I’ve been using the proposed await! and Future features in nightly Rust, and overall, I really like the design. But I did run into one surprise: await! may never return, and has consequences I didn’t fully understand. Let’s take a look. We’re going to use Rust nightly-2019-02-08, and tokio-async-await. This is highly experimental code, and it will require us to convert back and forth between tokio::Future and the proposed std::future::Future. You can find the full code on GitHub. We...
