mitchellh/vagrant — pull request #2693 by oalders (2013-12-20 05:56:07+00:00)
Title: Reduces use of split infinitives.

Some would argue that split infinitives can be considered to be correct,
but the issue in these cases is that the phrasing is a bit smoother
without them.

I came across one of these error messages today and had to read it a couple of times before I understood it completely. I think these grammatical changes make the intent somewhat clearer.