Is this a bug?

[Sean Eskapp]

This code works fine:

        int[] arr = [ 1, 2, 3, 4, 5 ];
        auto myMax = function int(int a, int b) { return (a > b) ? a : b; };
        auto biggest = reduce!(myMax)(arr);

But passing the function literal directly to reduce causes an error. Is this
intentional?