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In Rust, variables are immutable by default. This is one of many nudges Rust gives you to write code in a way that takes advantage of the safety and easy concurrency that Rust offers.
However, you still have the option to make your variables mutable. We do this by adding mut in front of the variable name.
let x = 5;
// x = 6; // Error!
let mut y = 5;
y = 6; // OK!
// Challenge: Fix the error by making 'x' mutable.
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