GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(relational, basic,
print_func<print_context>(&relational::do_print).
- print_func<print_tree>(&basic::do_print_tree).
+ print_func<print_tree>(&relational::do_print_tree).
print_func<print_python_repr>(&relational::do_print_python_repr))
//////////