Issue #27243: Fix __aiter__ protocol
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index d68cc7d..154e3b6 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -1076,7 +1076,7 @@
         class Done(Exception): pass
 
         class AIter:
-            async def __aiter__(self):
+            def __aiter__(self):
                 return self
             async def __anext__(self):
                 raise StopAsyncIteration