That kind of non-safe memory sharing doesn't exist in Rust, unless you explicitly mark code as 'unsafe'. If you want to write a variable, nobody else is allowed

That kind of non-safe memory sharing doesn't exist in Rust, unless you explicitly mark code as 'unsafe'. If you want to write a variable, nobody else is allowed to read it until you are finished, and this is enforced at compile time via the language design. The same is true for all data structures.