// WARNING: To display the warnings, simply insert a whitespace in the code.

using System;

public class Program

{

  public static void Main()

  {

    #nullable enable

    string nonNullable1 = null;     // (C)

​

    string? nullable = null;        // (D) OK

    string nonNullable2 = nullable; // (E)

​

    var varLength = nullable.Length;   // (F)

    #nullable disable

  }

}