Unexpected copy constructor behavior

[psycha0s via Digitalmars-d-learn]

I was learning copy constructors and got a really weird result. 
It looks like a copy constructor and a destuctor of two unknown 
objects are called. Could somebody please explain it to me?

import std.stdio;
struct Foo {
        int value;

        this(int n)
        {
                value = n;
                writeln("constuctor ", &this);
        }

        ~this()
        {
                writeln("destuctor ", &this);
        }

        this(ref return scope Foo other)
        {
                value = other.value;
                writeln("copy constuctor ", &this);
        }
}

void main()
{
        writeln("begin");
        auto foo1 = Foo(1);
        auto foo2 = foo1;
        writeln("---");
        foo2 = foo1;
        writeln("===");
        writeln("end");
}

The output:

begin
constuctor A3D3EFF860
copy constuctor A3D3EFF864
---
copy constuctor A3D3EFF880     // <--
destuctor A3D3EFF808           // <--
===
end
destuctor A3D3EFF864
destuctor A3D3EFF860