[littlestymaar]

There's tooling, that's right but I was refering to some kind of language stability commitment (like the one Rust has for instance). I find it surprising that there are language constructs made to help libraries being forward compatible (and that Swift is a leader in that domain), while the language itself is way less stable than most languages (which doesn't shock me since it's still pretty recent, and has really ambitious goals which are understandably hard to achieved on the first try).