From e52f78a2067ff78ef79507add85353e76e819ccb Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Tue, 16 Sep 2025 12:41:48 -0400
Subject: [PATCH] Backport PR #30558: Fix stubtest with mypy 18

---
 tools/stubtest.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/stubtest.py b/tools/stubtest.py
index b79ab2f40dd0..d73d966de19e 100644
--- a/tools/stubtest.py
+++ b/tools/stubtest.py
@@ -108,6 +108,7 @@ def visit_ClassDef(self, node):
         [
             "stubtest",
             "--mypy-config-file=pyproject.toml",
+            "--ignore-disjoint-bases",
             "--allowlist=ci/mypy-stubtest-allowlist.txt",
             f"--allowlist={p}",
             "matplotlib",