Retrieve a vector containing all entries within a provided directory

Example

use std::io;
use std::io::fs;

// one possible implementation of fs::walk_dir only visiting files
fn visit_dirs(dir: &Path, cb: |&Path|) -> io::IoResult<()> {
    if dir.is_dir() {
        let contents = try!(fs::readdir(dir));
        for entry in contents.iter() {
            if entry.is_dir() {
                try!(visit_dirs(entry, |p| cb(p)));
            } else {
                cb(entry);
            }
        }
        Ok(())
    } else {
        Err(io::standard_error(io::InvalidInput))
    }
}

Error

Will return an error if the provided from doesn't exist, the process lacks permissions to view the contents or if the path points at a non-directory file