Here is a koan. Shared mutable state is evil. So functional programming languages thought: let's have no mutable state. So Rust thought: let's have no sharing

Here is a koan. Shared mutable state is evil. So functional programming languages thought: let's have no mutable state. So Rust thought: let's have no sharing of state. Rust is not a functional programming language. It is a different approach to the same problem.