I am translating this next permutation algorithm in C++:

template<class BidirIt>
bool next_permutation(BidirIt first, BidirIt last)
{
    if (first == last) return false;
    BidirIt i = last;
    if (first == --i) return false;
  
    while (true) {
        BidirIt i1, i2;
  
        i1 = i;
        if (*--i < *i1) {
            i2 = last;
            while (!(*i < *--i2))
                ;
            std::iter_swap(i, i2);
            std::reverse(i1, last);
            return true;
        }
        if (i == first) {
            std::reverse(first, last);
            return false;
        }
    }
}

Into this Rust code:

struct Solution;
impl Solution {
    pub fn next_permutation(nums: &mut Vec<i32>) -> bool{
        if nums.len() < 2 {
            return false;
        }
        let first = 0;
        let last = nums.len();
        let mut i = last - 1;
        loop {
            let i1 = i;
            i -= 1;

            if nums[i] < nums[i1] {
                let mut i2 = last;

                loop {
                    i2 -= 1;
                    if nums[i] < nums[i2] {
                        break;
                    }
                }
                let tmp = nums[i];
                nums[i] = nums[i2];
                nums[i2] = tmp;
                nums[i1..last].reverse();
                return true;
            }
            if i == first {
                nums[first..last].reverse();
                return false;
            }
        }
    }
}

Though it works, I think it's not very good-looking. Any improvement will be welcome!