== Quote from Walter Bright (newshou...@digitalmars.com)'s article
> This works:
> import std.stdio;
> import std.algorithm;
> alias reduce!"a+b" sum;
> auto sumOfSquares( R )( R range ) {
> return sum( map!"a*a"( range ) );
> }
> void main()
> {
> writeln(sumOfSquares([1,2,3]));
> }But then this doesn't: int[] xs = []; writeln(sum(xs)); but mathematically the sum is well-defined as 0 (and the product as 1).
