexpr int is_void_v = is_void<_Tp>::value;
+template <typename _Dest = void, typename... _Types>
+constexpr auto make_array()
+    -> array<conditional_t<is_void_v<_Dest>, common_type_t<>, _Dest>,
+             sizeof...(_Types)> {
+  static_assert(__or_<__not_<is_void<_Dest>>, __and_<>>::value, ""); // { dg-error "static assert" }
+}
+auto d = make_array();