namespace GiNaC {
-template <> GINAC_IMPLEMENT_REGISTERED_CLASS(exprseq, basic)
+template <> GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(exprseq, basic,
+ print_func<print_context>(&exprseq::do_print).
+ print_func<print_tree>(&exprseq::do_print_tree))
/** Specialization of container::info() for exprseq. */
bool exprseq::info(unsigned inf) const