gh-87822: Make traceback module robust to exceptions from repr() of local values (GH-94691)

1 files changed, 6 insertions, 2 deletions

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index f4161fb..602bd2c 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -2279,6 +2279,9 @@ class TestStack(unittest.TestCase):
             f'  File "{__file__}", line {lno}, in f\n    1/0\n'
         )
 
+class Unrepresentable:
+    def __repr__(self) -> str:
+        raise Exception("Unrepresentable")
 
 class TestTracebackException(unittest.TestCase):
 
@@ -2546,12 +2549,13 @@ class TestTracebackException(unittest.TestCase):
         linecache.updatecache('/foo.py', globals())
         e = Exception("uh oh")
         c = test_code('/foo.py', 'method')
-        f = test_frame(c, globals(), {'something': 1, 'other': 'string'})
+        f = test_frame(c, globals(), {'something': 1, 'other': 'string', 'unrepresentable': Unrepresentable()})
         tb = test_tb(f, 6, None, 0)
         exc = traceback.TracebackException(
             Exception, e, tb, capture_locals=True)
         self.assertEqual(
-            exc.stack[0].locals, {'something': '1', 'other': "'string'"})
+            exc.stack[0].locals,
+            {'something': '1', 'other': "'string'", 'unrepresentable': '<local repr() failed>'})
 
     def test_no_locals(self):
         linecache.updatecache('/foo.py', globals())