[pie_flavor]

Rust is not‡ dynamically linked. The whole tree is compiled from source every time. The same compiler compiles all editions of the language together, and it is exactly the same as py3 interpreting a py2 script and allowing a py3 script to call it or vice versa.

Very few features are restricted to the 2024 edition; only those that actively introduce or leverage breaking changes. Most things released since 2024 are available in 2015 edition. If you want to upgrade to 2024 edition, that is a manifest flag; your code may break when you change it, and there's incompatibility lints available on the lower editions to tell you what will break when that happens and how to fix it.