tests := []struct {
		desc string
		a    string
		b    string
		mask string
		want any
	}{
		{
			desc: "ignore masked",
			a: `
ak: av
bk:
  b1k: b1v
  b2k: b2v
`,
			b: `
ak: av
bk:
  b1k: b1v-changed
  b2k: b2v-changed
`,
			mask: `
bk:
  b1k: ignored
  b2k: ignored
`,
			want: ``,
		},
		{

	SYS_PPOLL          = 109 // { int sys_ppoll(struct pollfd *fds, u_int nfds, const struct timespec *ts, const sigset_t *mask); }
	SYS_PSELECT        = 110 // { int sys_pselect(int nd, fd_set *in, fd_set *ou, fd_set *ex, const struct timespec *ts, const sigset_t *mask); }
	SYS_SIGSUSPEND     = 111 // { int sys_sigsuspend(int mask); }
	SYS_SENDSYSLOG     = 112 // { int sys_sendsyslog(const char *buf, size_t nbyte, int flags); }

	m := bucketMask(h.B)
	b := (*bmap)(add(h.buckets, (hash&m)*uintptr(t.BucketSize)))
	if c := h.oldbuckets; c != nil {
		if !h.sameSizeGrow() {
			// There used to be half as many buckets; mask down one more power of two.
			m >>= 1
		}
		oldb := (*bmap)(add(c, (hash&m)*uintptr(t.BucketSize)))
		if !evacuated(oldb) {
			b = oldb
		}
	}
	top := tophash(hash)
	for ; b != nil; b = b.overflow(t) {

		requestedUsage := quota.Mask(deltaUsage, hardResources)
		newUsage := quota.Add(resourceQuota.Status.Used, requestedUsage)
		maskedNewUsage := quota.Mask(newUsage, quota.ResourceNames(requestedUsage))

		if allowed, exceeded := quota.LessThanOrEqual(maskedNewUsage, resourceQuota.Status.Hard); !allowed {
			failedRequestedUsage := quota.Mask(requestedUsage, exceeded)

	Code uint16
	Jt   uint8
	Jf   uint8
	K    uint32
}

type SockFprog struct {
	Len    uint16
	_      [6]byte
	Filter *SockFilter
}

type InotifyEvent struct {
	Wd     int32
	Mask   uint32
	Cookie uint32
	Len    uint32
}

const SizeofInotifyEvent = 0x10

type PtraceRegs struct {
	Psw                      PtracePsw
	Gprs                     [16]uint64

		u[i] = ringDecodeAndDecompress10(b)
	}

	b := (*[encodingSize4]byte)(c[encodingSize10*k:])
	v := ringDecodeAndDecompress4(b)

	var mask nttElement // s⊺ ◦ NTT(u)
	for i := range dx.s {
		mask = polyAdd(mask, nttMul(dx.s[i], ntt(u[i])))
	}
	w := polySub(v, inverseNTT(mask))

	return ringCompressAndEncode1(nil, w)
}

// fieldElement is an integer modulo q, an element of ℤ_q. It is always reduced.

	"unsafe"
)

var _ syscall.Errno

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func fanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname *byte) (err error) {
	_, _, e1 := Syscall6(SYS_FANOTIFY_MARK, uintptr(fd), uintptr(flags), uintptr(mask), uintptr(mask>>32), uintptr(dirFd), uintptr(unsafe.Pointer(pathname)))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

	}

	// Element is small with pointer mask; use as literal bits.
	ptrs := typ.PtrBytes / goarch.PtrSize
	mask := typ.GcSlice(0, (ptrs+7)/8)

	// Emit 120-bit chunks of full bytes (max is 127 but we avoid using partial bytes).
	for ; ptrs > 120; ptrs -= 120 {
		dst = append(dst, 120)
		dst = append(dst, mask[:15]...)
		mask = mask[15:]
	}

	dst = append(dst, byte(ptrs))

         <match value="0x00" type="string" mask="0xF8" offset="5"/>
         <match value="0x08" type="string" mask="0xF8" offset="5"/>
         <match value="0x10" type="string" mask="0xF8" offset="5"/>
         <match value="0x18" type="string" mask="0xF8" offset="5"/>
         <match value="0x20" type="string" mask="0xF8" offset="5"/>
         <match value="0x28" type="string" mask="0xF8" offset="5"/>

        return false;
      }

      int longIndex = (int) (bitIndex >>> LONG_ADDRESSABLE_BITS);
      long mask = 1L << bitIndex; // only cares about low 6 bits of bitIndex

      long oldValue;
      long newValue;
      do {
        oldValue = data.get(longIndex);
        newValue = oldValue | mask;
        if (oldValue == newValue) {
          return false;
        }