Nested imports with use - The Edition Guide

# Nested imports with `use`

A new way to write `use` statements has been added to Rust: nested import groups. If you’ve ever written a set of imports like this:

    #![allow(unused)]
    fn main() {
    use std::fs::File;
    use std::io::Read;
    use std::path::{Path, PathBuf};
    }

You can now write this:

    #![allow(unused)]
    fn main() {
    mod foo {
    // on one line
    use std::{fs::File, io::Read, path::{Path, PathBuf}};
    }

    mod bar {
    // with some more breathing room
    use std::{
        fs::File,
        io::Read,
        path::{
            Path,
            PathBuf
        }
    };
    }
    }

This can reduce some repetition, and make things a bit more clear.