def maybe

bend-kit-property@0.4.0.0 · generate.bend:139

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

139# None one time in four, else Some from gen.
140def maybe(~T: Data, ~gen: Rand.Rng -> T & Rand.Rng, r: Rand.Rng) -> Maybe<&2, T> & Rand.Rng:
141  maybe.pick(~T, ~gen, Rand.below(4, r))