ChainImpl save method

[Andrej Mitrovic]

I'm having trouble understanding this code in std.range.chainImpl:

        @property ChainImpl save()
        {
            auto result = ChainImpl();
            foreach (i, Unused; R)
            {
                result._input[i] = _input[i].save;
            }
            return result;
        }

Specifically, line 1559 which is:
auto result = ChainImpl();

Let me see if I got my hunch right:

Is this simply instantiating another implementation of ChainImpl with the same 
arguments? e.g. inside an already instantiated template with ChainImpl(Range1, 
Range2), would ChainImpl() simply instantiate another ChainImpl template with 
the same compile-time arguments? Of course, it wouldn't copy any runtime values 
since this is all done at compile-time and they don't exist yet.

Btw, I'm having a kick-ass time understanding Phobos as of lately. It only took 
me a couple of months but I am slowly grokking templates, even though I've 
*never* used templates before I tried D.