Expression block - Gen<Expr> - 22 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
        CSharpTokenType.Transition;[@];
    Code span - Gen<Expr> - [val?.more(false)?.abc] - ImplicitExpressionEditHandler;Accepts:NonWhiteSpace;ImplicitExpression[RTD];K14 - (1:0,1) - Tokens:10
        CSharpTokenType.Identifier;[val];
        CSharpTokenType.QuestionMark;[?];
        CSharpTokenType.Dot;[.];
        CSharpTokenType.Identifier;[more];
        CSharpTokenType.LeftParenthesis;[(];
        CSharpTokenType.Keyword;[false];
        CSharpTokenType.RightParenthesis;[)];
        CSharpTokenType.QuestionMark;[?];
        CSharpTokenType.Dot;[.];
        CSharpTokenType.Identifier;[abc];
