From https://github.com/python/cpython
 * branch                  master     -> FETCH_HEAD
Reset branch 'master'

Objects/unicodeobject.c: In function ‘_PyUnicode_CheckConsistency’:
Objects/unicodeobject.c:459:15: warning: variable ‘data’ set but not used [-Wunused-but-set-variable]
         void *data;
               ^~~~
Python/peephole.c: In function ‘PyCode_Optimize’:
Python/peephole.c:258:19: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘Py_ssize_t’ {aka ‘int’} [-Wsign-compare]
     for (j = 0; j < tabsiz; j += 2) {
                   ^
Python/pystrhex.c: In function ‘_Py_strhex_impl’:
Python/pystrhex.c:60:27: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘Py_ssize_t’ {aka ‘const int’} [-Wsign-compare]
     if (abs_bytes_per_sep >= arglen) {
                           ^~

/buildbot/tmp/tmpdir/tmpggoihase/pip-19.0.3-py2.py3-none-any.whl/pip/_vendor/pyparsing.py:3068: SyntaxWarning: invalid escape sequence \w
/buildbot/tmp/tmpdir/tmpggoihase/pip-19.0.3-py2.py3-none-any.whl/pip/_vendor/pyparsing.py:3068: SyntaxWarning: invalid escape sequence \w