Immutable objects and constructor ?

[chmike via Digitalmars-d-learn]

The error message is gone, but I now have another compilation 
error message I don't understand.

This is what I have in fact

interface Info { . . . }

class MyInfos {
    . . .
protected:
    class Obj : Info
    {
        . . .
    }

public:
    static immutable Obj one = new immutable Obj(...);
    static immutable Obj two = new immutable Obj(...);
}

I get a compiler error in the two assignments to the static Obj 
member variables:
'this' is only defined in non-static member functions, not MyInfos

Is it related to the fact that the Obj class is encapsulated ?


My goal is to be able to write things like this:

void main() {
    Info x1 = MyInfos.one, x2 = MyInfo.two, x3;
    assert(x3 is null);
    x3 = x1;
    assert(x3 is x1);
    assert(x3 is MyInfo.one);

    // Use static immutable instance references as case arg in 
switch
    switch(x1) {
    case MyInfo.one: ...;
    }
}