Displaying -- rand::thread_rng -- using -- println!()

Hello,

The problem:

println!("{:?}",rand::thread_rng());

The question :

It displays this – ThreadRng { rng: UnsafeCell { .. } } – in the cmd, therefore, what would be the meaning of UnsafeCell ? Shouldn't is be displaying random numbers ?

Thanks for the help

Other related question:

Is it possible to write this:

let secret_number = rand::thread_rng().gen_range(1..=100);

like this:

let secret_number = rand::thread_rng(gen_range(1..=100));

?

Thanks and have a good day

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