[3.13] gh-132385: Fix instance error suggestions trigger potential exceptions in traceback (GH-132387) (#133297)

gh-132385: Fix instance error suggestions trigger potential exceptions in `traceback` (GH-132387)
(cherry picked from commit 641253cfac)

Co-authored-by: sobolevn <mail@sobolevn.me>

Lib/test/test_traceback.py

@@ -4549,6 +4549,28 @@ class SuggestionFormattingTestBase:
         actual = self.get_suggestion(instance.foo)
         self.assertNotIn("self.blech", actual)
 
+    def test_unbound_local_error_with_side_effect(self):
+        # gh-132385
+        class A:
+            def __getattr__(self, key):
+                if key == 'foo':
+                    raise AttributeError('foo')
+                if key == 'spam':
+                    raise ValueError('spam')
+
+            def bar(self):
+                foo
+            def baz(self):
+                spam
+
+        suggestion = self.get_suggestion(A().bar)
+        self.assertNotIn('self.', suggestion)
+        self.assertIn("'foo'", suggestion)
+
+        suggestion = self.get_suggestion(A().baz)
+        self.assertNotIn('self.', suggestion)
+        self.assertIn("'spam'", suggestion)
+
     def test_unbound_local_error_does_not_match(self):
         def func():
             something = 3