Add the missing semicolon to the end of the let statement
@@ -48,7 +48,7 @@ fn add(x: i32, y: i32) -> i32 {
```rust
// this won't compile; `a` is used before its binding is defined
let b = a;
-let a = x + y
+let a = x + y;
```
Rust uses curly braces (`{}`) to define a scope. A binding defined within a scope can't escape from it.
