The nightly binaries provided on rust-lang.org do not include the fonts 'Fira Sans' and 'Heuristica' that should normally be located within the doc directory. This might be an issue with the build process or the rust buildbot, and could be related to the recent inclusion of these fonts to the local documentation. [https://github.com/mozilla/rust/commit/395d8857d60c66876d41484d6caea05c03882fad]

I'm going to try to identify the underlying problem. I will share my findings in a couple hours.