Function cop::ptr::normalise

pub fn normalise<'a, T, Q: ?Sized>(
    x: T, 
    arena: &'a Arena<T>, 
    set: &mut HashSet<&'a Q>
) -> &'a Q where
    T: Deref<Target = Q>,
    Q: Eq + Hash, 

Return equal pointers for any two equal dereferenceable objects.

use colosseum::unsync::Arena;
use hashbrown::HashSet;

let s1 = "Hello".to_string();
let s2 = "Hello".to_string();
assert!(!(core::ptr::eq(&*s1, &*s2)));

let arena: Arena<String> = Arena::new();
let mut set: HashSet<&str> = HashSet::new();
let p1 = normalise(s1, &arena, &mut set);
let p2 = normalise(s2, &arena, &mut set);
assert!(core::ptr::eq(p1, p2));