typ := TypeOf(f)
	if typ.NumIn() == 2 && typ.In(0) == TypeOf(int(0)) {
		sl := typ.In(1)
		if sl.Kind() == Slice {
			if sl.Elem() == TypeOf(0.0) {
				// ok
				return
			}
		}
	}

	// Failed
	t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float64")
	s := fmt.Sprintf("have NumIn() = %d", typ.NumIn())
	for i := 0; i < typ.NumIn(); i++ {

		fn = *(*unsafe.Pointer)(v.ptr)
	} else {
		fn = v.ptr
	}

	if fn == nil {
		panic("reflect.Value.Call: call of nil function")
	}

	isSlice := op == "CallSlice"
	n := t.NumIn()
	isVariadic := t.IsVariadic()
	if isSlice {
		if !isVariadic {
			panic("reflect: CallSlice of non-variadic function")
		}
		if len(in) < n {
			panic("reflect: CallSlice with too few input arguments")