From a4874a3227a94148940cd312f026f84eab3540f9 Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Wed, 9 Nov 2022 19:10:59 -0500
Subject: [PATCH] Always set the `parent_exit: trio.Event` on exit

---
 tractor/trionics/_mngrs.py | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tractor/trionics/_mngrs.py b/tractor/trionics/_mngrs.py
index 9a7cf7f..5621f79 100644
--- a/tractor/trionics/_mngrs.py
+++ b/tractor/trionics/_mngrs.py
@@ -133,13 +133,13 @@ async def gather_contexts(
         # deliver control once all managers have started up
         await all_entered.wait()
 
-        # NOTE: order *should* be preserved in the output values
-        # since ``dict``s are now implicitly ordered.
-        yield tuple(unwrapped.values())
-
-        # we don't need a try/finally since cancellation will be triggered
-        # by the surrounding nursery on error.
-        parent_exit.set()
+        try:
+            yield tuple(unwrapped.values())
+        finally:
+            # NOTE: this is ABSOLUTELY REQUIRED to avoid
+            # the following wacky bug:
+            # <tractorbugurlhere>
+            parent_exit.set()
 
 
 # Per actor task caching helpers.