bpo-34939: Allow annotated global names in module namespace (GH-9844)

Allow annotated global names in the module namespace after the symbol is
declared as global. Previously, only symbols annotated before they are declared
as global (i.e. inside a function) were allowed. This change allows symbols to be
declared as global before the annotation happens in the global scope.

1 files changed, 14 insertions, 0 deletions

diff --git a/Lib/test/test_symtable.py b/Lib/test/test_symtable.py
index 2cd735bdc50..8d76f6fe45f 100644
--- a/Lib/test/test_symtable.py
+++ b/Lib/test/test_symtable.py
@@ -144,6 +144,20 @@ class SymtableTest(unittest.TestCase):
         self.assertTrue(st4.lookup('x').is_local())
         self.assertFalse(st4.lookup('x').is_annotated())
 
+        # Test that annotations in the global scope are valid after the
+        # variable is declared as nonlocal.
+        st5 = symtable.symtable('global x\nx: int', 'test', 'exec')
+        self.assertTrue(st5.lookup("x").is_global())
+
+        # Test that annotations for nonlocals are valid after the
+        # variable is declared as nonlocal.
+        st6 = symtable.symtable('def g():\n'
+                                '    x = 2\n'
+                                '    def f():\n'
+                                '        nonlocal x\n'
+                                '    x: int',
+                                'test', 'exec')
+
     def test_imported(self):
         self.assertTrue(self.top.lookup("sys").is_imported())