resolve_bases() and new_class() do not work with type alias of a built-in type · Issue #89827

resolve_bases() and new_class() do not work with type alias of a built-in type · Issue #89827 · python/cpython

resolve_bases() returns incorrect result:

>>> import types
>>> types.resolve_bases((list[int],))
(list[int],)

Expected (list,).

new_class() fails:

>>> types.new_class('L', (list[int],), {})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/serhiy/py/cpython/Lib/types.py", line 77, in new_class
    return meta(name, resolved_bases, ns, **kwds)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: GenericAlias expected 2 arguments, got 3

Both work well with typing.List[int].