understanding_of_rust_borrow_checker.rs

struct Elem(u32);

struct Slotmap {
    data: Vec<Elem>,
}

impl Slotmap {
    fn get(&self) -> &Elem {
        &self.data[0]
    }
}

struct Index {
    reference: Slotmap,
    table: u32,
}

impl Index {
    fn foo(&mut self) {
        let elem = self.reference.get();
        //let r = self.reference;
        let t = &mut self.table;
    }
}

fn main() {
    let mut idx = Index {
        reference: Slotmap {
            data: vec![Elem(1), Elem(2), Elem(3)],
        },
        table: 42,
    };
    idx.foo();
}