rust-lang/rust — pull request #18320 by chastell (2014-10-25 21:00:30+00:00)
Title: Guide: drop :d formatting where unnecessary

I'm working my way through the Guide and it seems the `:d` formatting in these places is unnecessary. As the Guide doesn’t explain it before the first use, I’d say like plain `{}` interpolation (which was explained) is better in these places.