rb_next
rb = rb_next(rb); \
return (name##_iter_from(rb_next(&node->field), start, last)); \
for (p = rb_first(root); p; p = rb_next(p)) {
nd = rb_next(nd);
for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p))
for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) {
p = rb_next(p);
for (node = rb_first(&port->table); node; node = rb_next(node)) {
n = rb_next(n);
n = rb_next(n);