From c76da79b37d2bcbe575cc927ba0a9b7a9ce465db Mon Sep 17 00:00:00 2001
From: Mark Shannon <mark@hotpy.org>
Date: Thu, 29 Apr 2021 13:12:51 +0100
Subject: bpo-42739: Don't use sentinels to mark end of line table. (GH-25657)

* Add length parameter to PyLineTable_InitAddressRange and doen't use sentinel values at end of table. Makes the line number table more robust.

* Update PyCodeAddressRange to match PEP 626.
---
 Lib/test/test_code.py | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Lib/test/test_code.py')

diff --git a/Lib/test/test_code.py b/Lib/test/test_code.py
index 467e8e5e33..6aaf04ca6d 100644
--- a/Lib/test/test_code.py
+++ b/Lib/test/test_code.py
@@ -264,6 +264,12 @@ class CodeTest(unittest.TestCase):
                 new_code = code.replace(**{attr: value})
                 self.assertEqual(getattr(new_code, attr), value)
 
+    def test_empty_linetable(self):
+        def func():
+            pass
+        new_code = code = func.__code__.replace(co_linetable=b'')
+        self.assertEqual(list(new_code.co_lines()), [])
+
 
 def isinterned(s):
     return s is sys.intern(('_' + s + '_')[1:-1])
-- 
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