Scan.low.with: def of yaml-for-bend@0.1.1.0
Import: import yaml-for-bend@0.1.1.0/scan.bend as Scan
Lines 491-501 of yaml-for-bend@0.1.1.0/scan.bend: https://jend.leeeet.dev/read.txt?path=yaml-for-bend@0.1.1.0/scan.bend&start_line=491&end_line=501

import Base
import yaml-for-bend@0.1.1.0/token.bend as T

# A level's low: the one below it, or its own key when that is possible.
def low.with(below: Maybe<&2, T.Mark>, possible: Bool, at: T.Mark) -> Maybe<&2, T.Mark>:
  match below:
    case Some{m}:
      Some{m}
    case None{}:
      match possible:
        case True{}:
          Some{at}
        case False{}:
          None{}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/token.bend&name=Mark