bpo-41218: Only mark async code with CO_COROUTINE. (GH-21357)

3.8.3 had a regression where compiling with
ast.PyCF_ALLOW_TOP_LEVEL_AWAIT woudl agressively mark things are
coroutine even if there were not.
(cherry picked from commit bd46174a5a09a54e5ae1077909f923f56a7cf710)

Co-authored-by: Matthias Bussonnier <bussonniermatthias@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 48b0e33..f47689d 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -370,6 +370,25 @@ class BuiltinTest(unittest.TestCase):
                 rv = ns['f']()
                 self.assertEqual(rv, tuple(expected))
 
+    def test_compile_top_level_await_no_coro(self):
+        """Make sure top level non-await codes get the correct coroutine flags.
+        """
+        modes = ('single', 'exec')
+        code_samples = [
+            '''def f():pass\n''',
+            '''[x for x in l]'''
+        ]
+        for mode, code_sample in product(modes, code_samples):
+            source = dedent(code_sample)
+            co = compile(source,
+                            '?',
+                            mode,
+                            flags=ast.PyCF_ALLOW_TOP_LEVEL_AWAIT)
+
+            self.assertNotEqual(co.co_flags & CO_COROUTINE, CO_COROUTINE,
+                                msg=f"source={source} mode={mode}")
+
+
     def test_compile_top_level_await(self):
         """Test whether code some top level await can be compiled.