Not having `nil` is soooo nice. I can't count the number of `Runtime Error`s because some method isn't defined on `NilClass` that have blown things up in weird edge cases.

Knowing exactly what types a method takes and the compiler catching incorrect uses before the code ever runs saves a lot of frustration. Another thing I've enjoyed in Rust include `match` clauses forcing me to define branches for any possibility, especially for `Result` structs. In ruby this isn't possible because anything can be anything.