Expression block - Gen<Expr> - 46 - (0:0,0)
    MetaCode span - Gen<None> - [(] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
        CSharpTokenType.LeftParenthesis;[(];
    Code span - Gen<Expr> - [Request["description"] ?? @photo.Description] - SpanEditHandler;Accepts:Any - (1:0,1) - Tokens:11
        CSharpTokenType.Identifier;[Request];
        CSharpTokenType.LeftBracket;[[];
        CSharpTokenType.StringLiteral;["description"];
        CSharpTokenType.RightBracket;[]];
        CSharpTokenType.WhiteSpace;[ ];
        CSharpTokenType.NullCoalesce;[??];
        CSharpTokenType.WhiteSpace;[ ];
        CSharpTokenType.Transition;[@];
        CSharpTokenType.Identifier;[photo];
        CSharpTokenType.Dot;[.];
        CSharpTokenType.Identifier;[Description];
    MetaCode span - Gen<None> - [)] - SpanEditHandler;Accepts:None - (45:0,45) - Tokens:1
        CSharpTokenType.RightParenthesis;[)];
