BUG: python-pip-wheel 26.2.1-1 cause crash in virtual environment setup

[Mika Lindqvist]

$ venv/bin/python3.9 -Im ensurepip --upgrade --default-pip
Traceback (most recent call last):
   File "<string>", line 6, in <module>
   File "/usr/lib/python3.9/runpy.py", line 225, in run_module
     return _run_module_code(code, init_globals, run_name, mod_spec)
   File "/usr/lib/python3.9/runpy.py", line 97, in _run_module_code
     _run_code(code, mod_globals, init_globals,
   File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
     exec(code, run_globals)
   File "/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/__main__.py", 
line 24, in <module>
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/cli/main.py", 
line 47, in main
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/cli/autocompletion.py", 
line 12, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/cli/main_parser.py", 
line 11, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/cli/cmdoptions.py", 
line 28, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/cli/parser.py", 
line 20, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/configuration.py", 
line 28, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/utils/logging.py", 
line 32, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/utils/misc.py", 
line 36, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/locations/__init__.py", 
line 10, in <module>
   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
   File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
   File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
   File "<frozen importlib._bootstrap>", line 627, in 
_load_backward_compatible
   File "<frozen zipimport>", line 259, in load_module
   File 
"/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl/pip/_internal/models/scheme.py", 
line 13, in <module>
TypeError: dataclass() got an unexpected keyword argument 'slots'
Traceback (most recent call last):
   File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
     return _run_code(code, main_globals, None,
   File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
     exec(code, run_globals)
   File "/usr/lib/python3.9/ensurepip/__main__.py", line 5, in <module>
     sys.exit(ensurepip._main())
   File "/usr/lib/python3.9/ensurepip/__init__.py", line 226, in _main
     return _bootstrap(
   File "/usr/lib/python3.9/ensurepip/__init__.py", line 145, in _bootstrap
     return _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
   File "/usr/lib/python3.9/ensurepip/__init__.py", line 57, in _run_pip
     return subprocess.run(cmd, check=True).returncode
   File "/usr/lib/python3.9/subprocess.py", line 528, in run
     raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command 
'['/cygdrive/c/build/git/zlib-ng/build-cygwin/venv/bin/python3.9.exe', 
'-I', '-c', '\nimport runpy\nimport sys\nsys.path = 
[\'/tmp/tmpqu_799id/setuptools-41.2.0-py2.py3-none-any.whl\', 
\'/tmp/tmpqu_799id/pip-26.2.1-py3-none-any.whl\'] + 
sys.path\nsys.argv[1:] = [\'install\', \'--no-cache-dir\', 
\'--no-index\', \'--find-links\', \'/tmp/tmpqu_799id\', \'--upgrade\', 
\'setuptools\', \'pip\']\nrunpy.run_module("pip", run_name="__main__", 
alter_sys=True)\n']' returned non-zero exit status 1.