Directive block - Gen<Directive:{custom;SingleLine;Unrestricted}> - 23 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
        CSharpTokenType.Transition;[@];
    MetaCode span - Gen<None> - [custom] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:1
        CSharpTokenType.Identifier;[custom];
    Code span - Gen<None> - [ ] - SpanEditHandler;Accepts:WhiteSpace - (7:0,7) - Tokens:1
        CSharpTokenType.WhiteSpace;[ ];
    Code span - Gen<DirectiveToken {;Type;Opt:False}> - [(bool, int?)] - DirectiveTokenEditHandler;Accepts:NonWhiteSpace - (8:0,8) - Tokens:7
        CSharpTokenType.LeftParenthesis;[(];
        CSharpTokenType.Keyword;[bool];
        CSharpTokenType.Comma;[,];
        CSharpTokenType.WhiteSpace;[ ];
        CSharpTokenType.Keyword;[int];
        CSharpTokenType.QuestionMark;[?];
        CSharpTokenType.RightParenthesis;[)];
    None span - Gen<None> - [   ] - SpanEditHandler;Accepts:WhiteSpace - (20:0,20) - Tokens:1
        CSharpTokenType.WhiteSpace;[   ];
