if foo.validate() {
println!("{} is the right answer", foo);
}
This has less parentheses (unless you count the placeholder in the format string). Putting the condition in parentheses like C and friends do is redundant if you use braces for the block anyway.
less parentheses, but not less bracket-like characters. If you count parens and curlies, it is exactly the same. Yours has 4 parens and 2 curlies (not including the format string), and the original lisp code has 6 parens.
