rb_singleton_class_clone  321 class.c        	RBASIC_SET_CLASS(clone, rb_singleton_class_clone(orig));
rb_singleton_class_clone  385 class.c        	    RBASIC_SET_CLASS(clone, rb_singleton_class_clone(klass));
rb_singleton_class_clone  191 include/ruby/intern.h VALUE rb_singleton_class_clone(VALUE);
rb_singleton_class_clone 2008 include/ruby/ruby.h     rb_obj_setup(clone, rb_singleton_class_clone(obj), RBASIC(obj)->flags);