如何在Rust中按非连续的Vec元素进行分组？

use itertools::Itertools;

fn main() {
    let vec = vec![1, 2, 2, 3, 3, 3, 4, 5, 5, 6];
    
    let groups = vec.into_iter().group_by(|&x| x);
    
    for (key, group) in &groups {
        println!("Key: {}", key);
        println!("Group: {:?}", group.collect::<Vec<_>>());
    }
}

Key: 1
Group: [1]
Key: 2
Group: [2, 2]
Key: 3
Group: [3, 3, 3]
Key: 4
Group: [4]
Key: 5
Group: [5, 5]
Key: 6
Group: [6]