That was true prior to last year's 1.0 being released, but since then code no longer breaks, (in any major ways anyway, there's been some soundness fixes for th

That was true prior to last year's 1.0 being released, but since then code no longer breaks, (in any major ways anyway, there's been some soundness fixes for the good of the language's future). Also, the Rust teams runs any potentially breaking changes against the crates at crates.io and they even sent fixes to existing crates in the past.