Code shared from the Rust Playground

playground.rs

#![allow(unused)]
#![feature(generators, generator_trait)]

use std::ops::{Generator, GeneratorState};

fn main() {
    let mut generator = || {
        yield 1;
        return "foo"
    };

    match unsafe { generator.resume() } {
        GeneratorState::Yielded(one) => { println!("{}", one) }
        _ => panic!("unexpected return from resume"),
    }
    match unsafe { generator.resume() } {
        GeneratorState::Complete(returned) => { println!("{}", returned)}
        _ => panic!("unexpected return from resume"),
    }
}