double[] a=[3.0,4,7,11,3,2,5];
auto ret=reduce!("a+a","a+b*b")(0.0,0.0,a);

phobos2Ex.d(13): Error: template std.algorithm.Reduce!("a+a","a+b*b").reduce(E,Range) does not match any function template declaration
phobos2Ex.d(13): Error: template std.algorithm.Reduce!("a+a","a+b*b").reduce(E,Range) cannot deduce template function from argument types !()(double,double,double[])
*** Errors occurred during this build ***
What's wrong here?Help.

It can compile if import std.typecons and modify as below:

import std.typecons;
import std.algorithm;

void main()
{
  double[] a=[3.0,4,7,11,3,2,5];
  auto ret=reduce!("a+b","a+b*b")(tuple(0.0,0.0),a);
}
Here a explicit tuple is needed.