Function validatron::validators::is_max_length

pub fn is_max_length<C>(iterable: C, max_length: usize) -> Result<()> where
    C: IntoIterator, 

Check that a sequence is at most a certain length

let x = vec![1,2,3,4,5];
assert!(is_max_length(&x, 10).is_ok());
assert!(is_max_length(&x, 5).is_ok());
assert!(is_max_length(&x, 2).is_err());