r.prevRune = -1
	var abs int64
	switch whence {
	case io.SeekStart:
		abs = offset
	case io.SeekCurrent:
		abs = r.i + offset
	case io.SeekEnd:
		abs = int64(len(r.s)) + offset
	default:
		return 0, errors.New("bytes.Reader.Seek: invalid whence")
	}
	if abs < 0 {
		return 0, errors.New("bytes.Reader.Seek: negative position")
	}
	r.i = abs
	return abs, nil
}

func OverlayDir(dstRoot, srcRoot string) error {
	dstRoot = filepath.Clean(dstRoot)
	if err := os.MkdirAll(dstRoot, 0777); err != nil {
		return err
	}

	srcRoot, err := filepath.Abs(srcRoot)
	if err != nil {
		return err
	}

	return filepath.Walk(srcRoot, func(srcPath string, info os.FileInfo, err error) error {
		if err != nil || srcPath == srcRoot {
			return err
		}

// Neg sets z = -x and returns z.
func (z *Int) Neg(x *Int) *Int {
	x.doinit()
	z.doinit()
	C.mpz_neg(&z.i[0], &x.i[0])
	return z
}

// Abs sets z to the absolute value of x and returns z.
func (z *Int) Abs(x *Int) *Int {
	x.doinit()
	z.doinit()
	C.mpz_abs(&z.i[0], &x.i[0])
	return z
}

/*
 * functions without a clear receiver
 */

// CmpInt compares x and y. The result is
//

pkg debug/elf, const R_LARCH_ABS64_LO20 = 69 #54222
pkg debug/elf, const R_LARCH_ABS64_LO20 R_LARCH #54222
pkg debug/elf, const R_LARCH_ABS_HI20 = 67 #54222
pkg debug/elf, const R_LARCH_ABS_HI20 R_LARCH #54222
pkg debug/elf, const R_LARCH_ABS_LO12 = 68 #54222
pkg debug/elf, const R_LARCH_ABS_LO12 R_LARCH #54222
pkg debug/elf, const R_LARCH_B16 = 64 #54222
pkg debug/elf, const R_LARCH_B16 R_LARCH #54222

pkg syscall (darwin-arm64), const BIOCVERSION ideal-int
pkg syscall (darwin-arm64), const BPF_A = 16
pkg syscall (darwin-arm64), const BPF_A ideal-int
pkg syscall (darwin-arm64), const BPF_ABS = 32
pkg syscall (darwin-arm64), const BPF_ABS ideal-int
pkg syscall (darwin-arm64), const BPF_ADD = 0
pkg syscall (darwin-arm64), const BPF_ADD ideal-int
pkg syscall (darwin-arm64), const BPF_ALIGNMENT = 4

pkg syscall (freebsd-arm64), const BIOCVERSION ideal-int
pkg syscall (freebsd-arm64), const BPF_A = 16
pkg syscall (freebsd-arm64), const BPF_A ideal-int
pkg syscall (freebsd-arm64), const BPF_ABS = 32
pkg syscall (freebsd-arm64), const BPF_ABS ideal-int
pkg syscall (freebsd-arm64), const BPF_ADD = 0
pkg syscall (freebsd-arm64), const BPF_ADD ideal-int
pkg syscall (freebsd-arm64), const BPF_ALIGNMENT = 8

pkg debug/elf, const SHF_MERGE = 16
pkg debug/elf, const SHF_OS_NONCONFORMING = 256
pkg debug/elf, const SHF_STRINGS = 32
pkg debug/elf, const SHF_TLS = 1024
pkg debug/elf, const SHF_WRITE = 1
pkg debug/elf, const SHN_ABS = 65521
pkg debug/elf, const SHN_COMMON = 65522
pkg debug/elf, const SHN_HIOS = 65343
pkg debug/elf, const SHN_HIPROC = 65311
pkg debug/elf, const SHN_HIRESERVE = 65535
pkg debug/elf, const SHN_LOOS = 65312

pkg sync/atomic, type Pointer[$0 interface{}] struct #50860
pkg sync/atomic, type Uint32 struct #50860
pkg sync/atomic, type Uint64 struct #50860
pkg sync/atomic, type Uintptr struct #50860
pkg time, method (Duration) Abs() Duration #51414
pkg time, method (Time) ZoneBounds() (Time, Time) #50062
pkg crypto/x509, func ParseCRL //deprecated #50674
pkg crypto/x509, func ParseDERCRL //deprecated #50674