Backwards compatibility in different programming languages

[PierU]

Coming back on that:

@PierU

About Rust I can read in the link you gave : “Ever since the 1.0 release, the rule for Rust has been that once a feature has been released on stable, we are committed to supporting that feature for all future releases.”. If you translate that for a langage that is ruled by a standard, that means that features are never deleted from the standard.

@plevold

I don’t think that is completely correct. They way I interpret it is that there will always be achieve a certain outcome that was previously possible, but it might not be the same way. For example, in Rust 2018 you could do

panic!(127);

but in Rust 2021 you have to change that to

panic_any!(123);

You can achieve the same thing, but you have to migrate when using later editions.

Actually I still think that in terms of standard it means that once a feature is in, it is never deleted. But I agree that this could make sense only if the standard was following a similar system to the Rust revisions.