Elegant State Machine Patterns in Rust

This article explores various approaches to implementing state machine patterns in Rust, comparing their advantages and disadvantages. The author starts with a simple enum approach, iteratively refining it to a solution leveraging generics and the From/Into traits. This final approach enables compile-time state transition checks and provides clear error messages. Multiple code examples, including a simulated bottle-filling machine and a simplified Raft protocol implementation, illustrate these methods.