Calculo factorial RUST

fn factorial (n: u32) -> u32 {

    if n==0{
        return 1;
    }

    let mut product =1;

    for i in 1..=n{
        product *=dbg! (i);
    }

     product
}

fn main(){
    let n=-1;
    println! ("{n}! ={}",factorial(n));
}