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[[Rust]]
[[Mutable references are safe because they prevent aliasing]]
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Because references are also immutable by default, if we would declare a variable mutable such as `let mut guess = String::new();` and we were to pass a references to guess to another function, we must place the `mut` keyword there as well as such: `read_line(&mut guess)` rather than just `read_line(&guess)`.
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