The topic of the Rust experiment was just discussed at the annual Maintainers Summit. The consensus among the assembled developers is that Rust in the kernel is no longer experimental — it is now a core part of the kernel and is here to stay. So the “experimental” tag will be coming off. Congratulations are in order for all of the Rust for Linux team.
The consensus seems to be that implementation inheritance leads to code that is difficult to understand and difficult to reuse. Its perhaps the main reason C++ is banned from the kernel.