bpo-42725: Render annotations effectless on symbol table with PEP 563 (GH-25583)

Lib/test/test_future.py

@@ -171,6 +171,14 @@ class AnnotationsFutureTestCase(unittest.TestCase):
 
         self.assertEqual(actual, expected)
 
+    def _exec_future(self, code):
+        scope = {}
+        exec(
+            "from __future__ import annotations\n"
+            + code, {}, scope
+        )
+        return scope
+
     def test_annotations(self):
         eq = self.assertAnnotationEqual
         eq('...')
@@ -310,10 +318,6 @@ class AnnotationsFutureTestCase(unittest.TestCase):
         eq("f'{x}'")
         eq("f'{x!r}'")
         eq("f'{x!a}'")
-        eq('(yield from outside_of_generator)')
-        eq('(yield)')
-        eq('(yield a + b)')
-        eq('await some.complicated[0].call(with_args=True or 1 is not 1)')
         eq('[x for x in (a if b else c)]')
         eq('[x for x in a if (b if c else d)]')
         eq('f(x for x in a)')
@@ -321,8 +325,6 @@ class AnnotationsFutureTestCase(unittest.TestCase):
         eq('f((x for x in a), 2)')
         eq('(((a)))', 'a')
         eq('(((a, b)))', '(a, b)')
-        eq("(x := 10)")
-        eq("f'{(x := 10):=10}'")
         eq("1 + 2 + 3")
 
     def test_fstring_debug_annotations(self):
@@ -354,6 +356,53 @@ class AnnotationsFutureTestCase(unittest.TestCase):
                 "object.__debug__: int"
             )
 
+    def test_annotations_symbol_table_pass(self):
+        namespace = self._exec_future(dedent("""
+        from __future__ import annotations
+
+        def foo():
+            outer = 1
+            def bar():
+                inner: outer = 1
+            return bar
+        """))
+
+        foo = namespace.pop("foo")
+        self.assertIsNone(foo().__closure__)
+        self.assertEqual(foo.__code__.co_cellvars, ())
+        self.assertEqual(foo().__code__.co_freevars, ())
+
+    def test_annotations_forbidden(self):
+        with self.assertRaises(SyntaxError):
+            self._exec_future("test: (yield)")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("test.test: (yield a + b)")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("test[something]: (yield from x)")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("def func(test: (yield from outside_of_generator)): pass")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("def test() -> (await y): pass")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("async def test() -> something((a := b)): pass")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("test: await some.complicated[0].call(with_args=True or 1 is not 1)")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future("test: f'{(x := 10):=10}'")
+
+        with self.assertRaises(SyntaxError):
+            self._exec_future(dedent("""\
+            def foo():
+                def bar(arg: (yield)): pass
+            """))
+
 
 if __name__ == "__main__":
     unittest.main()