Up.checkout: def of ezx@1.11.0.0
Import: import ezx@1.11.0.0/src/lock/up.bend as Up
Lines 351-353 of ezx@1.11.0.0/src/lock/up.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.11.0.0/src/lock/up.bend&start_line=351&end_line=353

import Base

# the same, looked up among the answers
def checkout(rs: List<&2, Reply>, +ask: Ask) -> Co:
  checkout.heard(heard(rs, ask), ask)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/up.bend&name=Ask
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/up.bend&name=Co
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/up.bend&name=Reply
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/up.bend&name=checkout.heard
  https://jend.leeeet.dev/definition.txt?path=ezx@1.11.0.0/src/lock/up.bend&name=heard