// the executable.
	cmd = testenv.Command(t, gotool, "tool", "nm", dest)
	if output, err = cmd.CombinedOutput(); err != nil {
		t.Fatalf("Failed: %v:\nOut: %s\n", err, output)
	}
	// Look for shape-based instantiation of Sort, but ignore any extra wrapper
	// ending in "-tramp" (which are created on riscv).
	re := regexp.MustCompile(`\bSort\[.*shape.*\][^-]`)
	r := re.FindAllIndex(output, -1)
	if len(r) != 1 {

	pprofFile *os.File
}

type mark struct {
	name              string
	startM, endM, gcM runtime.MemStats
	startT, endT      time.Time
}

// New creates a new Metrics object.
//
// Typical usage should look like:
//
//	func main() {
//	  filename := "" // Set to enable per-phase pprof file output.
//	  bench := benchmark.New(benchmark.GC, filename)
//	  defer bench.Report(os.Stdout)
//	  // etc
//	  bench.Start("foo")

		if eltType != nil {
			var ktyp reflect.Value
			if keyType != nil {
				ktyp = reflect.ValueOf(keyType)
			}
			typ := reflect.ValueOf(eltType)
			for i, x := range outer.Elts {
				px := &outer.Elts[i]
				// look at value of indexed/named elements
				if t, ok := x.(*ast.KeyValueExpr); ok {
					if keyType != nil {
						s.simplifyLiteral(ktyp, keyType, t.Key, &t.Key)
					}
					x = t.Value
					px = &t.Value
				}

	// If cgo is enabled, enforce that cgo commands invoked by cmd/fix
	// do not fail during testing.
	if testenv.HasCGO() {
		testenv.MustHaveGoBuild(t) // Really just 'go tool cgo', but close enough.

		// The reportCgoError hook is global, so we can't set it per-test
		// if we want to be able to run those tests in parallel.
		// Instead, simply set it to panic on error: the goroutine dump
		// from the panic should help us determine which test failed.

	// nm holds an addr2Liner using nm tool. Certain versions of addr2line
	// produce incomplete names due to
	// https://sourceware.org/bugzilla/show_bug.cgi?id=17541. As a workaround,
	// the names from nm are used when they look more complete. See addrInfo()
	// code below for the exact heuristic.
	nm *addr2LinerNM
}

// lineReaderWriter is an interface to abstract the I/O to an addr2line

	// exclude them if these strings are not at the beginning,
	// and only if we have at least one error already reported.
	check := err.check
	if check.firstErr != nil {
		// It is sufficient to look at the first sub-error only.
		msg := err.desc[0].msg
		if strings.Index(msg, "invalid operand") > 0 || strings.Index(msg, "invalid type") > 0 {
			return
		}
	}

	if check.conf.Trace {

	// first built).
	if i >= len(b.Values)-1 {
		return i
	}
	// Skip the likely-ephemeral/fragile opcodes expected to vanish in a rewrite.
	if !isPoorStatementOp(v.Op) {
		return i
	}
	// Look ahead to see what the line number is on the next thing that could be a boundary.
	for j := i + 1; j < len(b.Values); j++ {
		u := b.Values[j]
		if u.Pos.IsStmt() == src.PosNotStmt { // ignore non-statements
			continue
		}

		if err != nil {
			return nil, err
		}
		f.sym = sym
	}
	var out []*driver.Sym
	for _, s := range f.sym {
		// Ignore a symbol with address 0 and size 0.
		// An ELF STT_FILE symbol will look like that.
		if s.Addr == 0 && s.Size == 0 {
			continue
		}
		if (r == nil || r.MatchString(s.Name)) && (addr == 0 || s.Addr <= addr && addr < s.Addr+uint64(s.Size)) {
			out = append(out, &driver.Sym{

// if the type is "indirectly" converted to an interface
// using reflection with a method descriptor as intermediate.
// However, it uses MethodByName() with a constant name of
// a method to look up. This does not disable the DCE like
// Method(0) does.

package main

import "reflect"

type S int

func (s S) M() { println("S.M") }

type I interface{ M() }

type T float64

// to EqualFold. Note that strings.ToUpper and strings.ToLower
// do not have the desired property in some corner cases.
func ToFold(s string) string {
	// Fast path: all ASCII, no upper case.
	// Most paths look like this already.
	for i := 0; i < len(s); i++ {
		c := s[i]
		if c >= utf8.RuneSelf || 'A' <= c && c <= 'Z' {
			goto Slow
		}
	}
	return s

Slow:
	var b strings.Builder
	for _, r := range s {