Plan.once.go: def of ezx@1.11.0.0
Import: import ezx@1.11.0.0/src/pub/plan.bend as Plan
Lines 704-710 of ezx@1.11.0.0/src/pub/plan.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.11.0.0/src/pub/plan.bend&start_line=704&end_line=710

import Base
import ezx@1.11.0.0/src/lock/lock.bend as L

# each string of a list once, where it first appears
def once.go(xs: List<&2, String>, +seen: List<&2, String>) -> List<&2, String>:
  match xs:
    case []:
      []
    case +h <> t:
      once.pick(L.seen.holds(seen, h), h, once.go(t, h <> seen))

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/lock.bend&name=seen.holds
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/pub/plan.bend&name=once.pick