def unique
import bend-kit-camber@0.15.0.1/input.bend as Inputimport Base
import bend-kit-json@0.7.0.0/json.bend as Json
272def unique(fuel: Nat, step: Maybe<&1, Walk>) -> Maybe<&1, Json.Val>:
273 match fuel:
274 case 0n: None{}
275 case 1n+rest:
276 match step:
277 case None{}: None{}
278 case Some{Returned{value, Nil{}}}: Some{value}
279 case Some{state}: unique(rest, unique.step(state))