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