The first thing we'll learn about are 'variable bindings.' They look like this:
```{rust}
-let x = 5i;
+fn main() {
+ let x = 5i;
+}
```
+Putting `fn main() {` in each example is a bit tedious, so we'll leave that out
+in the future. If you're following along, make sure to edit your `main()`
+function, rather than leaving it off. Otherwise, you'll get an error.
+
In many languages, this is called a 'variable.' But Rust's variable bindings
have a few tricks up their sleeves. Rust has a very powerful feature called
'pattern matching' that we'll get into detail with later, but the left