def tool.back
import ezx@1.11.0.0/src/ws/up.bend as Upimport Base
import ezx@1.11.0.0/src/ledger/manifest.bend as M
86# a tool of a ledger, after the upgrade
87def tool.back(+own: M.Tool, +ts: List<&2, M.Tool>) -> M.Tool:
88 tool.back.at(own, M.tool.find(ts, M.tool.name(own)))