Rust's standard library has a lot of built-in traits. Most of the syntatic sugar in Rust is due to traits. These traits also provide a nice baseline upon which crate authors can provide an idiomatic interface to their libraries. In this section, we'll explore some of the abstractions and conveniences of the standard library traits that enhance the experience for a crate author and the consumer. We'll base our exploration from a library author's perspective and create a library that provides support for complex number types. This example serves well to introduce the common traits you have to implement if you are creating a crate of your own.
We'll create a new project by running cargo new complex --lib. To start with, we need to represent our complex number as a type. We'll use a struct for this. Our complex number...
