[erickt]

Rust Core/Community Team member here, who helped design the survey. You got it. We asked this question to check whether or not we're succeeding at maintaining our backwards compatibility. While we have great visibility on if we're breaking our open source community with tools like cargobomb [1], we don't have great visibility into running tests against our commercial users (which we got a ton now! [2]).

[1]: https://github.com/rust-lang-nursery/cargobomb [2]: https://www.rust-lang.org/en-US/friends.html