“Rustarmanriazierror [E0596]: Kann nicht selbst ausleihen.” Code-Antworten

Rustarmanriazierror [E0596]: Kann nicht selbst ausleihen.

//Resovled by using Interior Mutability
use std::cell::RefCell;
borrow_mut().push()
borrow().len()
//
When creating immutable and mutable references, we use the & and &mut syntax, respectively. With RefCell<T>, we use the borrow and borrow_mut methods, which are part of the safe API that belongs to RefCell<T>. The borrow method returns the smart pointer type Ref<T>, and borrow_mut returns the smart pointer type RefMut<T>.
Both types implement Deref, so we can treat them like regular references.
The RefCell<T> keeps track of how many Ref<T> and RefMut<T> smart pointers are currently active. Every time we call borrow, the RefCell<T> increases its count of how many immutable borrows are active.
When a Ref<T> value goes out of scope, the count of immutable borrows goes down by one. Just like the compile-time borrowing rules, RefCell<T> lets us have many immutable borrows or one mutable borrow at any point in time.