From c34f753a0794a27d9e53f990a482b2ccc10015d0 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Wed, 22 Jun 2022 00:42:04 -0500
Subject: [PATCH] pdict: allow caching key on frozen instances

---
 pytools/persistent_dict.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pytools/persistent_dict.py b/pytools/persistent_dict.py
index db6e3e4..112fe67 100644
--- a/pytools/persistent_dict.py
+++ b/pytools/persistent_dict.py
@@ -256,7 +256,8 @@ class KeyBuilder:
 
         if not isinstance(key, type):
             try:
-                key._pytools_persistent_hash_digest = digest   # noqa pylint:disable=protected-access
+                # pylint:disable=protected-access
+                object.__setattr__(key, "_pytools_persistent_hash_digest",  digest)
             except AttributeError:
                 pass
             except TypeError:
-- 
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