The error occurs because the n.to_string().as_str() expression creates a temporary value (a String instance) that is returned as a reference (&str). But since it's a temporary value, it will be dropped immediately after the function returns, leaving the returned reference pointing to invalid data.

To fix it, you can change the return type of the function to String and return a new String instance instead of a reference:

javascript

fn fizzbuzz(n: usize) -> String {
    match (n % 3, n % 5) {
        (0, 0) => "fizzbuzz".to_string(),
        (0, _) => "fizz".to_string(),
        (_, 0) => "buzz".to_string(),
        _ => n.to_string(),
    }
}
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