import std.algorithm;

import std.range;

​

struct S

{

    int x;

    int opCmp(const(S) other) const {

        import std.stdio;

        writeln("comparing ", x, " to ", other.x);

        if(other.x > x) return -1;

        return other.x < x;

    }

}

​

void main()

{

    [S(1),S(2),S(3),S(4),S(5),S(6)].assumeSorted.find(S(3));

}