Build HashSet from a vector in Rust

Question

I want to build a HashSet from a Vec. I\'d like to do this

1. in one line of code,
2. copying the data only once,<

Answer 1

Because the operation does not need to consume the vector¹, I think it should not consume it. That only leads to extra copying somewhere else in the program:

use std::collections::HashSet;
use std::iter::FromIterator;

fn hashset(data: &[u8]) -> HashSet {
    HashSet::from_iter(data.iter().cloned())
}

Call it like hashset(&v) where v is a Vec or other thing that coerces to a slice.

There are of course more ways to write this, to be generic and all that, but this answer sticks to just introducing the thing I wanted to focus on.

¹This is based on that the element type u8 is Copy, i.e. it does not have ownership semantics.