if gp.preemptStop && gp.preempt && gp.stackguard0 == stackPreempt && asyncM == gp.m && asyncM.preemptGen.Load() == asyncGen {
				break
			}

			// Temporarily block state transitions.
			if !castogscanstatus(gp, _Grunning, _Gscanrunning) {
				break
			}

			// Request synchronous preemption.
			gp.preemptStop = true
			gp.preempt = true
			gp.stackguard0 = stackPreempt

	p256PointAddAsm(&t1, &t1, p)
	p256PointAddAsm(&t2, &t2, p)
	precomp[2] = t0 // 3
	precomp[4] = t1 // 5
	precomp[8] = t2 // 9

	p256PointDoubleAsm(&t0, &t0)
	p256PointDoubleAsm(&t1, &t1)
	precomp[5] = t0 // 6
	precomp[9] = t1 // 10

	p256PointAddAsm(&t2, &t0, p)
	p256PointAddAsm(&t1, &t1, p)
	precomp[6] = t2  // 7
	precomp[10] = t1 // 11

	p256PointDoubleAsm(&t0, &t0)

			s.op, s.prec = Geq, precCmp
			s.tok = _Operator
			break
		}
		if s.ch == '>' {
			s.nextch()
			s.op, s.prec = Shr, precMul
			goto assignop
		}
		s.op, s.prec = Gtr, precCmp
		s.tok = _Operator

	case '=':
		s.nextch()
		if s.ch == '=' {
			s.nextch()
			s.op, s.prec = Eql, precCmp
			s.tok = _Operator
			break
		}
		s.tok = _Assign

	case '!':
		s.nextch()

		zheader     = 0x04034b50
	)

	buf := make([]byte, ztailsize)
	if err := preadn(fd, buf, -ztailsize); err != nil || get4(buf) != zecheader {
		return nil, errors.New("corrupt zip file " + zipfile)
	}
	n := get2(buf[10:])
	size := get4(buf[12:])
	off := get4(buf[16:])

	buf = make([]byte, size)
	if err := preadn(fd, buf, off); err != nil {
		return nil, errors.New("corrupt zip file " + zipfile)
	}

	{_Operator, "||", OrOr, precOrOr},

	{_Operator, "&&", AndAnd, precAndAnd},

	{_Operator, "==", Eql, precCmp},
	{_Operator, "!=", Neq, precCmp},
	{_Operator, "<", Lss, precCmp},
	{_Operator, "<=", Leq, precCmp},
	{_Operator, ">", Gtr, precCmp},
	{_Operator, ">=", Geq, precCmp},

	{_Operator, "+", Add, precAdd},
	{_Operator, "-", Sub, precAdd},
	{_Operator, "|", Or, precAdd},

// is unavailable
func (h *HTTPExtender) IsIgnorable() bool {
	return h.ignorable
}

// SupportsPreemption returns true if an extender supports preemption.
// An extender should have preempt verb defined and enabled its own node cache.
func (h *HTTPExtender) SupportsPreemption() bool {
	return len(h.preemptVerb) > 0
}

// multiple main packages.
func recompileForTest(pmain, preal, ptest, pxtest *Package) *PackageError {
	// The "test copy" of preal is ptest.
	// For each package that depends on preal, make a "test copy"
	// that depends on ptest. And so on, up the dependency tree.
	testCopy := map[*Package]*Package{preal: ptest}
	for _, p := range PackageList([]*Package{pmain}) {
		if p == preal {
			continue
		}
		// Copy on write.

	SYS___CLONE              = 287 // { pid_t|sys||__clone(int flags, void *stack); }
	SYS_FKTRACE              = 288 // { int|sys||fktrace(int fd, int ops, int facs, pid_t pid); }
	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }

	SYS___CLONE              = 287 // { pid_t|sys||__clone(int flags, void *stack); }
	SYS_FKTRACE              = 288 // { int|sys||fktrace(int fd, int ops, int facs, pid_t pid); }
	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }

	SYS___CLONE              = 287 // { pid_t|sys||__clone(int flags, void *stack); }
	SYS_FKTRACE              = 288 // { int|sys||fktrace(int fd, int ops, int facs, pid_t pid); }
	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }