"Inline Struct Field Initialization"

public readonly struct User {
	public readonly string Name = "<no name>";
	public readonly int Age = -1;

	public User(string name, int age) {
		Name = name;
		Age = age;
	}
}

// ...

var u = new User();
Console.WriteLine(u.Name + " " + u.Age);


Code snippet taken from "Two Decades of C#: A Reference - C# 10".