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 in assignments. The last expression in the block will be assigned to the l-value. But, if the last expression of the block ends with a semicolon, the return value will be ().

{expression.play}