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            def f():
                x = 1
                def g():
                    global x
                    def i():
                        def h():
                            return x
                        return h()
                    return i()
                return g()
            self.assertEqual(f(), 7)
            self.assertEqual(x, 7)

            # II
            x = 7
            def f():
                x = 1
                def g():
                    x = 2
                    def i():
                        def h():
                            return x
                        return h()
                    return i()
                return g()
            self.assertEqual(f(), 2)
            self.assertEqual(x, 7)

            # III
            x = 7
            def f():
                x = 1
                def g():
                    global x
                    x = 2
                    def i():
                        def h():
                            return x
                        return h()
                    return i()
                return g()
            self.assertEqual(f(), 2)
            self.assertEqual(x, 2)

            # IV
            x = 7
            def f():
                x = 3
                def g():
                    global x
                    x = 2
                    def i():
                        def h():
                            return x
                        return h()
                    return i()
                return g()
            self.assertEqual(f(), 2)
            self.assertEqual(x, 2)

            # XXX what about global statements in class blocks?
            # do they affect methods?

            x = 12
            class Global:
                global x
                x = 13
                def set(self, val):
                    x = val
                def get(self):
                    return x

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            self.assertEqual(g.get(), 13)
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                return Foo()

            x = 0
            self.assertEqual(test(6)(2), 8)
            x = -1
            self.assertEqual(test(3)(2), 5)

            looked_up_by_load_name = False
            class X:
                # Implicit globals inside classes are be looked up by LOAD_NAME, not
                # LOAD_GLOBAL.
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