text: CSharpCodeBlock - [0..10)::10 - [@val?[more]
      CSharpImplicitExpression - [0..10)::10
          CSharpTransition - [0..1)::1 - Gen<None> - SpanEditHandler;Accepts:None
              Transition;[@];
          CSharpImplicitExpressionBody - [1..10)::9
              CSharpCodeBlock - [1..10)::9
                  CSharpExpressionLiteral - [1..10)::9 - [val?[more] - Gen<Expr> - ImplicitExpressionEditHandler;Accepts:Any;ImplicitExpression[RTD];K14
                      Identifier;[val];
                      QuestionMark;[?];
                      LeftBracket;[[];
                      Identifier;[more];
  