mark more tests

Lib/test/support/__init__.py

@@ -840,11 +840,27 @@ def python_is_optimized():
     return final_opt not in ('', '-O0', '-Og')
 
 
-_header = 'nP'
+# From CPython 3.13.5
+Py_GIL_DISABLED = bool(sysconfig.get_config_var('Py_GIL_DISABLED'))
+
+# From CPython 3.13.5
+def requires_gil_enabled(msg="needs the GIL enabled"):
+    """Decorator for skipping tests on the free-threaded build."""
+    return unittest.skipIf(Py_GIL_DISABLED, msg)
+
+# From CPython 3.13.5
+def expected_failure_if_gil_disabled():
+    """Expect test failure if the GIL is disabled."""
+    if Py_GIL_DISABLED:
+        return unittest.expectedFailure
+    return lambda test_case: test_case
+
+# From CPython 3.13.5
+if Py_GIL_DISABLED:
+    _header = 'PHBBInP'
+else:
+    _header = 'nP'
 _align = '0n'
-if hasattr(sys, "getobjects"):
-    _header = '2P' + _header
-    _align = '0P'
 _vheader = _header + 'n'
 
 def calcobjsize(fmt):

Lib/test/test_traceback.py

@@ -430,6 +430,8 @@ class TracebackCases(unittest.TestCase):
                     self.assertEqual(len(err), 1)
                 self.assertEqual(err[-1], 'SyntaxError: error\n')
 
+    # TODO: RUSTPYTHON; IndexError: index out of range
+    @unittest.expectedFailure
     @requires_subprocess()
     @force_not_colorized
     def test_encoded_file(self):