| In Rust, almost every statement is an expression, this means that the statement |
| returns a value. This may not always be desired, so the output can be |
| suppressed by ending the expression with a semicolon `;`. |
| |
| Blocks are expressions too, so they can be used as |
| [r-values](https://en.wikipedia.org/wiki/Value_%28computer_science%29#lrvalue) |
| in assignments. The last expression in the block will be assigned to the |
| [l-value](https://en.wikipedia.org/wiki/Value_%28computer_science%29#lrvalue). |
| But, if the last expression of the block ends with a semicolon, the return |
| value will be `()`. |
| |
| {expression.play} |
