rails/rails — pull request #16680 by huoxito (2014-08-24 18:27:58+00:00)
Title: treetop is no longer a mail (rails) dependency

see https://github.com/mikel/mail/commit/2da7c7985c221272f6451b27ab8b41e84e0a6804

noticed this one while looking at https://github.com/rails/rails/issues/16614