// it resumes reading the next one down.
type Stack struct {
	tr []TokenReader
}

// Push adds tr to the top (end) of the input stack. (Popping happens automatically.)
func (s *Stack) Push(tr TokenReader) {
	s.tr = append(s.tr, tr)
}

func (s *Stack) Next() ScanToken {
	tos := s.tr[len(s.tr)-1]
	tok := tos.Next()
	for tok == scanner.EOF && len(s.tr) > 1 {
		tos.Close()

			if (len(sparseMap)%2 == 0 && key != paxGNUSparseOffset) ||
				(len(sparseMap)%2 == 1 && key != paxGNUSparseNumBytes) ||
				strings.Contains(value, ",") {
				return nil, ErrHeader
			}
			sparseMap = append(sparseMap, value)
		default:
			paxHdrs[key] = value
		}
	}
	if len(sparseMap) > 0 {
		paxHdrs[paxGNUSparseMap] = strings.Join(sparseMap, ",")
	}
	return paxHdrs, nil
}

	for len(sa) > 0 && len(sb) > 0 {
		if sa[0] == sb[0] {
			ss = append(ss, identity+sa[0])
		} else {
			ss = append(ss, uniqueA+sa[0])
			ss = append(ss, uniqueB+sb[0])
		}
		sa, sb = sa[1:], sb[1:]
	}
	for len(sa) > 0 {
		ss = append(ss, uniqueA+sa[0])
		sa = sa[1:]
	}
	for len(sb) > 0 {
		ss = append(ss, uniqueB+sb[0])
		sb = sb[1:]
	}
	return strings.Join(ss, "\n")
}

		}
		if !v.wantValid {
			continue
		}
		gotAligned := alignSparseEntries(append([]sparseEntry{}, v.in...), v.size)
		if !equalSparseEntries(gotAligned, v.wantAligned) {
			t.Errorf("test %d, alignSparseEntries():\ngot  %v\nwant %v", i, gotAligned, v.wantAligned)
		}
		gotInverted := invertSparseEntries(append([]sparseEntry{}, v.in...), v.size)
		if !equalSparseEntries(gotInverted, v.wantInverted) {

pkg flag, method (*FlagSet) TextVar(encoding.TextUnmarshaler, string, encoding.TextMarshaler, string) #45754
pkg fmt, func Append([]uint8, ...interface{}) []uint8 #47579
pkg fmt, func Appendf([]uint8, string, ...interface{}) []uint8 #47579
pkg fmt, func Appendln([]uint8, ...interface{}) []uint8 #47579
pkg go/doc, method (*Package) HTML(string) []uint8 #51082
pkg go/doc, method (*Package) Markdown(string) []uint8 #51082

	"cmd/internal/sys"
)

// TODO: configure the architecture

var testOut *strings.Builder // Gathers output when testing.

// append adds the Prog to the end of the program-thus-far.
// If doLabel is set, it also defines the labels collect for this Prog.
func (p *Parser) append(prog *obj.Prog, cond string, doLabel bool) {
	if cond != "" {
		switch p.arch.Family {
		case sys.ARM:
			if !arch.ARMConditionCodes(prog, cond) {

			switch c {
			case '{', '[':
				nest++
			case '}', ']':
				nest--
			case ',':
				buf = append(buf, ',')
				if nest == 0 {
					buf = append(buf, ' ')
				}
				for i+1 < len(printed) && (printed[i+1] == ' ' || printed[i+1] == '\t') {
					i++
				}
				continue
			}
			buf = append(buf, c)
		}

		f := strings.Fields(string(buf))

}

func (p Pair[X1, _]) First() X1 {
	return p.f1
}

func (p Pair[_, X2]) Second() X2 {
	return p.f2
}

// Deprecated: Use something else.
func Clone[S ~[]T, T any](s S) S {
	return append(S(nil), s...)

func Tokenize(str string) []Token {
	t := NewTokenizer("command line", strings.NewReader(str), nil)
	var tokens []Token
	for {
		tok := t.Next()
		if tok == scanner.EOF {
			break
		}
		tokens = append(tokens, Make(tok, t.Text()))
	}
	return tokens

pkg syscall (linux-arm-cgo), const NLMSG_NOOP ideal-int
pkg syscall (linux-arm-cgo), const NLMSG_OVERRUN ideal-int
pkg syscall (linux-arm-cgo), const NLM_F_ACK ideal-int
pkg syscall (linux-arm-cgo), const NLM_F_APPEND ideal-int
pkg syscall (linux-arm-cgo), const NLM_F_ATOMIC ideal-int
pkg syscall (linux-arm-cgo), const NLM_F_CREATE ideal-int
pkg syscall (linux-arm-cgo), const NLM_F_DUMP ideal-int