// Q: why do we need to first assign a vector to a variable and use the variable
//    to do things to the vector? Why can't we do things directly to the vector?
//    See code below for examples.
// It seems Rust was intentionally designed in this fashion because the first
// rule of ownership is
//    "Each value in Rust has a variable that’s called its owner."

fn main() {
    let mut v = vec![1];
    v.push(2);
    println!("{:?}", v);

    // why can't we just do one of the following?
    println!("{:?}", vec![1].push(2)); // () because ?
    println!("{:?}", (&mut vec![1]).push(2)); // () because ?
}