Let's say we wanted to write an HTTP server library for Zig. At the core of this library, we might have a pool of threads to handle requests. Keeping things simple, it might look something like: fn run(worker: *Worker) void { while (queue.pop()) |conn| { const action = worker.route(conn.req.url); action(conn.req, conn.res) catch { // TODO: 500 }; worker.write(conn.res); } } As a user of this library, a sample action might be: fn greet(req: *http.Request, res: *http.Response) void { res.status = ...