https://github.com/python/cpython/commit/919a3e8028de61a57c672c2de1a47c82b75b2e39
commit: 919a3e8028de61a57c672c2de1a47c82b75b2e39
branch: 3.12
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: iritkatriel <1055913+iritkatr...@users.noreply.github.com>
date: 2024-09-06T10:43:05Z
summary:
[3.12] gh-123048: Fix missing source location in pattern matching code
(GH-123167) (#123170)
gh-123048: Fix missing source location in pattern matching code (GH-123167)
(cherry picked from commit bffed80230f2617de2ee02bd4bdded1024234dab)
Co-authored-by: Irit Katriel <1055913+iritkatr...@users.noreply.github.com>
files:
A Misc/NEWS.d/next/Core and
Builtins/2024-08-20-11-09-16.gh-issue-123048.2TISpv.rst
M Lib/test/test_patma.py
diff --git a/Lib/test/test_patma.py b/Lib/test/test_patma.py
index 3dbd19dfffd318..6fe5360b5f296a 100644
--- a/Lib/test/test_patma.py
+++ b/Lib/test/test_patma.py
@@ -1,6 +1,7 @@
import array
import collections
import dataclasses
+import dis
import enum
import inspect
import sys
@@ -3083,6 +3084,24 @@ class Keys:
self.assertIs(y, None)
self.assertIs(z, None)
+class TestSourceLocations(unittest.TestCase):
+ def test_jump_threading(self):
+ # See gh-123048
+ def f():
+ x = 0
+ v = 1
+ match v:
+ case 1:
+ if x < 0:
+ x = 1
+ case 2:
+ if x < 0:
+ x = 1
+ x += 1
+
+ for inst in dis.get_instructions(f):
+ if inst.opcode in dis.hasjrel or inst.opcode in dis.hasjabs:
+ self.assertIsNotNone(inst.positions.lineno, "jump without
location")
class TestTracing(unittest.TestCase):
diff --git a/Misc/NEWS.d/next/Core and
Builtins/2024-08-20-11-09-16.gh-issue-123048.2TISpv.rst b/Misc/NEWS.d/next/Core
and Builtins/2024-08-20-11-09-16.gh-issue-123048.2TISpv.rst
new file mode 100644
index 00000000000000..f0b756febbc1b8
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and
Builtins/2024-08-20-11-09-16.gh-issue-123048.2TISpv.rst
@@ -0,0 +1,2 @@
+Fix a bug where pattern matching code could emit a :opcode:`JUMP_FORWARD`
+with no source location.
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