rubyspec/mspec — pull request #43 by kachick (2013-07-26 10:50:21+00:00)
Title: IOStub#puts should append "\n" when argument not given

I have noticed from https://github.com/kachick/rubinius/commit/d996005b2d6491be83d9c552323f0f51f9c80554#L0R64 behavior.