Rust has a pattern-matching "let" and then you can prefix names within any pattern with "mut" to make it mutable. So a basic mutable var is "let mut" but it's j

Rust has a pattern-matching "let" and then you can prefix names within any pattern with "mut" to make it mutable. So a basic mutable var is "let mut" but it's just a combination of two other features. I think it's a totally neat design.