boot_defclass     548 class.c            rb_cBasicObject = boot_defclass("BasicObject", 0);
boot_defclass     549 class.c            rb_cObject = boot_defclass("Object", rb_cBasicObject);
boot_defclass     554 class.c            rb_cModule = boot_defclass("Module", rb_cObject);
boot_defclass     555 class.c            rb_cClass =  boot_defclass("Class",  rb_cModule);