extern bool check_constexpr_ctor_body (tree, tree);
extern tree ensure_literal_type_for_constexpr_object (tree);
extern bool potential_constant_expression (tree);
+extern bool potential_rvalue_constant_expression (tree);
extern bool require_potential_constant_expression (tree);
+extern bool require_potential_rvalue_constant_expression (tree);
extern tree cxx_constant_value (tree);
extern tree maybe_constant_value (tree);
extern tree maybe_constant_init (tree);