def check

bend-kit-property@0.4.0.0 · property.bend:102

import Base
import bend-kit-random@0.1.0.1/random.bend as Rand

102# Return the first failure and its smallest reachable counterexample.
103def check(~T: Type, ~gen: Rand.Rng -> T & Rand.Rng, ~copy: T -> T & T,
104  ~shrink: T -> List<&1, T>, ~test: T -> T & Bool,
105  +seed: U32, trials: Nat) -> Maybe<&1, Failure<T>>:
106  check.start(~T, ~gen, ~copy, ~shrink, ~test, trials, seed, Rand.seed(seed))