From 5a45846df7bc8cbc683b2b19ba11d20bb7f6fdf1 Mon Sep 17 00:00:00 2001
From: Adi Roiban <adi.roiban@chevah.com>
Date: Tue, 16 Jan 2024 14:42:20 +0100
Subject: [PATCH] Update dis.findlinestarts for Python 3.13

---
 src/twisted/python/deprecate.py | 6 +++++-
 src/twisted/trial/_synctest.py  | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/twisted/python/deprecate.py b/src/twisted/python/deprecate.py
index c85b98d..08d37eb 100644
--- a/src/twisted/python/deprecate.py
+++ b/src/twisted/python/deprecate.py
@@ -606,7 +606,11 @@ def warnAboutFunction(offender, warningString):
         warningString,
         category=DeprecationWarning,
         filename=inspect.getabsfile(offenderModule),
-        lineno=max(lineNumber for _, lineNumber in findlinestarts(offender.__code__)),
+        lineno=max(
+            lineNumber
+            for _, lineNumber in findlinestarts(offender.__code__)
+            if lineNumber is not None
+        ),
         module=offenderModule.__name__,
         registry=offender.__globals__.setdefault("__warningregistry__", {}),
         module_globals=None,
diff --git a/src/twisted/trial/_synctest.py b/src/twisted/trial/_synctest.py
index 2cffc2c..8d8e9b1 100644
--- a/src/twisted/trial/_synctest.py
+++ b/src/twisted/trial/_synctest.py
@@ -1192,6 +1192,7 @@ class SynchronousTestCase(_Assertions):
                     lineNumbers = [
                         lineNumber
                         for _, lineNumber in _findlinestarts(aFunction.__code__)
+                        if lineNumber is not None
                     ]
                     if not (min(lineNumbers) <= aWarning.lineno <= max(lineNumbers)):
                         continue
-- 
2.43.0