Yaml.one.of: def of yaml-for-bend@0.1.1.0
Import: import yaml-for-bend@0.1.1.0/yaml.bend as Yaml
Lines 48-65 of yaml-for-bend@0.1.1.0/yaml.bend: https://jend.leeeet.dev/read.txt?path=yaml-for-bend@0.1.1.0/yaml.bend&start_line=48&end_line=65

import Base
import yaml-for-bend@0.1.1.0/token.bend as T
import yaml-for-bend@0.1.1.0/value.bend as V
import yaml-for-bend@0.1.1.0/compose.bend as C

def one.of(r: Result<&2, &2, T.Error, List<&2, C.Doc>>) -> Result<&2, &2, T.Error, V.Yaml>:
  match r:
    case Fail{e}:
      Fail{e}
    case Done{ds}:
      match ds:
        case Nil{}:
          Done{V.Null{}}
        case Con{d, rest}:
          match d:
            case C.Doc{v, at}:
              match rest:
                case Nil{}:
                  Done{v}
                case Con{other, more}:
                  match other:
                    case C.Doc{w, second}:
                      Fail{T.Error{"found a second document where load expects one; use load.all", second, T.Content{}}}

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/compose.bend&name=Doc
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/token.bend&name=Cause
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/token.bend&name=Error
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/value.bend&name=Yaml