From c410ebddf49db663a7498fa9eab5353252d70304 Mon Sep 17 00:00:00 2001
From: hauntsaninja <hauntsaninja@gmail.com>
Date: Wed, 8 Jul 2026 23:26:12 -0700
Subject: [PATCH] Narrow for frozendict membership check

---
 mypy/checker.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mypy/checker.py b/mypy/checker.py
index 3a98505cc87e..612d2face5b8 100644
--- a/mypy/checker.py
+++ b/mypy/checker.py
@@ -8892,6 +8892,7 @@ def builtin_item_type(tp: Type) -> Type | None:
             "builtins.list",
             "builtins.tuple",
             "builtins.dict",
+            "builtins.frozendict",
             "builtins.set",
             "builtins.frozenset",
             "_collections_abc.dict_keys",