The Rust 1.14 release is Thursday, and a build is available for testing:
rustup update stable-2016-12-18
Please give it a shot. Note that this build contains a regression in the way cargo is linked on MSVC. It seems to require the MSVC 2015 redistributable to run. @alexcrichton is working on a fix and we’re hoping to do one more stable build before the release.
The previous build of 1.14 remains in the archives at stable-2016-12-18 for now. The only difference is the build of cargo is from a slightly different commit and cargo is linked incorrectly on MSVC. I probably should go back and delete it, but don’t want to try anything risky right now.