New submission from Felix Yan <felixonm...@archlinux.org>:

I am packaging Python for Arch and the tests suite of Python 3.8.6 pass here 
without this:

```
0:09:06 load avg: 0.87 [205/424] test_lib2to3                                   
                                                                                
                                                                                
                                                                      
test test_lib2to3 crashed -- Traceback (most recent call last):                 
                                                                                
                                                                                
                                                                      
  File "/build/python/src/Python-3.9.0/Lib/test/libregrtest/runtest.py", line 
270, in _runtest_inner                                                          
                                                                                
                                                                        
    refleak = _runtest_inner2(ns, test_name)                                    
                                                                                
                                                                                
                                                                      
  File "/build/python/src/Python-3.9.0/Lib/test/libregrtest/runtest.py", line 
221, in _runtest_inner2                                                         
                                                                                
                                                                        
    the_module = importlib.import_module(abstest)                               
                                                                                
                                                                                
                                                                      
  File "/build/python/src/Python-3.9.0/Lib/importlib/__init__.py", line 127, in 
import_module                                                                   
                                                                                
                                                                      
    return _bootstrap._gcd_import(name[level:], package, level)                 
                                                                                
                                                                                
                                                                      
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import               
                                                                                
                                                                                
                                                                      
  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 680, in _load_unlocked             
                                                                                
                                                                                
                                                                      
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module       
                                                                                
                                                                                
                                                                      
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed  
                                                                                
                                                                                
                                                                      
  File "/build/python/src/Python-3.9.0/Lib/test/test_lib2to3.py", line 5, in 
<module>                                                                        
                                                                                
                                                                         
    from lib2to3.tests import load_tests                                        
                                                                                
                                                                                
                                                                      
  File "/build/python/src/Python-3.9.0/Lib/contextlib.py", line 124, in 
__exit__                                                                        
                                                                                
                                                                              
    next(self.gen)                                                              
                                                                                
                                                                                
                                                                      
  File "/build/python/src/Python-3.9.0/Lib/test/support/__init__.py", line 
1171, in _filterwarnings                                                        
                                                                                
                                                                           
    raise AssertionError("filter (%r, %s) did not catch any warning" %          
                                                                                
                                                                                
                                                                      
AssertionError: filter ('', PendingDeprecationWarning) did not catch any 
warning                                                                         
                                                                                
                                                                             
                                                                                
                                                                                
                                                                                
                                                                      
0:09:06 load avg: 0.87 [206/424/1] test_linecache -- test_lib2to3 failed    
```

----------
components: Tests
messages: 378190
nosy: felixonmars
priority: normal
severity: normal
status: open
title: test_lib2to3 fails since Python 3.9
versions: Python 3.9

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<https://bugs.python.org/issue41970>
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