bpo-42864: Improve error messages regarding unclosed parentheses (GH-24161)

diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 4bb574f..93b61dc 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -1649,10 +1649,10 @@ def test_errors_in_command(self):
 
         self.assertEqual(stdout.splitlines()[1:], [
             '-> pass',
-            '(Pdb) *** SyntaxError: unexpected EOF while parsing',
+            '(Pdb) *** SyntaxError: \'(\' was never closed',
 
             '(Pdb) ENTERING RECURSIVE DEBUGGER',
-            '*** SyntaxError: unexpected EOF while parsing',
+            '*** SyntaxError: \'(\' was never closed',
             'LEAVING RECURSIVE DEBUGGER',
 
             '(Pdb) ENTERING RECURSIVE DEBUGGER',