Compile time magic.

I Accidentaly Wrote A Compile-Time Executable State Machine

by Philippe M. Groarke

From the article:

Yes, you read that title right. While working on a new way to create finite state machines (fsm), I inadvertently designed a state machine you can execute at compile-time. With branching and everything. Today, allow me to pull you down my rabbit hole. It’s always nicer with company down here.

Let’s go, Alice!