For those who might not have seen it, you can use this to make a `while` act like a `do-while` loop by putting the entire body in the boolean clause (and then putting an empty block for the actual body):

    // double the value of `x` until it's at least 10
    while { x = x * 2; x < 10 } {}

This isn't something that often will end up being more readable compared to another way to express it (e.g. an unconditional `loop` with a manual `break`, or refactoring the body into a separate function to be called once before entering the loop), but it's a fun trick to show people sometimes.