Function literals -- strange behavior

[Justin]

I recently discovered D's function literals and wrote a small test to explore them. The following code prints out a 15, then a 0. It seems to me that the second should be 64 and not 0. Can anyone explain what I'm doing wrong?

module functionliteral;
import std.stdio;

static void main() {

	int[] values = [1,2,4,8];
	writefln(Reduce(values, function int(int x, int y) { return x + y; }));
	writefln(Reduce(values, function int(int x, int y) { return x * y; }));
}

static int Reduce(int[] values, int function(int x, int y) operation) {
	int total;
	foreach (int v; values)
		total = operation(total,v);
	return total;
}