References and Borrowing - The Rust Programming Language
rust-book.cs.brown.edu/ch04-02-references-and-borrowing.html
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t is illegal to use a mutable reference to a value (s3) while an immutable reference is live (s2).
References provide the ability to read and write data without consuming ownership of it. References are created with borrows (& and &mut) and used with dereferences (*), often implicitly.
F does not change throughout the body of a function
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