A few books have still examples for static mut variables. So I added one myself, telling that one should avoid them. But I think in last year the example was compiling, but now with Rust 2024 it fails in the playground, and I am unsure how I should modify the example and the text. The easiest way would be to just say that use of static mut is not longer permitted. Is that good enough? I discovered that a #![allow(static_mut_refs)] makes it compile in the playground. I will try to give a link to the playground example code, it is from section Variables and mutability - Rust for C-Programmers of the book.

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