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SATySFiでデフォルト引数書くときOptional.fromがべんり

@require: optionして使う

Option.from(デフォルトの値 Optionalな値(SomeやNone))みたいな感じでかんたんに書けてべんり

@require: option
@require: stdja

let-inline ctx \sugoi ?:prefix s =
  let p = Option.from `すごい` prefix in
  read-inline ctx (embed-string (p ^ s))
in

document (|
  author = { Seiei MIYAGI };
  show-title = true;
  show-toc = false;
  title = { Optional.fromべんり }
|) '<
 +p { \sugoi(`べんり`); }
 +p { \sugoi?:(`やばい`)(`べんり`); }
>

実行結果

Screenshot from 2018-10-18 12-01-10.png

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Help us understand the problem. What are the problem?