passing member.member alias to mixin template

[Eric_DD via Digitalmars-d-learn]

I am running into something that seems a bit inconsistent.
When I pass an alias of a member to a mixin it works, but a 
member to member doesn't.

It seems like the alias is evaluated to the last symbol before 
passing it to the mixin.
If that's true, is there a way to defer the evaluation?

Anyway, better look at this code:


*** This works:

struct Array {
	void foo() { writeln("foo"); }
}

mixin template arrayOperations(arrays...) {
	void foo() {
		foreach(ref a; arrays) a.foo();
	}
}

class Thing {
	Array data1;
	Array data2;
	mixin arrayOperations!(data1, data2);
}

int main(string[] argv) {
	new Thing().foo();
	return 0;
}

***

But if I wrap Array in a S, then I get a "need this for data of 
type Array"
Is there a way (without an alias this in S) to get the following 
working?


*** Non working code:

struct Array {
	void foo() { writeln("foo"); }
}

struct S {
	Array data;
}

mixin template arrayOperations(arrays...) {
	void foo() {
		foreach(ref a; arrays) a.foo();    // error: "need this for 
data of type Array"
	}
}

class Thing {
	S s1;
	S s2;
	mixin arrayOperations!(s1.data, s2.data);
}



int main(string[] argv) {
	new Thing().foo();
	return 0;
}