Adding a warning about the regex module.  This is the first official use of PyErr_Warn()!  This module is a good guinea pig because it's been obsolete since 1.5.0 was released.
Adding a warning about the regex module.  This is the first official
use of PyErr_Warn()!  This module is a good guinea pig because it's
been obsolete since 1.5.0 was released.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator