Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The read_line() method returns a value of type IoResult<String>, which is a specialized Result type."

A block of code is set as follows:

match magician {
      "Gandalf" => println!("A good magician!"),
      "Sauron"  => println!("A magician turned bad!"),            _         => println!("No magician turned up!")
   }

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

match magician {
      "Gandalf" => println!("A good magician!"),
      "Sauron"  => println!("A magician turned bad!"),            _         => println!("No magician turned up!")
   }

Any command-line input or output is written as follows:

# rustc welcome.rs -o start

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "When working with Rust code, select Tools | Build System and RustEnhanced."