| Most of times, we'll like to access some data, without taking ownership over | |
| it. To accomplish this, Rust provides a *borrowing* mechanism. Instead of | |
| passing objects by-value (`T`), objects can be passed by reference (`&T`). | |
| {borrow.play} | |
| The compiler statically guarantees that references *always* point to valid | |
| objects, via its borrow checker. For example, the original object can't be | |
| destroyed, while references to it exists. |