Calling a function with a &&

The following code all works just fine

fn test(n: &isize) -> isize {

fn main() {
    let a = 3;
    println!("{}", test(&a));
    println!("{}", test(&&a));
    println!("{}", test(&&&a));
Where can I find the documentation of this feature, and how do you call it?

Google: Deref coercion.

OK, but does it mean then that the Deref trait is implemented for &isize?

Yes, see here and here.


Yes, because it is in general implemented for &T for all possible referent types T, including isize.

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