Rename a local variable for readability and change a "this can't happen" print() call into a RuntimeWarning as it should've been in the first place.  Because nothing should ever cause unexpected stdout output.
Rename a local variable for readability and change a "this can't
happen" print() call into a RuntimeWarning as it should've been in the
first place.  Because nothing should ever cause unexpected stdout output.

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