Rust & vs. ref.md

#![feature(core_intrinsics)]

fn main() {
    let x = &false;
    print_type_name_of(x);

    let &x = &false;
    print_type_name_of(x);

    let ref x = &false;
    print_type_name_of(x);
}

fn print_type_name_of<T>(_: T) {
    println!("{}", unsafe { std::intrinsics::type_name::<T>() })
}

&bool
bool
&&bool

ref on the left side of = is the same as & on the right.

let ref x = 1;
let x = &1;

& on the left side of = is the same as * on the right.

let &y = x;
let y = *x;