Static method of inner class needs this

[rumbu via Digitalmars-d-learn]

class Outer
{
    class Inner
    {
        static Inner createInner()
        {
            return new Inner(); //need 'this' to access member 
this
        }
    }
}
Is this a bug?

If Inner is not nested, it works as expected:

class Inner
{
    static Inner createInner()
    {
        return new Inner()
    }
}

D version: 2.066.1