def listing.swap
import ezx@1.11.0.0/src/lock/world.bend as Worldimport Base
import ezx@1.11.0.0/src/ledger/upgrade.bend as U
507def listing.swap(+ss: List<&2, U.Swap>, listing: Listing) -> Listing:
508 match listing:
509 case Listed{fs}:
510 Listed{sources.swap(ss, fs)}
511 case Unlisted{why}:
512 Unlisted{why}