From bb678ecae3cd1b7f5949da6b6019db18ba809602 Mon Sep 17 00:00:00 2001
From: Victor Milovanov <lost@losttech.software>
Date: Sat, 20 Feb 2021 19:26:46 -0800
Subject: [PATCH] ensure interned strings can not be referenced after
 InternString.Shutdown

---
 src/runtime/intern.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/runtime/intern.cs b/src/runtime/intern.cs
index d8bdf863e..ced1e5e92 100644
--- a/src/runtime/intern.cs
+++ b/src/runtime/intern.cs
@@ -42,9 +42,10 @@ public static void Initialize()
 
         public static void Shutdown()
         {
-            foreach (var ptr in _intern2strings.Keys)
+            foreach (var entry in _intern2strings)
             {
-                Runtime.XDecref(ptr);
+                Runtime.XDecref(entry.Key);
+                typeof(PyIdentifier).GetField(entry.Value).SetValue(null, IntPtr.Zero);
             }
             _string2interns = null;
             _intern2strings = null;