Directive block - Gen<Directive:{custom;SingleLine;Unrestricted} [RZ1016(8:0,8 [1] )]> - 8 - (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];
    Markup span - Gen<None> - [ ] - SpanEditHandler;Accepts:Whitespace - (7:0,7) - Tokens:1
        SyntaxKind.Whitespace;[ ];
