Struct Rng 

pub struct Rng(/* private fields */);

xorshift64*. Seeded per run so probe payloads differ every time — a provider cannot pre-cache answers to canaries it has not seen.

Implementations

impl Rng

pub fn new() -> Self

pub fn from_seed(seed: u64) -> Self

Deterministic construction.

A run must be unpredictable to the endpoint being probed — a provider that can guess the payloads can pre-cache the answers — but that is a property of who chooses the seed, not of whether one exists. The CLI leaves it to Rng::new; an embedder that probes on someone else’s behalf picks the seed itself, keeps it, and can then replay the exact run when a verdict is challenged. Tests use it for the obvious reason.

pub fn next_u64(&mut self) -> u64

pub fn range(&mut self, lo: i64, hi: i64) -> i64

Uniform in [lo, hi]. Returns lo when the range is empty or inverted.

pub fn hex(&mut self, len: usize) -> String

Uppercase hex token, used for canary markers.

Trait Implementations

impl Default for Rng

fn default() -> Self

Returns the “default value” for a type.