re PR c++/63528 (A variadic variable template cannot use the ::value of a variadic trait)

	PR c++/63528
	* pt.c (lookup_template_variable): Call coerce_template_parms.

From-SVN: r216279

gcc/cp/ChangeLog

+2014-10-15  Jason Merrill  <jason@redhat.com>
+
+	PR c++/63528
+	* pt.c (lookup_template_variable): Call coerce_template_parms.
+
 2014-10-15  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* semantics.c (is_instantiation_of_constexpr, literal_type_p,

gcc/cp/pt.c

@@ -7993,6 +7993,10 @@ lookup_template_variable (tree templ, tree arglist)
     type = unknown_type_node;
   else
     type = TREE_TYPE (templ);
+  tsubst_flags_t complain = tf_warning_or_error;
+  tree parms = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (templ));
+  arglist = coerce_template_parms (parms, arglist, templ, complain,
+				   /*req_all*/true, /*use_default*/true);
   return build2 (TEMPLATE_ID_EXPR, type, templ, arglist);
 }
 

gcc/testsuite/g++.dg/cpp1y/var-templ14.C

+// PR c++/63528
+// { dg-do compile { target c++14 } }
+
+template<class...>
+struct X
+{
+  constexpr static bool value = true;
+};
+
+static_assert(X<int>::value, "");
+
+template <class... Args>
+constexpr bool X_v = X<Args...>::value;
+
+static_assert(X_v<int>, "");