RustPython
diff --git a/.cspell.dict/python-more.txt b/.cspell.dict/python-more.txt
@@ -67,6 +67,7 @@ fnctl
 frombytes
 fromhex
 fromunicode
+frozensets
 fset
 fspath
 fstring

diff --git a/Lib/copyreg.py b/Lib/copyreg.py
@@ -31,8 +31,8 @@ def pickle_complex(c):
 pickle(complex, pickle_complex, complex)
 
 def pickle_union(obj):
-    import functools, operator
-    return functools.reduce, (operator.or_, obj.__args__)
+    import typing, operator
+    return operator.getitem, (typing.Union, obj.__args__)
 
 pickle(type(int | str), pickle_union)
 

diff --git a/Lib/test/test_dataclasses/__init__.py b/Lib/test/test_dataclasses/__init__.py
@@ -2311,6 +2311,7 @@ class C:
 
         self.assertDocStrEqual(C.__doc__, "C(x:int=3)")
 
+    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_docstring_one_field_with_default_none(self):
         @dataclass
         class C:

diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py
@@ -2922,6 +2922,7 @@ def decorated_classmethod(cls, arg: int) -> str:
             'decorated_classmethod'
         )
 
+    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_invalid_registrations(self):
         msg_prefix = "Invalid first argument to `register()`: "
         msg_suffix = (

diff --git a/Lib/test/test_inspect/test_inspect.py b/Lib/test/test_inspect/test_inspect.py
@@ -2028,6 +2028,7 @@ def test_pep_695_generics_with_future_annotations_nested_in_function(self):
 
 
 class TestFormatAnnotation(unittest.TestCase):
+    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_typing_replacement(self):
         from test.typinganndata.ann_module9 import A, ann, ann1
         self.assertEqual(inspect.formatannotation(ann), 'Union[List[str], int]')
@@ -2040,6 +2041,7 @@ def test_typing_replacement(self):
             'Union[List[testModule.typing.A], int]',
         )
 
+    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_formatannotationrelativeto(self):
         from test.typinganndata.ann_module9 import A, ann1
-Original file line number
+Diff line change
@@ Expand Up / @@ -67,6 +67,7 @@ fnctl @@
     frombytes
     fromhex
     fromunicode
+    frozensets
     fset
     fspath
     fstring
@@ Expand Down @@