As announced here:
https://hacks.mozilla.org/2016/07/shipping-rust-in-firefox/
The next version of Firefox will need a new compiler. To start getting ready for this RUST is added to the [build] repo:
http://kaosx.tk/packages/index.php?act=show&subdir=build&sortby=date&file=rust-1.10.0-1-x86_64.pkg.tar.xz
To make sure compilation and settings are correct for RUST, Firefox 4.8beta7 is added in build too. The resulting package is smaller then with a Clang build, seems very fast.
This version won't move to the stable repos, but any feedback if regressions are found with using RUST to compile would be appreciated.