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")

pkg reflect, type Type interface, MethodByName(string) (Method, bool)
pkg reflect, type Type interface, Name() string
pkg reflect, type Type interface, NumField() int
pkg reflect, type Type interface, NumIn() int
pkg reflect, type Type interface, NumMethod() int
pkg reflect, type Type interface, NumOut() int
pkg reflect, type Type interface, Out(int) Type
pkg reflect, type Type interface, PkgPath() string