You don't have to, because you don't end up with }}}}}}}}} in Rust, because statements end with ; and not }.
} } }
}); } }); }
2. Scheme is better than Common Lisp when it comes to Lots of Irritating Superfluous Parenthesis, since declaring a variable in Scheme (using 'define') doesn't create a new nesting like it does in Common Lisp (using 'let').