Inherit from class with inaccessible abstract members and all constructors inaccessible
Well, I have either to call a base constructor (which is not accessible) or an other constructor in the same class.

public abstract class Class1 : System.Globalization.EastAsianLunisolarCalendar {
    private Class1() : this(1) {}
    private Class1(int i) : this() {}
}


So let's call the constructors recursive. Not very useful, but who cares?