What is ownership
Each value has an owner. There is only one owner at a time. When the owner leaves the scope, the value is released.
Three major rules
Each value has an owner; Same owner at the same time; The owner is out of scope and the value is discarded.
Borrowing rules
It is possible to borrow multiple non changeable items or borrow one mutable item. Cannot have both mutable and immutable borrowing at the same time.
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