there is mistake in explanation of E0382

[olehdevua]

in examle

use std::cell::RefCell;
use std::rc::Rc;

    struct MyStruct { s: u32 }

fn main() {
    let mut x = Rc::new(RefCell::new(MyStruct{ s: 5u32 }));
    let y = x.clone();
    x.borrow_mut().s = 6;
    println!("{}", x.borrow.s);
}

we must use borrow() instead of just borrow