borrowing_exerci 0.4.51

how to understand the borrowing in rust
Documentation 
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#![allow(unused)]

#[cfg(feature = "ok")]
fn main() {
    let i = 42;
    let copy_i = i;
    println!("{}", i);
    println!("{}", copy_i);

    let v = vec![1, 2, 3, 4];
    let moved_v = v.clone();
    println!("{:?}", v);
    println!("{:?}", moved_v);

    #[derive(Debug, Clone)]
    struct Pair(u8);
    let pair = Pair(1);
    println!("original: {:?}", pair);
    let moved_pair = pair.clone();
    println!("copy: {:?}", moved_pair);
    println!("original: {:?}", pair);
}

// error[E0382]
#[cfg(feature = "err")]
fn main() {
    // allocated on the stack,
    // the actual value is copied, instead of transferring ownership.
    let i = 42;
    let copy_i = i;
    println!("{}", i);
    println!("{}", copy_i);

    // allocated on the heap,
    // the ownership is transferred
    let v = vec![1, 2, 3, 4];
    let moved_v = v; // value moved here
    println!("{:?}", v); // value borrowed here after move
    println!("{:?}", moved_v);

    #[derive(Debug, Clone)]
    struct Pair(u8);
    let pair = Pair(1);
    println!("original: {:?}", pair);
    let moved_pair = pair;
    println!("copy: {:?}", moved_pair);
    println!("original: {:?}", pair);
}

#[cfg(all(not(feature = "ok"), not(feature = "err")))]
fn main() {
    use aide::*;
    hello();
}