From 2d037fb406fd8662862c5da40a23033690235f1d Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 8 Jul 2023 05:15:22 -0700
Subject: [PATCH] [3.11] gh-106510: Fix DEBUG output for atomic group
 (GH-106511) (GH-106549)

(cherry picked from commit 74ec02e9490d8aa086aa9ad9d1d34d2ad999b5af)
---
 Lib/re/_parser.py                                            | 4 +++-
 Lib/test/test_re.py                                          | 5 ++++-
 .../Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst   | 1 +
 3 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst

diff --git a/Lib/re/_parser.py b/Lib/re/_parser.py
index f747a0396b1f..6b715f54032f 100644
--- a/Lib/re/_parser.py
+++ b/Lib/re/_parser.py
@@ -114,7 +114,6 @@ class SubPattern:
         self.width = None
 
     def dump(self, level=0):
-        nl = True
         seqtypes = (tuple, list)
         for op, av in self.data:
             print(level*"  " + str(op), end='')
@@ -136,6 +135,9 @@ class SubPattern:
                 if item_no:
                     print(level*"  " + "ELSE")
                     item_no.dump(level+1)
+            elif isinstance(av, SubPattern):
+                print()
+                av.dump(level+1)
             elif isinstance(av, seqtypes):
                 nl = False
                 for a in av:
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index 59d0b7b5c489..167b4400f34c 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -2533,7 +2533,10 @@ ELSE
 
     def test_atomic_group(self):
         self.assertEqual(get_debug_out(r'(?>ab?)'), '''\
-ATOMIC_GROUP [(LITERAL, 97), (MAX_REPEAT, (0, 1, [(LITERAL, 98)]))]
+ATOMIC_GROUP
+  LITERAL 97
+  MAX_REPEAT 0 1
+    LITERAL 98
 
  0. INFO 4 0b0 1 2 (to 5)
  5: ATOMIC_GROUP 11 (to 17)
diff --git a/Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst b/Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst
new file mode 100644
index 000000000000..e0646fa9bc02
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst
@@ -0,0 +1 @@
+Improve debug output for atomic groups in regular expressions.
-- 
2.47.3