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## while building python3.7 from source code on debian9.8 stretch.
hardware : intel corei5 3337U
4 Gib -- physical ram//4 Gib -- swap space
following the instructions given in the README.rst file:
user@host $ ./configure --enable-optimizations
#---works fine : no issues
user@host $ make 
#---works fine : noissues
user@host $ make test
produces this 
FAIL: test_locale_flag (test.test_re.ReTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/home/apoos-maximus/packages/Python-3.7.2/Lib/test/test_re.py", line 1540, in test_locale_flag
 self.assertTrue(pat.match(bletter))
AssertionError: None is not true
----------------------------------------------------------------------
Ran 123 tests in 1.048s
FAILED (failures=1, skipped=2)
test test_re failed
1 test failed again:
 test_re
== Tests result: FAILURE then FAILURE ==
384 tests OK.
1 test failed:
 test_re
29 tests skipped:
 test_bz2 test_ctypes test_curses test_dbm_gnu test_dbm_ndbm
 test_devpoll test_gdb test_gzip test_idle test_kqueue test_lzma
 test_msilib test_ossaudiodev test_readline test_smtpnet
 test_sqlite test_ssl test_startfile test_tcl test_tix test_tk
 test_ttk_guionly test_ttk_textonly test_turtle test_winconsoleio
 test_winreg test_winsound test_zipfile64 test_zlib
1 re-run test:
 test_re
2 tests run no tests:
 test_dtrace test_future4
Total duration: 4 min 44 sec
Tests result: FAILURE then FAILURE
Makefile:1074: recipe for target 'test' failed
make: *** [test] Error 2
#on rerunning the same test 
user@host $ make test TESTOPTS="-v test_re"
FAIL: test_locale_flag (test.test_re.ReTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/home/apoos-maximus/packages/Python-3.7.2/Lib/test/test_re.py", line 1540, in test_locale_flag
 self.assertTrue(pat.match(bletter))
AssertionError: None is not true
----------------------------------------------------------------------
Ran 123 tests in 0.750s
FAILED (failures=1, skipped=2)
test test_re failed
1 test failed again:
 test_re
== Tests result: FAILURE then FAILURE ==
1 test failed:
 test_re
1 re-run test:
 test_re
Total duration: 1 sec 646 ms
Tests result: FAILURE then FAILURE
Makefile:1074: recipe for target 'test' failed
make: *** [test] Error 2
###### this is how the bug could be reproduced 
PS: do have a look at the traceback ::it makes no sense to me, it might to you !