C# 9 init properties using "with"

Program.cs

using System;

var glasgowMeetup = new Meetup() {
    City ="Glasgow",
    Topic = ".Net"
};

var edinburghMeetup = glasgowMeetup with { City="Edinburgh" };
glasgowMeetup.Topic = "Umbraco";

Console.WriteLine(glasgowMeetup);
Console.WriteLine(edinburghMeetup);

public record Meetup 
{ 
    public string City { get; init; }
    public string Topic { get; set; }
}