// 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
			}
		}
	}
}

// Backward returns an iterator over index-value pairs in the slice,
// traversing it backward. The indexes range from len(s)-1 down to 0.

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.

)

// a bucketMetacache keeps track of all caches generated
// for a bucket.
type bucketMetacache struct {
	// Name of bucket
	bucket string

	// caches indexed by id.
	caches map[string]metacache
	// cache ids indexed by root paths
	cachesRoot map[string][]string `msg:"-"`

	// Internal state
	mu      sync.RWMutex `msg:"-"`
	updated bool         `msg:"-"`
}

type deleteAllStorager interface {

	// Read all.
	ReadAll(ctx context.Context, volume string, path string) (buf []byte, err error)
	GetDiskLoc() (poolIdx, setIdx, diskIdx int) // Retrieve location indexes.

// Size returns the output size of the hash function in bytes.
func (d *state) Size() int { return d.outputLen }

// Reset clears the internal state by zeroing the sponge state and
// the buffer indexes, and setting Sponge.state to absorbing.
func (d *state) Reset() {
	// Zero the permutation's state.
	for i := range d.a {
		d.a[i] = 0
	}
	d.state = spongeAbsorbing
	d.i, d.n = 0, 0
}

type indexValidator func(int) bool

func newCacheInterval(startIndex, endIndex int, indexer indexerFunc, indexValidator indexValidator, locker sync.Locker) *watchCacheInterval {
	return &watchCacheInterval{
		startIndex:     startIndex,
		endIndex:       endIndex,
		indexer:        indexer,
		indexValidator: indexValidator,
		buffer:         &watchCacheIntervalBuffer{buffer: make([]*watchCacheEvent, bufferSize)},

package types2

import (
	"cmd/compile/internal/syntax"
	"fmt"
)

// This file should not be copied to go/types.  See go.dev/issue/67477

// RenameResult takes an array of (result) fields and an index, and if the indexed field
// does not have a name and if the result in the signature also does not have a name,
// then the signature and field are renamed to
//
//	fmt.Sprintf("#rv%d", i+1)`
//

     * phase they want to execute and we can easily determine what lifecycle we need to run.
     *
     * @return A map of lifecycles, indexed on id
     */
    public Map<String, Lifecycle> getPhaseToLifecycleMap() {
        // If people are going to make their own lifecycles then we need to tell people how to namespace them correctly

}

// Lookup returns an unsorted list of at most n indices where the byte string s
// occurs in the indexed data. If n < 0, all occurrences are returned.
// The result is nil if s is empty, s is not found, or n == 0.
// Lookup time is O(log(N)*len(s) + len(result)) where N is the
// size of the indexed data.
func (x *Index) Lookup(s []byte, n int) (result []int) {
	if len(s) > 0 && n != 0 {
		matches := x.lookupAll(s)

	case "$$B\n":
		var exportFormat byte
		if exportFormat, err = buf.ReadByte(); err != nil {
			return
		}
		size--

		// The unified export format starts with a 'u'; the indexed export
		// format starts with an 'i'; and the older binary export format
		// starts with a 'c', 'd', or 'v' (from "version"). Select
		// appropriate importer.
		switch exportFormat {
		case 'u':