///|
fn main {
  let result = @pinyin.convert_text(
    "中国",
    @pinyin.LexiconBuilder::new().build(),
    @pinyin.default_convert_options(),
  ).unwrap()
  let initials = @pinyin.generate_index_key(result, @pinyin.Initials)
  let compact = @pinyin.generate_index_key(result, @pinyin.Compact)
  println("initials=" + initials.key())
  println("compact=" + compact.key())
}