anchor.diff:      return res.copy(value: [new SetextHeader(level, inlines)]);
     });
   
  +
     //
     // Indented code
     //
  
positive.code:     ((blankline.maybe > skipSpaces) > linkTitle).maybe) ^
        (String label, String link, Option<String> title) =>
          new _LinkReference(label, new Target(link, title.isDefined ? title.value : null))) < blankline;
  
    //
    // Paragraph
  
negative.code:     }
      return link;
    };
  
  
    List<String> allowedSchemes = <String>[
      "coap", "doi", "javascript", "aaa", "aaas", "about", "acap", "cap",
  