Web Reference: Let’s explore how and why Rust encourages you to favor immutability and why sometimes you might want to opt out. When a variable is immutable, once a value is bound to a name, you can’t change that value. 15 hours ago · 3.1.2 Variables and Constants Many people who start learning Rust cannot clearly distinguish between immutable variables and constants (constant). Although constants are also immutable once assigned, they differ significantly from immutable variables: Constants cannot use mut; once declared, they are immutable. This error also applies to implicit references, such as those created when printing static mut variables or calling methods on them, as shown by the println! and len() examples above.
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