def lock.step
import cswap-bend-cli@0.1.0.0/warn.bend as Warnimport Base
78def lock.step(m: Maybe<&2, String>, +slot: String, +ls: LS) -> LS:
79 match m:
80 case None{}:
81 ls
82 case Some{+k}:
83 lock.seen(seen_find(k, ls_seen(ls)), k, slot, ls)