The following tests fail on Windows in refleak mode. I used
24ca28cc9c9c as a reference point. Build is x64. Summary:

test_concurrent_futures, test_datetime, test_multiprocessing, test_strftime and test_time are leaking.



C:\Users\stefan\hg\master\PCbuild>amd64\python_d.exe -m test -uall -R :: test_multiprocessing              
[1/1] test_multiprocessing                                                                                 
beginning 9 repetitions                                                                                    
123456789                                                                                                  
.........                                                                                                  
test_multiprocessing leaked [3, 3, 3, 3] references, sum=12                                                
Warning -- multiprocessing.process._dangling was modified by test_multiprocessing                          
1 test failed:                                                                                             
    test_multiprocessing                                                                                   
[172456 refs]


C:\Users\stefan\hg\master\PCbuild>amd64\python_d.exe -m test -uall -R :: test_concurrent_futures           
[1/1] test_concurrent_futures                                                                              
beginning 9 repetitions                                                                                    
123456789                                                                                                  
.........                                                                                                  
test_concurrent_futures leaked [1524, 1518, 1524, 1524] references, sum=6090                               
1 test failed:                                                                                             
    test_concurrent_futures                                                                                
[170398 refs]                                                                                              
                     

C:\Users\stefan\hg\master\PCbuild>amd64\python_d.exe -m test -uall -R :: test_datetime                     
[1/1] test_datetime                                                                                        
beginning 9 repetitions                                                                                    
123456789                                                                                                  
.........                                                                                                  
test_datetime leaked [20, 20, 20, 20] references, sum=80                                                   
1 test failed:                                                                                             
    test_datetime                                                                                          
[191763 refs]                                                                                            



C:\Users\stefan\hg\master\PCbuild>amd64\python_d.exe -m test -uall -R :: test_strftime                     
[1/1] test_strftime                                                                                        
beginning 9 repetitions                                                                                    
123456789                                                                                                  
.........                                                                                                  
test_strftime leaked [2761, 2761, 2761, 2761] references, sum=11044                                        
1 test failed:                                                                                             
    test_strftime                                                                                          
[170275 refs]                                                                                          


C:\Users\stefan\hg\master\PCbuild>amd64\python_d.exe -m test -uall -R :: test_time                         
[1/1] test_time                                                                                            
beginning 9 repetitions                                                                                    
123456789                                                                                                  
.........                                                                                                  
test_time leaked [1, 1, 1, 1] references, sum=4                                                            
1 test failed:                                                                                             
    test_time                                                                                              
[144556 refs]