Markup block - Gen<None> - 7 - (0:0,0)
    Markup span - Gen<Markup> - [] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:1
        SyntaxKind.Unknown;[];
    Expression block - Gen<Expr> - 7 - (0:0,0)
        Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
            SyntaxKind.Transition;[@];
        Code span - Gen<Expr> - [foo(] - ImplicitExpressionEditHandler;Accepts:Any;ImplicitExpression[RTD];K14 - (1:0,1) - Tokens:2
            SyntaxKind.Identifier;[foo];
            SyntaxKind.LeftParenthesis;[(];
        Comment block - Gen<RazorComment> - 2 - (5:0,5)
            Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (5:0,5) - Tokens:1
                SyntaxKind.RazorCommentTransition;[@];
            MetaCode span - Gen<None> - [*] - SpanEditHandler;Accepts:None - (6:0,6) - Tokens:1
                SyntaxKind.RazorCommentStar;[*];
            Comment span - Gen<None> - [] - SpanEditHandler;Accepts:Any - (7:0,7) - Tokens:1
                SyntaxKind.Unknown;[];
