diff --git a/exercises/options/options2.rs b/exercises/options/options2.rs index 4e36443..337c426 100644 --- a/exercises/options/options2.rs +++ b/exercises/options/options2.rs @@ -18,17 +18,22 @@ mod tests { #[test] fn layered_option() { - let mut range = 10; - let mut optional_integers: Vec> = Vec::new(); - for i in 0..(range + 1) { + let range = 10; + let mut optional_integers: Vec> = vec![None]; + + for i in 1..(range + 1) { optional_integers.push(Some(i)); } + let mut cursor = range; + // TODO: make this a while let statement - remember that vector.pop also adds another layer of Option - // You can stack `Option`'s into while let and if let + // You can stack `Option`s into while let and if let integer = optional_integers.pop() { - assert_eq!(integer, range); - range -= 1; + assert_eq!(integer, cursor); + cursor -= 1; } + + assert_eq!(cursor, 0); } }