rb_define_method (cPart, "swallow", c_swallow, 1);
rb_define_method (cPart, "unswallow", c_unswallow, 1);
rb_define_method (cPart, "swallowed_object",
rb_define_method (cPart, "swallow", c_swallow, 1);
rb_define_method (cPart, "unswallow", c_unswallow, 1);
rb_define_method (cPart, "swallowed_object",