$ ./python -Werror -m test.regrtest -u all -vv
== CPython 3.5.0a4+ (default:5342fad7cd59+, May 16 2015, 15:55:16) [GCC 4.8.2]
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/serhiy/py/cpython/Lib/test/regrtest.py", line 1589, in <module>
    main_in_temp_cwd()
  File "/home/serhiy/py/cpython/Lib/test/regrtest.py", line 1564, in main_in_temp_cwd
    main()
  File "/home/serhiy/py/cpython/Lib/test/regrtest.py", line 602, in main
    print("==  ", platform.platform(aliased=True),
  File "/home/serhiy/py/cpython/Lib/platform.py", line 1441, in platform
    distname, distversion, distid = dist('')
  File "/home/serhiy/py/cpython/Lib/platform.py", line 378, in dist
    PendingDeprecationWarning, stacklevel=2)
PendingDeprecationWarning: dist() and linux_distribution() functions are deprecated in Python 3.5 and will be removed in Python 3.7