// 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
}

### Iterators

The new [iter] package provides the basic definitions for working with
user-defined iterators.

The [slices] package adds several functions that work with iterators:
- [All](/pkg/slices#All) returns an iterator over slice indexes and values.
- [Values](/pkg/slices#Values) returns an iterator over slice elements.
- [Backward](/pkg/slices#Backward) returns an iterator that loops over
  a slice backward.

pkg maps, func Collect[$0 comparable, $1 interface{}](iter.Seq2[$0, $1]) map[$0]$1 #61900
pkg maps, func Insert[$0 interface{ ~map[$1]$2 }, $1 comparable, $2 interface{}]($0, iter.Seq2[$1, $2]) #61900
pkg maps, func Keys[$0 interface{ ~map[$1]$2 }, $1 comparable, $2 interface{}]($0) iter.Seq[$1] #61900
pkg maps, func Values[$0 interface{ ~map[$1]$2 }, $1 comparable, $2 interface{}]($0) iter.Seq[$2] #61900

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

// Linkname coroswitch is not allowed, even if iter.Pull
// is instantiated in the same package.

package main

import (
	"iter"
	"unsafe"
)

func seq(yield func(int) bool) {
	yield(123)
}

func main() {
	next, stop := iter.Pull(seq)
	next()
	stop()
	coroswitch(nil)
}

//go:linkname coroswitch runtime.coroswitch

<!-- see ../../3-iter.md -->...

		if e := v.Index(a.iter.index); e.IsValid() {
			x = e.Interface().(ast.Node)
		}

		a.iter.step = 1
		a.apply(parent, name, &a.iter, x)
		a.iter.index += a.iter.step
	}
	a.iter = saved

<!-- see ../../3-iter.md -->...

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

// Use of public API is ok.

package main

import (
	"iter"
	"unique"
)

func seq(yield func(int) bool) {
	yield(123)
}

var s = "hello"

func main() {
	h := unique.Make(s)
	next, stop := iter.Pull(seq)
	defer stop()
	println(h.Value())
	println(next())
	println(next())

<!-- see ../../3-iter.md -->...

<!-- see ../../3-iter.md -->...