func isEphemeralError(err error) bool {
	var errno syscall.Errno
	if errors.As(err, &errno) {
		switch errno {
		case syscall.ERROR_ACCESS_DENIED,
			syscall.ERROR_FILE_NOT_FOUND,
			windows.ERROR_SHARING_VIOLATION:
			return true
		}
	}
	return false

		if err := fs.saveInfoFromPath(name); err != nil {
			return nil, err
		}
		return fs, nil
	}

	// GetFileAttributesEx fails with ERROR_SHARING_VIOLATION error for
	// files like c:\pagefile.sys. Use FindFirstFile for such files.
	if err == windows.ERROR_SHARING_VIOLATION {
		var fd syscall.Win32finddata
		sh, err := syscall.FindFirstFile(namep, &fd)
		if err != nil {

		if unwrapped == nil {
			break
		}
		err = unwrapped
	}
	if err == syscall.ERROR_ACCESS_DENIED {
		return true // Observed in https://go.dev/issue/50051.
	}
	if err == windows.ERROR_SHARING_VIOLATION {
		return true // Observed in https://go.dev/issue/51442.
	}
	return false
}

// highPrecisionTime represents a single point in time with query performance counter.

// in this package attempt to mitigate.
//
// Errors considered ephemeral include:
//   - syscall.ERROR_ACCESS_DENIED
//   - syscall.ERROR_FILE_NOT_FOUND
//   - internal/syscall/windows.ERROR_SHARING_VIOLATION
//
// This set may be expanded in the future; programs must not rely on the
// non-ephemerality of any given error.
func IsEphemeralError(err error) bool {
	return isEphemeralError(err)

		end = unsafe.Pointer(uintptr(end) + unsafe.Sizeof(*p))
		n++
	}
	return syscall.UTF16ToString(unsafe.Slice(p, n))
}

const (
	ERROR_BAD_LENGTH             syscall.Errno = 24
	ERROR_SHARING_VIOLATION      syscall.Errno = 32
	ERROR_LOCK_VIOLATION         syscall.Errno = 33
	ERROR_NOT_SUPPORTED          syscall.Errno = 50
	ERROR_CALL_NOT_IMPLEMENTED   syscall.Errno = 120
	ERROR_INVALID_NAME           syscall.Errno = 123

	if err != nil {
		t.Fatal(err)
	}
	newpath := filepath.Join(tmpdir, "dir1")
	err = os.Rename(dir, newpath)
	if err == nil || !errors.Is(err, windows.ERROR_SHARING_VIOLATION) {
		f.Close()
		t.Fatalf("Rename(%q, %q) = %v; want windows.ERROR_SHARING_VIOLATION", dir, newpath, err)
	}
	f.Close()
	err = os.Rename(dir, newpath)
	if err != nil {
		t.Error(err)
	}
}

	ERROR_READ_FAULT                                                          syscall.Errno = 30
	ERROR_GEN_FAILURE                                                         syscall.Errno = 31
	ERROR_SHARING_VIOLATION                                                   syscall.Errno = 32
	ERROR_LOCK_VIOLATION                                                      syscall.Errno = 33