MigrateIo.wal.exists: def of mylsm-lsm-store@0.6.0.1
Import: import mylsm-lsm-store@0.6.0.1/src/transfer/MigrateIo.bend as MigrateIo
Lines 629-637 of mylsm-lsm-store@0.6.0.1/src/transfer/MigrateIo.bend: https://jend.leeeet.dev/read.txt?path=mylsm-lsm-store@0.6.0.1/src/transfer/MigrateIo.bend&start_line=629&end_line=637

import Base
import mylsm-lsm-store@0.6.0.1/src/DbLock.bend as DbLock

# Requires the legacy WAL path to be readable without changing it.
def wal.exists(
  lock: DbLock.Lock,
  result: Result<&1, &1, U32 & String, Bool>,
  path: String
) -> IO(Result<&1, &1, Error, Nat>):
  match result:
    case Fail{error}: host.failed(lock, error, path)
    case Done{present}: wal.present(lock, present, path)

Uses (11):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=IO
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/DbLock.bend&name=Lock
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/transfer/MigrateIo.bend&name=Error
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/transfer/MigrateIo.bend&name=host.failed
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/transfer/MigrateIo.bend&name=wal.present