readFile.pony

  fun box readFile(auth: AmbientAuth, fname: String): (Array[U8] | FileErrNo) =>
    let caps = recover val FileCaps.>set(FileRead).>set(FileStat) end

    try
      let path = FilePath(auth, fname, caps)

      match OpenFile(path) 
      | let file: File => 
          let result = file.read(1024)
          file.dispose()
          result
      | let err: FileErrNo => err
      else
        FileError // will never happen
      end
    else
      FilePermissionDenied // also unreachable, since FilePath(AmbientAuth, ...) will never raise error
    end