Thing.cs

using System;

class Program
{
  static void Main() {
    var thing = new Thing();
    if(thing.A && thing == null) {
      Console.WriteLine("thing == null");
    }//if
  }
}

class Thing
{
  public bool A { get; } = true;

  public override bool Equals(object obj) => true;
  public override int GetHashCode() => 13;

  public static bool operator ==(Thing a, Thing b) => true;
  public static bool operator !=(Thing a, Thing b) => false;
}