i have error rbtree.rs:53:24: 53:33 error: assigning to mutable field prohibited due to outstanding loan rbtree.rs:53 None => self.left = Some(self.make_child(k, v)) ^~~~~~~~~ rbtree.rs:51:18: 51:27 note: loan of mutable field granted here rbtree.rs:51 match self.left { ^~~~~~~~~

gistfile1.rs

    pub fn insert(&mut self, k: K, v: V) {
        if k < self.key {
            match self.left {
                Some(ref mut l) => l.insert(k, v),
                None => self.left = Some(self.make_child(k, v))
            }
        }
        else if k > self.key {
            match self.right {
                Some(ref mut r) => r.insert(k, v),
                None => self.right = Some(self.make_child(k, v))
            }
        }
    }