`go:nowritebarrierrec` function and produces an error if it encounters
a function containing a write barrier. This flood stops at
`go:yeswritebarrierrec` functions.

`go:nowritebarrierrec` is used in the implementation of the write
barrier to prevent infinite loops.

Both directives are used in the scheduler. The write barrier requires
an active P (`getg().m.p != nil`) and scheduler code often runs

func (t *Signature) Underlying() Type { return t }
func (t *Signature) String() string   { return TypeString(t, nil) }

// ----------------------------------------------------------------------------
// Implementation

// funcType type-checks a function or method type.
func (check *Checker) funcType(sig *Signature, recvPar *ast.FieldList, ftyp *ast.FuncType) {
	check.openScope(ftyp, "function")
	check.scope.isFunc = true

// Appendix A of FIPS 197: Key expansion examples
type KeyTest struct {
	key []byte
	enc []uint32
	dec []uint32 // decryption expansion; not in FIPS 197, computed from C implementation.
}

var keyTests = []KeyTest{
	{
		// A.1.  Expansion of a 128-bit Cipher Key
		[]byte{0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c},
		[]uint32{

// but it is also input to mksyscall,
// which parses the //sys lines and generates system call stubs.
// Note that sometimes we use a lowercase //sys name and wrap
// it in our own nicer implementation, either here or in
// syscall_bsd.go or syscall_unix.go.

package unix

import (
	"syscall"
	"unsafe"
)

// SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets.

	0x0000000080000001,
	0x8000000080008008,
}

// keccakF1600 applies the Keccak permutation to a 1600b-wide
// state represented as a slice of 25 uint64s.
func keccakF1600(a *[25]uint64) {
	// Implementation translated from Keccak-inplace.c
	// in the keccak reference code.
	var t, bc0, bc1, bc2, bc3, bc4, d0, d1, d2, d3, d4 uint64

	for i := 0; i < 24; i += 4 {
		// Combines the 5 steps in each round into 2 steps.

// net.Listener (if there is one), and should not be nil.
type MakePipe func() (c1, c2 net.Conn, stop func(), err error)

// TestConn tests that a net.Conn implementation properly satisfies the interface.
// The tests should not produce any false positives, but may experience
// false negatives. Thus, some issues may only be detected when the test is

		// first (or following the last) declaration in the file.
		// The result nonetheless always includes the ast.File.
		path = append(path, root)
	}

	return
}

// tokenNode is a dummy implementation of ast.Node for a single token.
// They are used transiently by PathEnclosingInterval but never escape
// this package.
type tokenNode struct {
	pos token.Pos
	end token.Pos
}

}

func iop(i *syntax.Inst) syntax.InstOp {
	op := i.Op
	switch op {
	case syntax.InstRune1, syntax.InstRuneAny, syntax.InstRuneAnyNotNL:
		op = syntax.InstRune
	}
	return op
}

// Sparse Array implementation is used as a queueOnePass.
type queueOnePass struct {
	sparse          []uint32
	dense           []uint32
	size, nextIndex uint32
}

func (q *queueOnePass) empty() bool {
	return q.nextIndex >= q.size

	// called without any call to ModifyResponse.
	//
	// If ModifyResponse returns an error, ErrorHandler is called
	// with its error value. If ErrorHandler is nil, its default
	// implementation is used.
	ModifyResponse func(*http.Response) error

	// ErrorHandler is an optional function that handles errors
	// reaching the backend or errors from ModifyResponse.
	//

	GO_ARGS
	JMP	sync∕atomic·CompareAndSwapInt64(SB)

TEXT	sync∕atomic·CompareAndSwapUintptr(SB), NOSPLIT, $0-25
	GO_ARGS
	JMP	sync∕atomic·CompareAndSwapInt64(SB)

// Generic atomic operation implementation.
// AX already contains target function.
TEXT	racecallatomic<>(SB), NOSPLIT|NOFRAME, $0-0
	// Trigger SIGSEGV early.
	MOVQ	16(SP), R12
	MOVBLZX	(R12), R13