def pair.fst
import bend-kit-property@0.4.0.0/generate.bend as Generateimport Base
import bend-kit-random@0.1.0.1/random.bend as Rand
163def pair.fst(~A: Type, ~B: Type, ~gb: Rand.Rng -> B & Rand.Rng, ar: A & Rand.Rng) -> (A & B) & Rand.Rng:
164 (a, r) = ar
165 pair.snd(~A, ~B, a, gb(r))