a[2] = i2tor(3, 2)
		a[3] = i2tor(13, 6)
		a[4] = i2tor(73, 24)
		a[5] = i2tor(167, 40)
		a[6] = i2tor(4051, 720)
		a[7] = i2tor(37633, 5040)
		a[8] = i2tor(43817, 4480)
		a[9] = i2tor(4596553, 362880)
		checka(e, a, "Exp") // 1 1 3/2 13/6 73/24
		at := Integ(zero, MonSubst(Ones, neg(one), 2))
		for c, i := 1, 0; i < N; i++ {
			if i%2 == 0 {
				a[i] = zero
			} else {
				a[i] = i2tor(int64(c), int64(i))

	if s != "hello" {
		panic("s")
	}

	m := map[string]float64{"one": 1.0, "two": 2.0, "pi": 22. / 7.}
	if len(m) != 3 {
		panic("m")
	}

	eq([]*R{itor(0), itor(1), itor(2), itor(3), itor(4), itor(5)})
	eq([]*R{{0}, {1}, {2}, {3}, {4}, {5}})

	p1 := NewP(1, 2)
	p2 := NewP(1, 2)
	if p1 == p2 {
		panic("NewP")
	}

		a[2] = i2tor(3, 2)
		a[3] = i2tor(13, 6)
		a[4] = i2tor(73, 24)
		a[5] = i2tor(167, 40)
		a[6] = i2tor(4051, 720)
		a[7] = i2tor(37633, 5040)
		a[8] = i2tor(43817, 4480)
		a[9] = i2tor(4596553, 362880)
		checka(e, a, "Exp") // 1 1 3/2 13/6 73/24
		at := Integ(zero, MonSubst(Ones, neg(one), 2))
		for c, i := 1, 0; i < N; i++ {
			if i%2 == 0 {
				a[i] = zero
			} else {
				a[i] = i2tor(int64(c), int64(i))

func newFloat() *big.Float { return new(big.Float).SetPrec(prec) }

//go:noinline
//go:registerparams
func itor(x intVal) ratVal       { return ratVal{nil} }

//go:noinline
//go:registerparams
func itof(x intVal) floatVal     { return floatVal{nil} }
func rtof(x ratVal) floatVal     { return floatVal{newFloat().SetRat(x.val)} }

type Value interface {
	String() string
}

func i64tor(x int64Val) ratVal   { return ratVal{newRat().SetInt64(int64(x))} }
func i64tof(x int64Val) floatVal { return floatVal{newFloat().SetInt64(int64(x))} }
func itor(x intVal) ratVal       { return ratVal{newRat().SetInt(x.val)} }
func itof(x intVal) floatVal     { return floatVal{newFloat().SetInt(x.val)} }
func rtof(x ratVal) floatVal     { return floatVal{newFloat().SetRat(x.val)} }

// and return that.
func (i *Iter) returnSlice(a, b int) []byte {
	if i.rb.src.bytes == nil {
		return i.buf[:copy(i.buf[:], i.rb.src.str[a:b])]
	}
	return i.rb.src.bytes[a:b]
}

// Pos returns the byte position at which the next call to Next will commence processing.
func (i *Iter) Pos() int {
	return i.p
}

func (i *Iter) setDone() {
	i.next = nextDone
	i.p = i.rb.nsrc
}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Simple conversions to avoid depending on strconv.

package itoa

// Itoa converts val to a decimal string.
func Itoa(val int) string {
	if val < 0 {
		return "-" + Uitoa(uint(-val))
	}
	return Uitoa(uint(val))
}

// Uitoa converts val to a decimal string.
func Uitoa(val uint) string {

// license that can be found in the LICENSE file.

package maps

import "iter"

// All returns an iterator over key-value pairs from m.
// The iteration order is not specified and is not guaranteed
// to be the same from one call to the next.
func All[Map ~map[K]V, K comparable, V any](m Map) iter.Seq2[K, V] {
	return func(yield func(K, V) bool) {
		for k, v := range m {
			if !yield(k, v) {
				return

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package reflect

import "iter"

func rangeNum[T int8 | int16 | int32 | int64 | int |
	uint8 | uint16 | uint32 | uint64 | uint |
	uintptr, N int64 | uint64](v N) iter.Seq[Value] {
	return func(yield func(v Value) bool) {
		// cannot use range T(v) because no core type.
		for i := T(0); i < T(v); i++ {

// license that can be found in the LICENSE file.

package slices

import (
	"cmp"
	"iter"
)

// All returns an iterator over index-value pairs in the slice.
// The indexes range in the usual order, from 0 through len(s)-1.
func All[Slice ~[]E, E any](s Slice) iter.Seq2[int, E] {
	return func(yield func(int, E) bool) {
		for i, v := range s {
			if !yield(i, v) {
				return
			}
		}