Getting value from a collection without using the Clone trait

Is it possible to get a value from a collection and apply a method to it which accepts only self and not &self?

Minimal Working Example

What I would like to write is something akin to:

use std::collections::HashMap;

fn get<B>(key: i32, h: HashMap<i32, Vec<(i32, B)>>) -> i32 where B: Into<i32> {
    let v: &Vec<(i32, B)> = h.get(&key).unwrap();
    let val: &B = v.first().unwrap().1;

    // Do something to be able to call into
    // I only need the value as read-only
    // Does B have to implement the Clone trait?
    return val.into();
}

I have tried in vain to dribble mut here and there to try to appease compiler error after compiler error, but this is really a fool's errand.

use std::collections::HashMap;

fn get<B>(key: i32, mut h: HashMap<i32, Vec<(i32, B)>>) -> i32 where B: Into<i32> {
    let mut v: &Vec<(i32, B)> = h.get_mut(&key).unwrap();
    let ref mut val: B = v.first_mut().unwrap().1;
    return (*val).into();
}

Is this sort of thing even possible or does B have to implement the Clone trait?

I've also tried:

• Unsafe
• Raw pointers

I've not tried:

• Box
• Other Rust constructs that I have not encountered, I mention this to explicitly state that I have not omitted any approaches that I know of.