Delay: make([]int, 1),
	}
	if err := EncodeAll(io.Discard, g0); err == nil {
		t.Error("expected error from mismatched delay and image slice lengths")
	}

	g1 := &GIF{
		Image:    images,
		Delay:    make([]int, len(images)),
		Disposal: make([]byte, 1),
	}
	for i := range g1.Disposal {
		g1.Disposal[i] = DisposalNone
	}
	if err := EncodeAll(io.Discard, g1); err == nil {

			return n, err
		}
	}
	return
}

// Discard is a [Writer] on which all Write calls succeed
// without doing anything.
var Discard Writer = discard{}

type discard struct{}

// discard implements ReaderFrom as an optimization so Copy to
// io.Discard can avoid doing unnecessary work.
var _ ReaderFrom = discard{}

func (discard) Write(p []byte) (int, error) {
	return len(p), nil
}

func (f *flagVar) Set(value string) error {
	*f = append(*f, value)
	return nil
}

func TestUserDefined(t *testing.T) {
	var flags FlagSet
	flags.Init("test", ContinueOnError)
	flags.SetOutput(io.Discard)
	var v flagVar
	flags.Var(&v, "v", "usage")
	if err := flags.Parse([]string{"-v", "1", "-v", "2", "-v=3"}); err != nil {
		t.Error(err)
	}
	if len(v) != 3 {
		t.Fatal("expected 3 args; got ", len(v))
	}

	binArch := base.Clone()
	binArch.Filter(func(name string) bool {
		// Discard bin/ for now, will add back later.
		if strings.HasPrefix(name, "bin/") {
			return false
		}
		// Discard most of pkg.
		if strings.HasPrefix(name, "pkg/") {
			// Keep pkg/include.
			if strings.HasPrefix(name, "pkg/include/") {
				return true
			}
			// Discard other pkg except pkg/tool.
			if !strings.HasPrefix(name, "pkg/tool/") {

		}
	}()

	wg.Add(1)
	go func() {
		// Connect to the server started two goroutines up and
		// discard any data that it writes.
		defer wg.Done()
		conn, err := Dial("tcp", ln.Addr().String())
		if err != nil {
			t.Error(err)
			return
		}
		defer conn.Close()
		io.Copy(io.Discard, conn)
	}()

	// Wait for the byte to be copied, meaning that sendfile has
	// been called on the pipe.

            value.isMissing -> {
                // Can serialize a fixed value and discard the provider
                // TODO - should preserve information about the source, for diagnostics at execution time
                writeByte(1)
            }

            value.hasFixedValue() && sideEffect == null -> {
                // Can serialize a fixed value and discard the provider

    }

    @Override
    public MutationValidator getValidator() {
        return holder;
    }

    @Override
    public void discardAll() {
        holder.discard();
    }

    private static class MetadataHolder implements MutationValidator {
        @Nullable
        private SoftReference<LocalComponentGraphResolveState> reference;
        @Nullable

// 2. A node with minimum highest priority victim is picked.
// 3. Ties are broken by sum of priorities of all victims.
// 4. If there are still ties, node with the minimum number of victims is picked.
// 5. If there are still ties, node with the latest start time of all highest priority victims is picked.
// 6. If there are still ties, the first such node is picked (sort of randomly).

}

// SiteReplicationDevNull - everything goes to io.Discard
// [POST] /minio/admin/v3/site-replication/devnull
func (a adminAPIHandlers) SiteReplicationDevNull(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	globalSiteNetPerfRX.Connect()
	defer globalSiteNetPerfRX.Disconnect()

	connectTime := time.Now()
	for {
		n, err := io.CopyN(xioutil.Discard, r.Body, 128*humanize.KiByte)

		return bytes.NewBuffer(make([]byte, 0, maxRecordSize))
	},
}

var bufioWriterPool = sync.Pool{
	New: func() interface{} {
		// io.Discard is just used to create the writer. Actual destination
		// writer is set later by Reset() before using it.
		return bufio.NewWriter(xioutil.Discard)
	},
}

// UnmarshalXML - decodes XML data.
func (c *CompressionType) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {