defer chtmpdir(t)()
	const f = "append.txt"
	s := writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
	if s != "new" {
		t.Fatalf("writeFile: have %q want %q", s, "new")
	}
	s = writeFile(t, f, O_APPEND|O_RDWR, "|append")
	if s != "new|append" {
		t.Fatalf("writeFile: have %q want %q", s, "new|append")
	}
	s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "|append")
	if s != "new|append|append" {

    writeFile(getCleanFile("g2", 0), "C")
    writeFile(getCleanFile("g2", 1), "D")
    writeFile(getCleanFile("g2", 1), "D")
    writeFile(cacheDir / "otherFile0", "E")
    writeFile(dir2 / "otherFile1", "F")
  }

  private fun assertGarbageFilesAllDeleted() {
    assertThat(filesystem.exists(getCleanFile("g1", 0))).isFalse()
    assertThat(filesystem.exists(getCleanFile("g1", 1))).isFalse()

	stdlibImportcfgFilenameOnce.Do(func() {
		tmpdir, err := os.MkdirTemp("", "importcfg")
		if err != nil {
			log.Fatal(err)
		}
		filename := filepath.Join(tmpdir, "importcfg")
		err = os.WriteFile(filename, []byte(stdlibImportcfg()), 0644)
		if err != nil {
			log.Fatal(err)
		}
		stdlibImportcfgFilename = filename
	})
	return stdlibImportcfgFilename
}

	os.Setenv("LANG", "C")
	os.Setenv("LANGUAGE", "en_US.UTF8")
	os.Unsetenv("GO111MODULE")
	os.Setenv("GOENV", "off")
	os.Unsetenv("GOFLAGS")
	os.Setenv("GOWORK", "off")

	workdir = xworkdir()
	if err := os.WriteFile(pathf("%s/go.mod", workdir), []byte("module bootstrap"), 0666); err != nil {
		fatalf("cannot write stub go.mod: %s", err)
	}
	xatexit(rmworkdir)

	tooldir = pathf("%s/pkg/tool/%s_%s", goroot, gohostos, gohostarch)

	if err = os.Mkdir(slashpath.Join(permDeniedDir, "mybucket"), 0o775); err != nil {
		t.Fatalf(fmt.Sprintf("Unable to create temporary directory %v. %v", slashpath.Join(permDeniedDir, "mybucket"), err))
	}

	if err = os.WriteFile(slashpath.Join(permDeniedDir, "mybucket", "myobject"), []byte(""), 0o400); err != nil {
		t.Fatalf(fmt.Sprintf("Unable to create file %v. %v", slashpath.Join(permDeniedDir, "mybucket", "myobject"), err))
	}

//sys	readFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = ReadFile
//sys	writeFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = WriteFile
//sys	SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff]

{
  .debug_gdb_scripts BLOCK(__section_alignment__) (NOLOAD) :
  {
    *(.debug_gdb_scripts)
  }
}
INSERT AFTER .debug_types;
`
	err := os.WriteFile(path, []byte(src), 0666)
	if err != nil {
		Errorf(nil, "WriteFile %s failed: %v", name, err)
	}
	return path
}

type machoUpdateFunc func(ctxt *Link, exef *os.File, exem *macho.File, outexe string) error

//sys	readFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = ReadFile
//sys	writeFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = WriteFile
//sys	GetOverlappedResult(handle Handle, overlapped *Overlapped, done *uint32, wait bool) (err error)

func testFileServerImplicitLeadingSlash(t *testing.T, mode testMode) {
	tempDir := t.TempDir()
	if err := os.WriteFile(filepath.Join(tempDir, "foo.txt"), []byte("Hello world"), 0644); err != nil {
		t.Fatalf("WriteFile: %v", err)
	}
	ts := newClientServerTest(t, mode, StripPrefix("/bar/", FileServer(Dir(tempDir)))).ts
	get := func(suffix string) string {

	procWaitForSingleObject                = modkernel32.NewProc("WaitForSingleObject")
	procWriteConsoleW                      = modkernel32.NewProc("WriteConsoleW")
	procWriteFile                          = modkernel32.NewProc("WriteFile")
	procAcceptEx                           = modmswsock.NewProc("AcceptEx")
	procGetAcceptExSockaddrs               = modmswsock.NewProc("GetAcceptExSockaddrs")