Пятничный C# квиз:

Foo foo = new Foo();
Bar bar = new Bar();
Baz baz = new Baz();

Console.WriteLine($"{foo.a}, {bar.a}, {baz.a}");


record struct  Foo(int a = 10);
struct Bar
{
    public Bar(int a = 10)
    {
        this.a = a;
    }

    public int a { get; }
}
record class Baz(int a = 10);