str := strings.Repeat("x", 1<<10)
	bs := []byte(str)
	for i := 0; i < b.N; i++ {
		bw := NewWriter(io.Discard)
		bw.Flush()
		bw.WriteByte('a')
		bw.Flush()
		bw.WriteRune('B')
		bw.Flush()
		bw.Write(bs)
		bw.Flush()
		bw.WriteString(str)
		bw.Flush()
	}
}

func BenchmarkWriterFlush(b *testing.B) {
	b.ReportAllocs()
	bw := NewWriter(io.Discard)

	fmt.Fprint(w, "Hello, ")
	fmt.Fprint(w, "world!")
	w.Flush() // Don't forget to flush!
	// Output: Hello, world!
}

func ExampleWriter_AvailableBuffer() {
	w := bufio.NewWriter(os.Stdout)
	for _, i := range []int64{1, 2, 3, 4} {
		b := w.AvailableBuffer()
		b = strconv.AppendInt(b, i, 10)
		b = append(b, ' ')
		w.Write(b)
	}
	w.Flush()
	// Output: 1 2 3 4
}

	io.Writer
	fileState

	ReadFrom(io.Reader) (int64, error)
}

// Flush finishes writing the current file's block padding.
// The current file must be fully written before Flush can be called.
//
// This is unnecessary as the next call to [Writer.WriteHeader] or [Writer.Close]
// will implicitly flush out the file's padding.
func (tw *Writer) Flush() error {
	if tw.err != nil {
		return tw.err
	}

package zip

import (
	"compress/flate"
	"errors"
	"io"
	"sync"
)

// A Compressor returns a new compressing writer, writing to w.
// The WriteCloser's Close method must be used to flush pending data to w.
// The Compressor itself must be safe to invoke from multiple goroutines
// simultaneously, but each returned writer will be used only by
// one goroutine at a time.

		// the same list with -gcflags=-spectre=LIST and -asmflags=-spectrre=LIST
	case "all", "ret":
		ctxt.Retpoline = true
	}

	ctxt.Bso = bufio.NewWriter(os.Stdout)
	defer ctxt.Bso.Flush()

	architecture.Init(ctxt)

	// Create object file, write header.
	buf, err := bio.Create(*flags.OutputFile)
	if err != nil {
		log.Fatal(err)
	}
	defer buf.Close()

	if !*flags.SymABIs {

	if err != nil {
		t.Fatal(err)
	}
	if buf.Len() > 0 {
		t.Fatalf("Unexpected %d bytes already in buffer", buf.Len())
	}
	if err := w.Flush(); err != nil {
		t.Fatal(err)
	}
	if buf.Len() == 0 {
		t.Fatal("No bytes written after Flush")
	}
}

func TestWriterDir(t *testing.T) {
	w := NewWriter(io.Discard)
	dw, err := w.Create("dir/")
	if err != nil {
		t.Fatal(err)
	}

	//go:cgo_import_dynamic __libc_start_main __libc_start_main#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic stdout stdout#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic fflush fflush#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic _ _ "libpthread.so.0"
	//go:cgo_import_dynamic _ _ "libc.so.6"

In the end, the compiled Go package, which will eventually be

pkg syscall (netbsd-arm64-cgo), const BPF_X ideal-int
pkg syscall (netbsd-arm64-cgo), const BRKINT = 2
pkg syscall (netbsd-arm64-cgo), const BRKINT ideal-int
pkg syscall (netbsd-arm64-cgo), const CFLUSH = 15
pkg syscall (netbsd-arm64-cgo), const CFLUSH ideal-int
pkg syscall (netbsd-arm64-cgo), const CLOCAL = 32768
pkg syscall (netbsd-arm64-cgo), const CLOCAL ideal-int
pkg syscall (netbsd-arm64-cgo), const CLONE_CSIGNAL = 255

pkg syscall (darwin-arm64), const F_DUPFD_CLOEXEC ideal-int
pkg syscall (darwin-arm64), const F_FINDSIGS = 78
pkg syscall (darwin-arm64), const F_FINDSIGS ideal-int
pkg syscall (darwin-arm64), const F_FLUSH_DATA = 40
pkg syscall (darwin-arm64), const F_FLUSH_DATA ideal-int
pkg syscall (darwin-arm64), const F_FREEZE_FS = 53
pkg syscall (darwin-arm64), const F_FREEZE_FS ideal-int
pkg syscall (darwin-arm64), const F_FULLFSYNC = 51

pkg syscall (freebsd-arm64), const IP_DUMMYNET_DEL = 61
pkg syscall (freebsd-arm64), const IP_DUMMYNET_DEL ideal-int
pkg syscall (freebsd-arm64), const IP_DUMMYNET_FLUSH = 62
pkg syscall (freebsd-arm64), const IP_DUMMYNET_FLUSH ideal-int
pkg syscall (freebsd-arm64), const IP_DUMMYNET_GET = 64
pkg syscall (freebsd-arm64), const IP_DUMMYNET_GET ideal-int
pkg syscall (freebsd-arm64), const IP_DUMMYNET3 = 49