Refcell practice problems in Rust

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Title	Difficulty	Category	Tags
Build `Cell<T>` and `RefCell<T>` from scratch	Hard	Research
Build Rc<T> and RefCell<T> from scratch	Hard	End-to-End
Build tree paths with an arena and Rc	Hard	End-to-End
RAII: build your own guard	Medium	Primitives
`Rc<RefCell<T>>`: shared inboxes and an arena alternative	Hard	End-to-End
`RefCell<T>`: borrowing checked at runtime	Medium	Primitives
Reference cycles leak memory	Hard	Primitives
Share a log with RefCell and report borrow conflicts	Medium	Primitives
Trace a lazy map, filter and take pipeline	Easy	Primitives
`Weak<T>`: non-owning references that break cycles	Hard	Primitives
When `RefCell` panics: re-entrancy and borrows held too long	Hard	Primitives