Multiple assignment into unique_ptr using make_unique

Is a multiple assignment into unique < T > pointer valid? Based on output it is, but is T destructor calling guaranteed when make_unique is called and value is assigned to already allocated memory?

#include <iostream>
#include <string>
#include <memory>

class A{
public:
    A(){ std::cout << "Construcor" << std::endl;}
    ~A(){ std::cout << "Destrucor" << std::endl;}
    void foo(){std::cout << "foo" << std::endl;}
};

int main()
{
    std::unique_ptr<A> pointer;
    for(auto i = 0; i< 2; ++i){
        pointer = std::make_unique<A>();
        pointer->foo();
    }
}

output:

Construcor
foo
Construcor
Destrucor // Destructor is called because first instance of A is out of scope?
foo
Destrucor