rb_left
iter = &parent->rb_left; \
node = node->rb_left;
new = &((*new)->rb_left);
node = node->rb_left;
node = node->rb_left;
link = &(*link)->rb_left;
node = node->rb_left;
link = &(*link)->rb_left;
new = &parent->rb_left;
tmp = tmp->rb_left;
link = &(*link)->rb_left;
link = &(*link)->rb_left;
node = node->rb_left;
node = node->rb_left;
link = &(*link)->rb_left;
link = &(*link)->rb_left;
node = node->rb_left;
node = node->rb_left;
link = &(*link)->rb_left;
link = &(*link)->rb_left;
link = &(*link)->rb_left;
link = &(*link)->rb_left;
node = node->rb_left;
link = &(*link)->rb_left;
link = &(*link)->rb_left;
p = &(*p)->rb_left;
p = p->rb_left;
n = n->rb_left;
n = &pn->rb_left;
n = n->rb_left;
n = &pn->rb_left;