assertPathError(t, path, err)
}

// Use TempDir (via newFile) to make sure we're on a local file system,
// so that timings are not distorted by latency and caching.
// On NFS, timings can be off due to caching of meta-data on
// NFS servers (Issue 848).
func TestChtimes(t *testing.T) {
	t.Parallel()

	f := newFile("TestChtimes", t)
	defer Remove(f.Name())

	f.Write([]byte("hello, world\n"))

	for i := range fileTests {
		tt := &fileTests[i]

		var f *File
		var err error
		if path.Ext(tt.file) == ".gz" {
			var r io.ReaderAt
			if r, err = decompress(tt.file); err == nil {
				f, err = NewFile(r)
			}
		} else {
			f, err = Open(tt.file)
		}
		if err != nil {
			t.Errorf("cannot open file %s: %v", tt.file, err)
			continue
		}
		defer f.Close()
		if f.FileHeader != tt.hdr {

		v1.AddArg(x)
		v2 := b.NewValue0(v.Pos, OpInt64Hi, typ.UInt32)
		v2.AddArg(y)
		v3 := b.NewValue0(v.Pos, OpSelect1, types.TypeFlags)
		v4 := b.NewValue0(v.Pos, OpAdd32carry, types.NewTuple(typ.UInt32, types.TypeFlags))
		v5 := b.NewValue0(v.Pos, OpInt64Lo, typ.UInt32)
		v5.AddArg(x)
		v6 := b.NewValue0(v.Pos, OpInt64Lo, typ.UInt32)
		v6.AddArg(y)
		v4.AddArg2(v5, v6)
		v3.AddArg(v4)

(AtomicStore8 ptr val mem) => (Select1 (XCHGB <types.NewTuple(typ.UInt8,types.TypeMem)> val ptr mem))
(AtomicStore32 ptr val mem) => (Select1 (XCHGL <types.NewTuple(typ.UInt32,types.TypeMem)> val ptr mem))
(AtomicStore64 ptr val mem) => (Select1 (XCHGQ <types.NewTuple(typ.UInt64,types.TypeMem)> val ptr mem))
(AtomicStorePtrNoWB ptr val mem) => (Select1 (XCHGQ <types.NewTuple(typ.BytePtr,types.TypeMem)> val ptr mem))

// Atomic exchanges.

//
// When hashing a small byte slice or string, a single Write and Read may
// be used:
//
//	// Assume hashfd is already configured using the setup process.
//	hash := os.NewFile(hashfd, "sha1")
//	// Hash an input string and read the results. Each Write discards
//	// previous hash state. Read always reads the current state.
//	b := make([]byte, 20)
//	for i := 0; i < 2; i++ {

				if err != nil {
					t.Fatalf("failed to attach: %v", err)
				}
			}

			parent := filepath.Dir(tc.deviceMountPath)
			filePath := filepath.Join(parent, "newfile")
			if tc.populateDeviceMountPath {
				// We need to create the deviceMountPath before we Mount,
				// so that we can correctly create the file without errors.
				err := os.MkdirAll(tc.deviceMountPath, 0750)

	//
	// It must be possible for importers to construct such invalid interfaces.
	// Previously, this panicked.

	sig1 := NewSignatureType(nil, nil, nil, NewTuple(NewParam(nopos, nil, "", Typ[Int])), nil, false)
	sig2 := NewSignatureType(nil, nil, nil, NewTuple(NewParam(nopos, nil, "", Typ[String])), nil, false)

	methods := []*Func{
		NewFunc(nopos, nil, "M", sig1),
		NewFunc(nopos, nil, "M", sig2),
	}

	//
	// It must be possible for importers to construct such invalid interfaces.
	// Previously, this panicked.

	sig1 := NewSignatureType(nil, nil, nil, NewTuple(NewParam(nopos, nil, "", Typ[Int])), nil, false)
	sig2 := NewSignatureType(nil, nil, nil, NewTuple(NewParam(nopos, nil, "", Typ[String])), nil, false)

	methods := []*Func{
		NewFunc(nopos, nil, "M", sig1),
		NewFunc(nopos, nil, "M", sig2),
	}

// for TestLinuxSendfile.
func TestLinuxSendfileChild(*testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
		return
	}
	defer os.Exit(0)
	fd3 := os.NewFile(3, "ephemeral-port-listener")
	ln, err := net.FileListener(fd3)
	if err != nil {
		panic(err)
	}
	mux := NewServeMux()
	mux.Handle("/", FileServer(Dir(os.TempDir())))

func NewChan(elem *Type, dir ChanDir) *Type {
	t := newType(TCHAN)
	ct := t.chanType()
	ct.Elem = elem
	ct.Dir = dir
	if elem.HasShape() {
		t.SetHasShape(true)
	}
	return t
}

func NewTuple(t1, t2 *Type) *Type {
	t := newType(TTUPLE)
	t.extra.(*Tuple).first = t1
	t.extra.(*Tuple).second = t2
	if t1.HasShape() || t2.HasShape() {
		t.SetHasShape(true)
	}
	return t
}