# Pastebin dsc1eKgD
actor Foo
  let _file: File

  be read(from: USize = 0) =>
    _file.seek(from)
    var new_offset = from
    while underamount_to_read do
      let new_read = read_some()
      if found then
        return
      end
      new_offset = new_read.size()
    end

    read(new_offset)