Class Outer

Lib/test/test_patma.py:2678–2683

            __attr = "eggs"  # mangled to _C__attr
            _Outer__attr = "bacon"
        class Outer:
            def f(self, x):
                match x:
                    # looks up __attr, not _C__attr or _Outer__attr
                    case C(__attr=y):
                        return y
        c = C()
        setattr(c, "__attr", "spam")  # setattr is needed because we're in a class scope
        self.assertEqual(Outer().f(c), "spam")