Iterating over an inclusive range

We begin the chapter with a small feature that can make your code a bit more readable. The inclusive range syntax (..=) will create a range up to a value including it. This helps you eliminate ugly instances of things like n .. m+1 by rewriting them as n ..= m.

How to do it...

1. Create a Rust project to work on during this chapter with cargo new chapter-ten.
2. Navigate into the newly-created chapter-ten folder. For the rest of this chapter, we will assume that your command line is currently in this directory.
3. Delete the generated lib.rs file, as we are not creating a library.
4. Inside the src folder, create a new folder called bin.
5. In the src/bin folder, create a file called inclusive_range.rs.
6. Add the following code, and run it with cargo run --bin inclusive_range:

1   #![feature(inclusive_range_syntax)]
2   
3   fn main() {
4     // Retrieve the entire alphabet in lower and uppercase:
5     let alphabet: Vec<_> = (b'A' .. b'z' + 1) // Start as u8
6       .map...