extern void do_namespace_alias (tree, tree);
extern tree do_class_using_decl (tree, tree);
extern void do_using_directive (tree);
-extern cp_expr lookup_arg_dependent (tree, tree, vec<tree, va_gc> *);
+extern tree lookup_arg_dependent (tree, tree, vec<tree, va_gc> *);
extern bool is_associated_namespace (tree, tree);
extern tree innermost_non_namespace_value (tree);
extern cxx_binding *outer_binding (tree, cxx_binding *, bool);