bug#41212: fail to build python-parso

[srandom]

my guix describe:


Generation 3    May 12 2020 09:03:13    (current)
  guix 91be384
    repository URL: /opt/guix
    branch: master
    commit: 91be384d2ef87af58f814e10a4ce0d8717bea647


(I store the git repository in /opt/guix and pull the source code of upstream 
https://github.com/guix-mirror/guix)


build log:


=================================== FAILURES ===================================
_______________ test_python_exception_matches[(lambda: x := 1)] ________________


code = '(lambda: x := 1)'


    @pytest.mark.parametrize('code', FAILING_EXAMPLES)
    def test_python_exception_matches(code):
        wanted, line_nr = _get_actual_exception(code)


        errors = _get_error_list(code)
        wanted, line_nr = _get_actual_exception(code)                           
                                                                                
[50/1848]


        errors = _get_error_list(code)
        actual = None
        if errors:
            error, = errors
            actual = error.message
>       assert actual in wanted
E       AssertionError: assert 'SyntaxError: cannot use named assignment with 
subscript' in ['SyntaxError: cannot use assignment expressions with subscript']


test/test_python_errors.py:39: AssertionError
__________________ test_python_exception_matches[(a(i) := x)] __________________


code = '(a(i) := x)'


    @pytest.mark.parametrize('code', FAILING_EXAMPLES)
    def test_python_exception_matches(code):
        wanted, line_nr = _get_actual_exception(code)


        errors = _get_error_list(code)
        actual = None
        if errors:
            error, = errors
            actual = error.message
>       assert actual in wanted
E       AssertionError: assert 'SyntaxError: cannot use named assignment with 
function call' in ['SyntaxError: cannot use assignment expressions with 
function call']


test/test_python_errors.py:39: AssertionError
__________________ test_python_exception_matches[(a.b := c)] ___________________


code = '(a.b := c)'


    @pytest.mark.parametrize('code', FAILING_EXAMPLES)
    def test_python_exception_matches(code):
        wanted, line_nr = _get_actual_exception(code)


        errors = _get_error_list(code)
        actual = None
        if errors:
            error, = errors
            actual = error.message
>       assert actual in wanted
E       AssertionError: assert 'SyntaxError: cannot use named assignment with 
attribute' in ['SyntaxError: cannot use assignment expressions with attribute']


test/test_python_errors.py:39: AssertionError
_____ test_python_exception_matches[[(i.i:= 0) for ((i), j) in range(5)]] ______


code = '[(i.i:= 0) for ((i), j) in range(5)]'


    @pytest.mark.parametrize('code', FAILING_EXAMPLES)
    def test_python_exception_matches(code):
        wanted, line_nr = _get_actual_exception(code)
    def test_python_exception_matches(code):                                    
                                                                                
 [0/1848]
        wanted, line_nr = _get_actual_exception(code)


        errors = _get_error_list(code)
        actual = None
        if errors:
            error, = errors
            actual = error.message
>       assert actual in wanted
E       AssertionError: assert 'SyntaxError: cannot use named assignment with 
attribute' in ['SyntaxError: cannot use assignment expressions with attribute']


test/test_python_errors.py:39: AssertionError
________________ test_python_exception_matches[(await a := x)] _________________


code = '(await a := x)'


    @pytest.mark.parametrize('code', FAILING_EXAMPLES)
    def test_python_exception_matches(code):
        wanted, line_nr = _get_actual_exception(code)


        errors = _get_error_list(code)
        actual = None
        if errors:
            error, = errors
            actual = error.message
>       assert actual in wanted
E       AssertionError: assert 'SyntaxError: cannot use named assignment with 
await expression' in ['SyntaxError: cannot use assignment expressions with 
await expression
']


test/test_python_errors.py:39: AssertionError
_______________ test_python_exception_matches[((await a) := x)] ________________


code = '((await a) := x)'


    @pytest.mark.parametrize('code', FAILING_EXAMPLES)
    def test_python_exception_matches(code):
        wanted, line_nr = _get_actual_exception(code)


        errors = _get_error_list(code)
        actual = None
        if errors:
            error, = errors
            actual = error.message
>       assert actual in wanted
E       AssertionError: assert 'SyntaxError: cannot use named assignment with 
await expression' in ['SyntaxError: cannot use assignment expressions with 
await expression
']


test/test_python_errors.py:39: AssertionError
================== 9 failed, 1181 passed, 1 xfailed in 17.76s ==================
command "pytest" "-vv" failed with status 1






How should I solve it?