A member of the Rust community, barosl, wrote Homu (bors 2.0) which Rust has been using in place of the first bors for a few months now. It's even better than the already-great first version! I'm seriously considering setting it up for my own projects, since I believe it has support for using Travis CI as a testing backend, in addition to buildbot (which Rust and Servo both use).

https://github.com/barosl/homu

Example interaction: https://github.com/rust-lang/rust/pull/23381#issuecomment-80...

Docs: http://buildbot.rust-lang.org/homu/