Directive block - Gen<None> - 16 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:1
        CSharpSymbolType.Transition;[@];
    MetaCode span - Gen<None> - [addTagHelper] - SpanEditHandler;Accepts:None - (1:0,1) - Symbols:1
        CSharpSymbolType.Identifier;[addTagHelper];
    Markup span - Gen<None> - [ ] - SpanEditHandler;Accepts:None - (13:0,13) - Symbols:1
        CSharpSymbolType.WhiteSpace;[ ];
    Code span - Gen<AddTagHelper:{"";;;} [RZ1020(15:0,15 [1] )]> - [""] - SpanEditHandler;Accepts:AnyExceptNewline - (14:0,14) - Symbols:1
        CSharpSymbolType.StringLiteral;[""];
