gh-122546: Relax SyntaxError check when raising errors on the new REPL (#123233)

Author: skirpichev

Lib/code.py

@@ -108,7 +108,7 @@ def showsyntaxerror(self, filename=None, **kwargs):
         """
         try:
             typ, value, tb = sys.exc_info()
-            if filename and typ is SyntaxError:
+            if filename and issubclass(typ, SyntaxError):
                 value.filename = filename
             source = kwargs.pop('source', "")
             self._showtraceback(typ, value, None, source)

Lib/test/test_pyrepl/test_pyrepl.py

@@ -1109,6 +1109,10 @@ def test_correct_filename_in_syntaxerrors(self):
             self.skipTest("pyrepl not available")
         self.assertIn("SyntaxError: invalid syntax", output)
         self.assertIn("<python-input-0>", output)
+        commands = " b\nexit()\n"
+        output, exit_code = self.run_repl(commands, env=env)
+        self.assertIn("IndentationError: unexpected indent", output)
+        self.assertIn("<python-input-0>", output)
 
     @force_not_colorized
     def test_proper_tracebacklimit(self):