rb_class_foreach_subclass  135 class.c            rb_class_foreach_subclass(klass, class_detach_subclasses, Qnil);
rb_class_foreach_subclass  147 class.c            rb_class_foreach_subclass(klass, class_detach_module_subclasses, Qnil);
rb_class_foreach_subclass  877 internal.h     void rb_class_foreach_subclass(VALUE klass, void (*f)(VALUE, VALUE), VALUE);
rb_class_foreach_subclass   80 vm_method.c        rb_class_foreach_subclass(klass, rb_class_clear_method_cache, arg);
rb_class_foreach_subclass  483 vm_method.c        rb_class_foreach_subclass(klass, check_override_opt_method, (VALUE)mid);