Simple reverse words commandline program

Reverse.rs

use std::io;

fn main() {
    // Readline, make sure that the line is not bad, raise error otherwise
    let input = io::stdin().read_line().ok().expect("Failed to read line"); 

    // Take the input as a string slice, rather than a String
    let input_slice: &str = input.as_slice(); 4

    // Get words in a vector, call reverse on it, returning an iterator, 
    // then collect the objects in the iterator into another string slice
    let reversed_input_it: Vec<&str>  = input_slice.words().rev().collect(); 

    // Connect the string elements of the iterator (this function took the longest to find)
    let reversed_string = reversed_input_it.connect(" "); 

    //Print that ish
    println!("{}", reversed_string); 

    // main returns void
    return 
}