ranctx
static u64 ranval(ranctx *x) {
static void raninit(ranctx *x, u64 *seed) {
static void performance_shuffle(tree *newtree, unsigned long length, ranctx *prng_state)
static void full_shuffle(tree *newtree, unsigned long length, ranctx *prng_state)
ranctx prng_state;