numeric_arg      2251 complex.c          rb_define_method(rb_cNumeric, "arg", numeric_arg, 0);
numeric_arg      2252 complex.c          rb_define_method(rb_cNumeric, "angle", numeric_arg, 0);
numeric_arg      2253 complex.c          rb_define_method(rb_cNumeric, "phase", numeric_arg, 0);