Quick note for how to use async/await syntax with Trait in Rust
Rust supports asynchronous programming with async and await syntax since Rust 1.39.0.
https://blog.rust-lang.org/2019/11/07/Rust-1.39.0.html
[Asynchronous Programming in Rust](https://rust-lang.github.io/async-book/) would be the best material to learn asynchronous programming in Rust.
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