node_t
node_t **rootp = (node_t **)vrootp;
node_t *p, *q, *r;
node_t **rootp = (node_t **)vrootp;
node_t *q;
node_t **rootp = (node_t **)vrootp;
q = malloc(sizeof(node_t)); /* T5: key not found */
static void trecurse(const node_t *,
trecurse(const node_t *root, void (*action)(const void *, VISIT, int),