Mark variable as nonlocal

CoolCat467 · CoolCat467 · commit 30db0d8022c6 · 2024-10-28T00:54:01.000-05:00
diff --git a/src/trio/_core/_tests/test_guest_mode.py b/src/trio/_core/_tests/test_guest_mode.py
@@ -457,6 +457,7 @@ def aiotrio_run(
     loop = asyncio.new_event_loop()
 
     async def aio_main() -> T:
+        nonlocal run_sync_soon_not_threadsafe
         trio_done_fut = loop.create_future()
 
         def trio_done_callback(main_outcome: Outcome[object]) -> None:
