C++ :: Pass By R-reference - Unique Objects That Have Been Explicitly Moved

I'm using mingw with gcc 4.4.1. I'm trying to write a function that operates only on unique objects that have been explicitly moved.

Code:
#include <iostream>
#include <memory>
typedef std::unique_ptr<int> unique;
void eat(unique&& i)
{
std::cout << *i << std::endl;

[Code] ....

This is confusing to me because it compiles, yet my unique i is passed by R-value reference, without ever being explicitly moved. I thought named objects could NEVER be considered R-value references... Am I wrong to think that the above is extremely dangerous? After the call to "eat", my "i" has been destroyed internally, I could save by passing by value:

Code:
#include <iostream>
#include <memory>
typedef std::unique_ptr<int> unique;
void eat(unique i) {
std::cout << *i << std::endl;
[Code] ....

But at this point, I'm paying for a (theoretically cheap) move copy, when I could be paying nothing at all... A third solution would be to overload with a const ref version, but at this point, I get an obscure linker error, when I'm really looking for a compiler error...

Code:
#include <iostream>
#include <memory>
typedef std::unique_ptr<int> unique;
void eat(const unique&);
void eat(unique&& i)

[Code] ....

I'm actually trying to write a container that manages unique objects, and was trying to write a function that accepts only moved objects.