Treat def f(a, b=1, c): ... as an error (missing default for c) instead of silently supplying a default of None fore c.
Treat def f(a, b=1, c): ... as an error (missing default for c)
instead of silently supplying a default of None fore c.

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