}

func (w *Walker) emitf(format string, args ...any) {
	f := strings.Join(w.scope, ", ") + ", " + fmt.Sprintf(format, args...)
	if strings.Contains(f, "\n") {
		panic("feature contains newlines: " + f)
	}

	if _, dup := w.features[f]; dup {
		panic("duplicate feature inserted: " + f)
	}
	w.features[f] = true

	if verbose {
		log.Printf("feature: %s", f)
	}
}

// has been uploaded using the S3 singlepart API.
//
// Parts may panic if the ETag is an invalid multipart
// ETag.
func (e ETag) Parts() int {
	if !e.IsMultipart() {
		return 1
	}

	n := bytes.IndexRune(e, '-')
	parts, err := strconv.Atoi(string(e[n+1:]))
	if err != nil {
		panic(err) // malformed ETag
	}
	return parts
}

func (s *Singleton[T]) IsSet() bool {
	select {
	case <-s.set:
		return true
	default:
		return false
	}
}

// Set the value and unblock all Get requests.
// This may only be called once, a second call will panic.
func (s *Singleton[T]) Set(v *T) {
	s.v = v
	close(s.set)

	br := bufio.NewReader(bytes.NewReader(b))
loop:
	for {
		_, err := br.ReadByte()
		switch err {
		case nil:
			continue loop
		case io.EOF:
			break loop
		default:
			panic(err)
		}
	}
}

func BenchmarkScanner(b *testing.B) {
	b.Run("small", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			benchmarkScanner(smallInput)
		}
	})

		dst.KVS = make(jstream.KVS, 0, len(elems.Elements))
	}
	for _, elem := range elems.Elements {
		v, err := sql.IterToValue(elem.Iter)
		if err != nil {
			v, err = elem.Iter.Interface()
			if err != nil {
				panic(err)
			}
		}
		dst.KVS = append(dst.KVS, jstream.KV{
			Key:   elem.Name,
			Value: v,
		})
	}
	return dst, nil
}

// Set - sets the value for a column name.

			t.Fatalf("Test %d: ciphertext mismatch: got %x - want %x", i, key.Ciphertext, test.Key.Ciphertext)
		}
	}
}

func mustDecodeB64(s string) []byte {
	b, err := base64.StdEncoding.DecodeString(s)
	if err != nil {
		panic(err)
	}
	return b

	if b.r > 0 {
		copy(b.buf, b.buf[b.r:b.w])
		b.w -= b.r
		b.r = 0
	}

	if b.w >= len(b.buf) {
		panic("bufio: tried to fill full buffer")
	}

	// Read new data: try a limited number of times.
	for i := maxConsecutiveEmptyReads; i > 0; i-- {
		n, err := b.rd.Read(b.buf[b.w:])
		if n < 0 {
			panic(errNegativeRead)
		}
		b.w += n
		if err != nil {
			b.err = err
			return
		}
		if n > 0 {

// It _doesn't_ connect to the remote endpoint. See Call method to see when the
// connect happens.
func newClient(endpoint string) NetLocker {
	u, err := url.Parse(endpoint)
	if err != nil {
		panic(err)
	}

	tr := &http.Transport{
		Proxy:                 http.ProxyFromEnvironment,
		MaxIdleConnsPerHost:   1024,
		WriteBufferSize:       32 << 10, // 32KiB moving up from 4KiB default

var ErrCritical struct{}

// CriticalIf logs the provided error on the console. It fails the
// current go-routine by causing a `panic(ErrCritical)`.
func CriticalIf(ctx context.Context, err error, errKind ...interface{}) {
	if err != nil {
		LogIf(ctx, "", err, errKind...)
		panic(ErrCritical)
	}
}

// FatalIf is similar to Fatal() but it ignores passed nil error

//
// Buffer panics if it is called after scanning has started.
func (s *Scanner) Buffer(buf []byte, max int) {
	if s.scanCalled {
		panic("Buffer called after Scan")
	}
	s.buf = buf[0:cap(buf)]
	s.maxTokenSize = max
}

// Split sets the split function for the [Scanner].
// The default split function is [ScanLines].
//
// Split panics if it is called after scanning has started.