def bq.get_len
import bend-osdev-algo@0.1.0.0/proof_bsearch.bend as ProofBsearchimport Base
446def bq.get_len(xs: List<&2, U32>) -> {List.get(&2, U32, xs, List.length(&2, U32, xs)) == None{} : Maybe<&2, U32>}:
447 match xs:
448 case Nil{}:
449 {==}
450 case Con{x, t}:
451 bq.get_len(t)