You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/turbo/crates/turborepo-wax/src/walk
    
    the code of the file until where you have to start completion: //! Traversal and matching of files and directory trees.
//!
//! This module provides APIs for walking directory trees and matching files in
//! a directory tree against [`Program`]s using [`Iterator`]s. These iterators
//! implement [`FileIterator`], which supports efficient filtering that can
//! cancel traversal into sub-trees that are discarded by combinators.
//!
//! # Examples
//!
//! To iterate over the files in a directory tree, use the [`PathExt`] trait.
//!
//! ```rust,no_run
//! use std::path::Path;
//! use wax::walk::{Entry, PathExt as _};
//!
//! let root = Path::new(".config");
//! for entry in root.walk() {
//!     let entry = entry.unwrap();
//!     println!("{:?}", entry.path());
//! }
//! ```
//!
//! To match a [`Glob`] against a directory tree, use [`Glob::walk`]. This
//! function constructs an iterator that efficiently matches a [`Glob`] again
    
    fn walk_tree_with_empty_not() {
        let (_root, path) = temptree();

        let paths: HashSet<_> = path
            .walk()
            .not([""])
            .unwrap()
            .flatten()
            .map(Entry::into_path)
            .collect();
        assert_set_eq!(
            paths,
            // The root directory (`path.join("")` or `path.to_path_buf()`) must not be present,
            // because the empty `not` pattern matches the empty relative path at the root.
            [
                path.join("doc"),
                path.join("doc/guide.md"),
                path.join("src"),
                path.join("src/glob.rs"),
                path.join("src/lib.rs"),
                path.join("tests"),
                path.join("tests/harness"),
                path.join("tests/harness/mod.rs"),
                path.join("tests/walk.rs"),
                path.join("README.md"),
            ]
            .into_iter()
            .collect(),
        );
    }