Using memberspaces for a property-like syntax and more

[TommiT]

I propose we just forget about the whole concept of a property, 
and instead add to D a new construct called 'memberspace'. 
Memberspace subdivides the 'space' in which the member functions 
and operators of a type live into separately named 'subspaces', 
like namespaces do for freestanding functions and classes in C++. 
Read more about the uses of this idea over there (it's not my 
idea):

http://accu.org/index.php/journals/1527
Here's how it could look like:

struct S
{
    int _value;

    memberspace space1
    {
        int opCall() const
        {
            return _value;
        }

        void opAssign(int v)
        {
            _value = v;
        }

        void method() const { }
    }

    memberspace space2
    {
        static int opCall()
        {
            return 123;
        }
    }
}

void main()
{
    S var;
    var.space1 = 42;
    assert(var.space1() == 42);
    assert(S.space2() == 123);
    var.space1.method();

    int n1 = var.space1; // error
    int n2 = S.space2;   // error
}

Now, imagine replacing the name of your memberspace with the name 
of the thing you used to call a 'property'.