Example:

    class Test
    {
        int n;

        private class Inner
        {
            double m;
            void f1(double x) { }
            void g1(int k) { }
            void f2(Inner inner) { }
            void g2(Test test) { }
        }
    }

Within the context of Inner, the result of code completion for the four methods is:

    f1(m);
    g1(n);
    f2(this);
    g2(null);

If argument guessing can guess "g1(n)" (which effectively is "g1(Test.this.n)") and "f2(this)" (effectively "f2
(Inner.this)"), it should also be able to guess "g2(Test.this)".