fn main() {
    let length = 10;
    let mut width = 5;
    println!(
        "The oringinal dimensions are length = {} and width = {}",
        length, width
    );
    width = width + 3;
    let length = length * 2;
    println!(
        "The new dimensions are length = {} and width {}.",
        length, width
    );
}

(Playground)

Output:

The oringinal dimensions are length = 10 and width = 5
The new dimensions are length = 20 and width 8.

Errors:

   Compiling playground v0.0.1 (/playground)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.65s
     Running `target/debug/playground`

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