Directive block - Gen<Directive:{custom;SingleLine;Unrestricted} [RZ1016(8:0,8 [9] )]> - 8 - (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];
    Markup span - Gen<None> - [ ] - SpanEditHandler;Accepts:WhiteSpace - (7:0,7) - Tokens:1
        CSharpTokenType.WhiteSpace;[ ];
