ref lost to opDispatch

[Carl Sturtivant]

I ran into the following behavior.

==============================================
void main() {
	int x = 100;

	B().modify( x, 99);
	writeln( x); //still 100

	modify( x, 99);
	writeln( x); //now is 99
}

void modify( ref int x, int y) { x = y; }

struct B {
	void opDispatch(string f, Args...)( Args args) {
		mixin( f~"(args);");
	}
}
==============================================

When dispatched through a general argument tuple, ref is lost and 
the dispatched code therefore does not have the desired side 
effect. Is there anything I can do about this?