passing_anonymous_functions.rs

fn describe<F: FnOnce()>(message: &str, func: F) {
    println!("{}", message);
    func();
}

fn it<F: FnOnce()>(message: &str, func: F) {
    println!("  - {}", message);
    func();
}

fn main() {
    describe("An array", || {
      it("Should be empty", || {
      });
    });
}