}

func (v *Element) fromDecimal(s string) *Element {
	n, ok := new(big.Int).SetString(s, 10)
	if !ok {
		panic("not a valid decimal: " + s)
	}
	return v.fromBig(n)
}

// toBig returns v as a big.Int.
func (v *Element) toBig() *big.Int {
	buf := v.Bytes()

	words := make([]big.Word, 32*8/bits.UintSize)
	for n := range words {
		for i := 0; i < bits.UintSize; i += 8 {
			if len(buf) == 0 {
				break

			return bad("func must be func(yield func(...) bool): wrong argument count")
		case toSig(typ.Params().At(0).Type()) == nil:
			return bad("func must be func(yield func(...) bool): argument is not func")
		case typ.Results().Len() != 0:
			return bad("func must be func(yield func(...) bool): unexpected results")
		}
		cb := toSig(typ.Params().At(0).Type())
		assert(cb.Recv() == nil)
		switch {

			return bad("func must be func(yield func(...) bool): wrong argument count")
		case toSig(typ.Params().At(0).Type()) == nil:
			return bad("func must be func(yield func(...) bool): argument is not func")
		case typ.Results().Len() != 0:
			return bad("func must be func(yield func(...) bool): unexpected results")
		}
		cb := toSig(typ.Params().At(0).Type())
		assert(cb.Recv() == nil)
		switch {