[Advanced Rust] 1.10. References and Interior Mutability (Quick Recap) - References, Interior Mutability, Cell Type, and Relate…

Rust enforces safe borrowing through shared and mutable reference rules and strict ownership constraints.

You generally cannot move values out of a referenced location, and moving out of a mutable reference is disallowed by default.

Instead, patterns like `std::mem::replace` let you safely swap values, while `Copy` types have more flexible behavior.

When mutation is needed through shared references, interior mutability tools such as `Cell` provide controlled, safe updates.