rb_singleton_class_clone_and_attach 367 class.c return rb_singleton_class_clone_and_attach(obj, Qundef); rb_singleton_class_clone_and_attach 887 internal.h VALUE rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach); rb_singleton_class_clone_and_attach 337 object.c singleton = rb_singleton_class_clone_and_attach(obj, clone);