Rust Programming Cookbook

How to do it...

Follow these steps to learn more about traits:

1. Create a new project using cargo new trait-bounds and open it in your favorite editor.
2. Edit src/main.rs to add the following code, where we can easily print a variable's debug format since an implementation of that format is required on compilation:

////// A simple print function for printing debug formatted variables/// fn log_debug<T: Debug>(t: T) {    println!("{:?}", t);}

3. If we were to call this using a custom type such as struct AnotherType(usize), the compiler would quickly complain:

$ cargo run   Compiling trait-bounds v0.1.0 (Rust-Cookbook/Chapter02/trait-bounds)error[E0277]: `AnotherType` doesn't implement `std::fmt::Debug`  --> src/main.rs:35:5   |35 | log_debug(b); | ^^^^^^^^^ ...