85     dnode_t *lower, *lowleft, *upparent;  in rotate_left()  local
91     lower->parent = upparent = upper->parent;  in rotate_left()
96     if (upper == upparent->left) {  in rotate_left()
97 	upparent->left = lower;  in rotate_left()
99 	assert (upper == upparent->right);  in rotate_left()
100 	upparent->right = lower;  in rotate_left()
114     dnode_t *lower, *lowright, *upparent;  in rotate_right()  local
120     lower->parent = upparent = upper->parent;  in rotate_right()
122     if (upper == upparent->right) {  in rotate_right()
123 	upparent->right = lower;  in rotate_right()
125 	assert (upper == upparent->left);  in rotate_right()
126 	upparent->left = lower;  in rotate_right()