Yes. You are right. I don't need the nightly features of Rust in this post. I just took the convenience of experimenting Rocket and Diesel with the Rust nightly compiler in my second post: https://genekuo.medium.com/creating-a-rest-api-in-rust-with-persistence-rust-rocket-and-diesel-a4117d400104. So I use the same here. We should use the stable version whenever developing in production. Thanks for pointing that out.