From 06c176c2da4e3aa27abe6a6343064e3997b5b015 Mon Sep 17 00:00:00 2001
From: richardsheridan <richard.sheridan@gmail.com>
Date: Sat, 21 Oct 2023 12:42:39 -0400
Subject: [PATCH] prevent cyclic garbage creation

---
 trio/_core/_run.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/trio/_core/_run.py b/trio/_core/_run.py
index 9c5bde76b7..64908eea33 100644
--- a/trio/_core/_run.py
+++ b/trio/_core/_run.py
@@ -1087,6 +1087,7 @@ def aborted(raise_cancel: _core.RaiseCancelT) -> Abort:
                 exn = capture(raise_cancel).error
                 if not isinstance(exn, Cancelled):
                     self._add_exc(exn)
+                del exn  # prevent cyclic garbage creation
                 return Abort.FAILED
 
             self._parent_waiting_in_aexit = True