[pjmlp]

Rust editions are very conservative, expect everything to be built from source, with the same compiler, and don't touch semantic changes across versions, mostly grammar changes.

Example, there is no story for scenario, where a callback defined in one version, is used in another crate version, calling into code, using yet another version, while passing a closure with a specific type with semantic changes across all versions.

I am not yet convinced they will scale at the size of industry use cases for C and C++, with a plethora of compilers, and mixing several editions on a 30 year old codebase.