From df0119bb295040d70a1c56ed25ef995345f3e483 Mon Sep 17 00:00:00 2001
From: Kevin Ji <1146876+kevinji@users.noreply.github.com>
Date: Wed, 11 Dec 2024 14:17:25 -0800
Subject: [PATCH] tbtools: Fix typing of `current`

This preps for a typing fix in python/typeshed#13231 where `__cause__` and `__context__` can be None.
---
 src/werkzeug/debug/tbtools.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/werkzeug/debug/tbtools.py b/src/werkzeug/debug/tbtools.py
index d922893ea..69f504599 100644
--- a/src/werkzeug/debug/tbtools.py
+++ b/src/werkzeug/debug/tbtools.py
@@ -238,7 +238,7 @@ def all_tracebacks(
         self,
     ) -> list[tuple[str | None, traceback.TracebackException]]:
         out = []
-        current = self._te
+        current: traceback.TracebackException | None = self._te
 
         while current is not None:
             if current.__cause__ is not None: