&gt; We have had a code stability promise for months now in 1.0. So what you are saying here is that you do not believe that Rust will adhere to what it very publicly planned to do. Do you have specific reasons for this?<p>Since 1.0, Rust has in fact had multiple significant stable-breaking compiler changes, not to mention that, among other things, adding any new method to a trait or type in the standard library has the potential to cause breakage.  The official code stability promise has not been violated by these changes only because it&#x27;s riddled with exceptions.