def colon.top
import bend-net-json@0.3.0.0/json.bend as Jsonimport Base
278def colon.top(k: String, r: String, stack: List<&2, Open>) -> St:
279 match stack:
280 case Nil{}:
281 SFail{}
282 case Con{OArr{xs}, up}:
283 SFail{}
284 case Con{OObj{m, old}, up}:
285 SValue{r, Con{OObj{m, k}, up}}