https://blog.rust-lang.org/2023/09/25/Increasing-Apple-Version-Requirements.html https://blog.rust-lang.org/2023/09/25/Increasing-Apple-Versi... Basically what

https://blog.rust-lang.org/2023/09/25/Increasing-Apple-Version-Requirements.html https://blog.rust-lang.org/2023/09/25/Increasing-Apple-Versi... Basically what you said. Not so much "this could never work" as much "we can't test it so why claim support". And it is a can't test not won't test. Seems the software delivery mechanism doesn't officially support pinning old versions in a way that Rust is comfortable using. Put another way if an end user can't build an old version from a new machine supporting that old version for people who haven't updated at the cost of workarounds isn't a good plan.