static void FoldrExample()
{
var functions = HList.Single <Func <int, int> >(x => x + 1)
.Extend <Func <int, int> >(y => y * 2)
.Extend <Func <string, int> >(z => z.Length);
var comp1 = Apply.Comp <string, int, int>();
var comp0 = Apply.Comp <int, int, int>();
var fold0 = HFoldr.Hfoldr <Unit, Func <int, int> >();
var fold2 = HFoldr.Hfoldr <Unit, Func <int, int>, Func <string, int>,
HCons <Func <int, int>, HCons <Func <int, int>, HNil> >,
Func <int, int>, Func <string, int>,
Apply <Unit, Tuple <Func <string, int>, Func <int, int> >, Func <string, int> >,
HFoldr <Unit, Func <int, int>, HCons <Func <int, int>, HCons <Func <int, int>, HNil> >, Func <int, int> > >(comp1,
HFoldr.Hfoldr <Unit, Func <int, int>, Func <int, int>, HCons <Func <int, int>, HNil>, Func <int, int>, Func <int, int>,
Apply <Unit, Tuple <Func <int, int>, Func <int, int> >, Func <int, int> >,
HFoldr <Unit, Func <int, int>, HCons <Func <int, int>, HNil>, Func <int, int> > >(comp0,
HFoldr.Hfoldr <Unit, Func <int, int>, Func <int, int>, HNil, Func <int, int>, Func <int, int>,
Apply <Unit, Tuple <Func <int, int>, Func <int, int> >, Func <int, int> >,
HFoldr <Unit, Func <int, int>, HNil, Func <int, int> > >(comp0, fold0)));
Func <int, int> id = i => i;
Console.WriteLine(fold2.FoldRight(null, id, functions)("abc"));
}