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: iter.rs
    path of file: ./repos/cargo-spellcheck/src/traverse
    
    the code of the file until where you have to start completion: use super::*;
use crate::Documentation;

use fs_err as fs;

use std::path::{Path, PathBuf};

/// An iterator traversing module hierarchies yielding paths
#[derive(Debug, Clone)]
pub struct Trave
    
    pub fn collect_modules(&mut self, path: &Path, level: usize) -> Result<()> {
        if path.is_file() {
            log::trace!("ðŸ¥ž collecting mods declared in file {}", path.display());
            self.queue.extend(
                extract_modules_from_file(path)?
                    .into_iter()
                    .map(|item| (item, level)),
            );
        } else {
            log::warn!("ðŸ¥ž Only dealing with files, dropping {}", path.display());
        }
        Ok(())
    }