RazorDocument - [0..19)::19 - [@addTagHelper "Foo"]
    MarkupBlock - [0..19)::19
        MarkupTextLiteral - [0..0)::0 - [] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Marker;[];
        CSharpCodeBlock - [0..19)::19
            RazorDirective - [0..19)::19
                CSharpTransition - [0..1)::1 - Gen<None> - SpanEditHandler;Accepts:None
                    Transition;[@];
                RazorDirectiveBody - [1..19)::18
                    RazorMetaCode - [1..13)::12 - Gen<None> - SpanEditHandler;Accepts:None
                        Identifier;[addTagHelper];
                    CSharpCodeBlock - [13..19)::6
                        MarkupTextLiteral - [13..14)::1 - [ ] - Gen<None> - SpanEditHandler;Accepts:None
                            Whitespace;[ ];
                        CSharpStatementLiteral - [14..19)::5 - ["Foo"] - Gen<AddTagHelper:{"Foo";Foo;;} [RZ1036(15:0,15 [3] )]> - SpanEditHandler;Accepts:AnyExceptNewline
                            StringLiteral;["Foo"];
        MarkupTextLiteral - [19..19)::0 - [] - Gen<Markup> - SpanEditHandler;Accepts:Any
            Marker;[];
    EndOfFile;[];
