This is (should be) the exact equivalent of the Cilia code in Rust:

• Types
  • isize, i32, i64, f32
• Variables
  • let mut x: i64 = 42;
  • let mut x = 42;
  • let x = 42;
  • let mut words: Vec<String> = Vec::new();
  • let mut names: HashSet<String> = HashSet::new();
  • let mut contactInfoForID: HashMap<String, ContactInfo> = HashMap::new();
• Functions
  • fn multiply(a: i64, b: i64) -> i64 { return a * b; }
  • fn print(a: &ContactInfo) { ...; }
  • fn concat(a: &str, b: &str) -> String { return ...; }
• Loops
  • for i in 1..=10 { ...; }
  • for i in 0..words.len() { ...; }
  • for i in [5, 7, 11, 13].iter() { ...; }
  • for word in words.iter() { ...; }

In Rust 42 is an i32, not an i64.
That’s Ok, this is a syntax comparison, not a performance benchmark.