fix gc.get_referrers() exposing the current coro on 3.14

tests/test_taskgroups.py

@@ -1586,75 +1586,103 @@ async def test_exception_refcycles_direct(self) -> None:
         Note: This test never failed on anyio, but keeping this test to align
         with the tests from cpython.
         """
-        tg = create_task_group()
-        exc = None
 
-        class _Done(Exception):
-            pass
+        async def test() -> object:
+            tg = create_task_group()
+            exc = None
 
-        try:
-            async with tg:
-                raise _Done
-        except ExceptionGroup as e:
-            exc = e
+            class _Done(Exception):
+                pass
+
+            try:
+                async with tg:
+                    raise _Done
+            except ExceptionGroup as e:
+                exc = e
+
+            assert exc is not None
+            try:
+                return exc
+            finally:
+                del exc
 
-        assert exc is not None
-        assert gc.get_referrers(exc) == no_other_refs()
+        assert gc.get_referrers(await test()) == no_other_refs()
 
     async def test_exception_refcycles_errors(self) -> None:
         """Test that TaskGroup deletes self._exceptions, and __aexit__ args"""
-        tg = create_task_group()
-        exc = None
 
-        class _Done(Exception):
-            pass
+        async def test() -> object:
+            tg = create_task_group()
+            exc = None
 
-        try:
-            async with tg:
-                raise _Done
-        except ExceptionGroup as excs:
-            exc = excs.exceptions[0]
+            class _Done(Exception):
+                pass
+
+            try:
+                async with tg:
+                    raise _Done
+            except ExceptionGroup as excs:
+                exc = excs.exceptions[0]
 
-        assert isinstance(exc, _Done)
-        assert gc.get_referrers(exc) == no_other_refs()
+            assert isinstance(exc, _Done)
+            try:
+                return exc
+            finally:
+                del exc
+
+        assert gc.get_referrers(await test()) == no_other_refs()
 
     async def test_exception_refcycles_parent_task(self) -> None:
         """Test that TaskGroup's cancel_scope deletes self._host_task"""
-        tg = create_task_group()
-        exc = None
 
-        class _Done(Exception):
-            pass
+        async def test() -> object:
+            tg = create_task_group()
+            exc = None
 
-        async def coro_fn() -> None:
-            async with tg:
-                raise _Done
+            class _Done(Exception):
+                pass
 
-        try:
-            async with anyio.create_task_group() as tg2:
-                tg2.start_soon(coro_fn)
-        except ExceptionGroup as excs:
-            exc = excs.exceptions[0].exceptions[0]
+            async def coro_fn() -> None:
+                async with tg:
+                    raise _Done
+
+            try:
+                async with anyio.create_task_group() as tg2:
+                    tg2.start_soon(coro_fn)
+            except ExceptionGroup as excs:
+                exc = excs.exceptions[0].exceptions[0]
+
+            assert isinstance(exc, _Done)
+            try:
+                return exc
+            finally:
+                del exc
 
-        assert isinstance(exc, _Done)
-        assert gc.get_referrers(exc) == no_other_refs()
+        assert gc.get_referrers(await test()) == no_other_refs()
 
     async def test_exception_refcycles_propagate_cancellation_error(self) -> None:
         """Test that TaskGroup deletes cancelled_exc"""
-        tg = anyio.create_task_group()
-        exc = None
 
-        with CancelScope() as cs:
-            cs.cancel()
+        async def test() -> object:
+            tg = anyio.create_task_group()
+            exc = None
+
+            with CancelScope() as cs:
+                cs.cancel()
+                try:
+                    async with tg:
+                        await checkpoint()
+                except get_cancelled_exc_class() as e:
+                    exc = e
+                    raise
+
+            assert isinstance(exc, get_cancelled_exc_class())
             try:
-                async with tg:
-                    await checkpoint()
-            except get_cancelled_exc_class() as e:
-                exc = e
-                raise
+                return exc
+            finally:
+                del exc
 
-        assert isinstance(exc, get_cancelled_exc_class())
-        assert gc.get_referrers(exc) == no_other_refs()
+        assert gc.get_referrers(await test()) == no_other_refs()
 
     async def test_exception_refcycles_base_error(self) -> None:
         """
@@ -1664,20 +1692,26 @@ async def test_exception_refcycles_base_error(self) -> None:
         but copied from CPython's asyncio.TaskGroup tests for completion.
         """
 
-        class MyKeyboardInterrupt(KeyboardInterrupt):
-            pass
+        async def test() -> object:
+            class MyKeyboardInterrupt(KeyboardInterrupt):
+                pass
 
-        tg = create_task_group()
-        exc = None
+            tg = create_task_group()
+            exc = None
 
-        try:
-            async with tg:
-                raise MyKeyboardInterrupt
-        except BaseExceptionGroup as excs:
-            exc = excs.exceptions[0]
+            try:
+                async with tg:
+                    raise MyKeyboardInterrupt
+            except BaseExceptionGroup as excs:
+                exc = excs.exceptions[0]
+
+            assert isinstance(exc, MyKeyboardInterrupt)
+            try:
+                return exc
+            finally:
+                del exc
 
-        assert isinstance(exc, MyKeyboardInterrupt)
-        assert gc.get_referrers(exc) == no_other_refs()
+        assert gc.get_referrers(await test()) == no_other_refs()
 
 
 class TestTaskStatusTyping: