Handle an empty AST body when reporting tracebacks

- Fixes: rhbz#2311907

00439-gh-122145-handle-an-empty-ast-body-when-reporting-tracebacks.patch

@@ -0,0 +1,83 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
+ <10796600+picnixz@users.noreply.github.com>
+Date: Wed, 18 Sep 2024 18:42:33 +0200
+Subject: [PATCH] 00439: gh-122145: Handle an empty AST body when reporting
+ tracebacks
+
+(cherry picked from commit 5cd50cb6eb28e525f0c838e049e900ea982a5a23)
+---
+ Lib/test/test_traceback.py                    | 35 +++++++++++++++++++
+ Lib/traceback.py                              |  2 ++
+ ...-07-23-12-38-14.gh-issue-122145.sTO8nX.rst |  3 ++
+ 3 files changed, 40 insertions(+)
+ create mode 100644 Misc/NEWS.d/next/Library/2024-07-23-12-38-14.gh-issue-122145.sTO8nX.rst
+
+diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
+index 574d5dab97..a78aded4cc 100644
+--- a/Lib/test/test_traceback.py
++++ b/Lib/test/test_traceback.py
+@@ -3304,6 +3304,41 @@ def format_frame_summary(self, frame_summary, colorize=False):
+             f'  File "{__file__}", line {lno}, in f\n    1/0\n'
+         )
+ 
++    def test_summary_should_show_carets(self):
++        # See: https://github.com/python/cpython/issues/122353
++
++        # statement to execute and to get a ZeroDivisionError for a traceback
++        statement = "abcdef = 1 / 0 and 2.0"
++        colno = statement.index('1 / 0')
++        end_colno = colno + len('1 / 0')
++
++        # Actual line to use when rendering the traceback
++        # and whose AST will be extracted (it will be empty).
++        cached_line = '# this line will be used during rendering'
++        self.addCleanup(unlink, TESTFN)
++        with open(TESTFN, "w") as file:
++            file.write(cached_line)
++        linecache.updatecache(TESTFN, {})
++
++        try:
++            exec(compile(statement, TESTFN, "exec"))
++        except ZeroDivisionError as exc:
++            # This is the simplest way to create a StackSummary
++            # whose FrameSummary items have their column offsets.
++            s = traceback.TracebackException.from_exception(exc).stack
++            self.assertIsInstance(s, traceback.StackSummary)
++            with unittest.mock.patch.object(s, '_should_show_carets',
++                                            wraps=s._should_show_carets) as ff:
++                self.assertEqual(len(s), 2)
++                self.assertListEqual(
++                    s.format_frame_summary(s[1]).splitlines(),
++                    [
++                        f'  File "{TESTFN}", line 1, in <module>',
++                        f'    {cached_line}'
++                     ]
++                )
++                ff.assert_called_with(colno, end_colno, [cached_line], None)
++
+ class Unrepresentable:
+     def __repr__(self) -> str:
+         raise Exception("Unrepresentable")
+diff --git a/Lib/traceback.py b/Lib/traceback.py
+index 3e708c6f86..0fe7187a0c 100644
+--- a/Lib/traceback.py
++++ b/Lib/traceback.py
+@@ -698,6 +698,8 @@ def _should_show_carets(self, start_offset, end_offset, all_lines, anchors):
+         with suppress(SyntaxError, ImportError):
+             import ast
+             tree = ast.parse('\n'.join(all_lines))
++            if not tree.body:
++                return False
+             statement = tree.body[0]
+             value = None
+             def _spawns_full_line(value):
+diff --git a/Misc/NEWS.d/next/Library/2024-07-23-12-38-14.gh-issue-122145.sTO8nX.rst b/Misc/NEWS.d/next/Library/2024-07-23-12-38-14.gh-issue-122145.sTO8nX.rst
+new file mode 100644
+index 0000000000..a4282f12d9
+--- /dev/null
++++ b/Misc/NEWS.d/next/Library/2024-07-23-12-38-14.gh-issue-122145.sTO8nX.rst
+@@ -0,0 +1,3 @@
++Fix an issue when reporting tracebacks corresponding to Python code
++emitting an empty AST body.
++Patch by Nikita Sobolev and Bénédikt Tran.

python3.13.spec

@@ -17,7 +17,7 @@ URL: https://www.python.org/
 %global prerel rc2
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: Python-2.0.1
 
 
@@ -390,6 +390,10 @@ Source11: idle3.appdata.xml
 # pypa/distutils integration: https://github.com/pypa/distutils/pull/70
 Patch251: 00251-change-user-install-location.patch
 
+# 00439 # 5c3ace49fc6242246c8e54f2f904d483fb51aefa
+# gh-122145: Handle an empty AST body when reporting tracebacks
+Patch439: 00439-gh-122145-handle-an-empty-ast-body-when-reporting-tracebacks.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -1731,6 +1735,10 @@ CheckPython freethreading
 # ======================================================
 
 %changelog
+* Wed Sep 18 2024 Miro Hrončok <mhroncok@redhat.com> - 3.13.0~rc2-2
+- Handle an empty AST body when reporting tracebacks
+- Fixes: rhbz#2311907
+
 * Sat Sep 07 2024 Karolina Surma <ksurma@redhat.com> - 3.13.0~rc2-1
 - Update to Python 3.13.0rc2