I wanted a reference which covered a small piece of rust to help people get over one piece of the learning curve! What was that piece? How to call functions and return stuff. I know it sounds a little absurd to have to write a tutorial on how to call and return, but rust makes it a little more challenging than other languages in order to be as neato-keen as it is.
This tutorial assumes that you've probably already learned another programming language and can guess at the functionality of some of these snippets (or that you've looked at some other, more complete rust tutorials).
By default, variables are immutable in rust. So the following is an error (run it):
fn main() {