Encapsulate return value in scoped

[Yuxuan Shui via Digitalmars-d-learn]

On Thursday, 11 June 2015 at 08:48:22 UTC, Yuxuan Shui wrote:
> Is there a way to encapsulate return value into scoped?
>
> Say I have a function that returns a new object:
>
> X new_x(T t...) {
>     //Super complex input processing
>     return new X(something);
> }
>
> And I want to encapsulate the result using scoped, is that 
> possible? Can I just do:
>     return scoped!X(something).
> ?
>
> If I understand correctly, the data will be blitted, but the 
> destructor will be called, so the returned object will be in 
> invalid state.
It's even weirder than I thought, this:

import std.stdio,
        std.typecons;
class A {
	int b;
	~this() {
		writeln("Des");
	}
	this(int x) {
		b=x;
		writeln("Cons");
	}
}
auto x() {
	A x = scoped!A(10);
	writeln(x.b);
	writeln("Return x");
	return x;
}
void main() {
	auto tx = x();
	writeln("Return main");
}

Produce output:
Cons
Des
0
Return x
Return main

Which I totally don't understand.