macro_rules! build_from_paths {
    ($base:expr, $($segment:expr),+) => {{
        let mut base: ::std::path::PathBuf = $base.into();
        $(
            base.push($segment);
        )*
        base
    }}
}

fn main() {
    use std::path::{Path, PathBuf};
    use std::ffi::OsStr;

    let a = build_from_paths!("a", "b", "c");
    println!("{:?}", a);

    let b = build_from_paths!(PathBuf::from("z"), OsStr::new("x"), Path::new("y"));
    println!("{:?}", b);

}

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

fn join_all<P, Ps>(parts: Ps) -> PathBuf
    where Ps: IntoIterator<Item = P>,
          P: AsRef<Path>
{
    parts.into_iter().fold(PathBuf::new(), |mut acc, p| {
        acc.push(p);
        acc
    })
}

fn main() {
    let parts = vec!["/usr", "bin", "man"];
    println!("{:?}", join_all(&parts));
    println!("{:?}", join_all(&["/etc", "passwd"]));
}

use std::path::PathBuf;
let path: PathBuf = [r"C:", "windows", "system32.dll"].iter().collect();