forward range properties with alias this - how?

[Ivan Kazmenko via Digitalmars-d-learn]

Hello,

I wrap an array into a struct.  Then I use alias this to expose 
the array functionality.  Sadly, range properties of the array 
are not forwarded, and so I can't use the struct as an array with 
functions from std.algorithm and std.range.

-----
import std.range, std.stdio;
struct S {
	int[] contents;
	alias contents this;
}
void main() {
	S s;
	writeln(hasSlicing!(S)); // false
}
-----

I would like to be able to do that, however.

1. Why exactly hasSlicing (et al.) does not check the alias 
this-ed array when it checks the struct?

2. What should I do?

The solution I can think of is to insert the 3-6 range functions 
which forward the functionality to the underlying array, perhaps 
as a mixin.

Ivan Kazmenko.