gran := scenario.gran
		tag := mode + "_" + gran
		incfg = writePkgConfig(t, instdira, tag, ppath, pname, gran, "")
		ofs, outcfg, _ := runPkgCover(t, instdira, tag, incfg, mode,
			apkgfiles, false)
		t.Logf("outfiles: %+v\n", ofs)

		// Run the compiler on the files to make sure the result is
		// buildable.
		bargs := []string{"tool", "compile", "-p", "a", "-coveragecfg", outcfg}
		bargs = append(bargs, ofs...)

			before = ""
		}
		switch verb {
		default:
			log.Fatalf("%s:%d: unknown directive %q", file, lineNum, verb)
		case "packagefile":
			if before == "" || after == "" {
				log.Fatalf(`%s:%d: invalid packagefile: syntax is "packagefile path=filename"`, file, lineNum)
			}
			ctxt.PackageFile[before] = after
		case "packageshlib":
			if before == "" || after == "" {

	}
	diff := diff.Diff(readmePath, old, "readmeTmpl", buf.Bytes())
	if diff == nil {
		t.Logf("%s is up to date.", readmePath)
		return
	}

	if *fixReadme {
		if err := os.WriteFile(readmePath, buf.Bytes(), 0666); err != nil {
			t.Fatal(err)
		}
		t.Logf("wrote %d bytes to %s", buf.Len(), readmePath)
	} else {
		t.Logf("\n%s", diff)
		t.Errorf("%s is stale. To update, run 'go generate cmd/go'.", readmePath)
	}
}

// the external linker be used to complete the link.
func mustLinkExternal(ctxt *Link) (res bool, reason string) {
	if ctxt.Debugvlog > 1 {
		defer func() {
			if res {
				ctxt.Logf("external linking is forced by: %s\n", reason)
			}
		}()
	}

	if platform.MustLinkExternal(buildcfg.GOOS, buildcfg.GOARCH, false) {

		if !got[want] {
			t.Errorf("%q is no longer inlinable", want)
			continue
		}
		delete(got, want)
	}
	for sym := range got {
		if strings.Contains(sym, ".func") {
			continue
		}
		t.Logf("not in expected set, but also inlinable: %q", sym)

	}

	// correct even in the non-optimized version.
	cmd := testenv.CleanCmdEnv(testenv.Command(t, testenv.GoToolPath(t), "test", "."))
	cmd.Dir = dir
	b, err := cmd.CombinedOutput()
	t.Logf("Test without PGO:\n%s", b)
	if err != nil {
		t.Fatalf("Test failed without PGO: %v", err)
	}

	// Build the test with the profile.
	pprof := filepath.Join(dir, pgoProfileName)

	r := &Resolver{
		PreferGo: true,
		Dial: newResolverDialFunc(&resolverDialHandler{
			StartDial: func(network, address string) error {
				t.Logf("StartDial(%q, %q) ...", network, address)
				return nil
			},
			Question: func(h dnsmessage.Header, q dnsmessage.Question) {
				t.Logf("Header: %+v for %q (type=%v, class=%v)", h,
					q.Name.String(), q.Type, q.Class)
			},

	f.Add(math.Float64bits(math.Inf(1)))
	f.Add(math.Float64bits(math.Inf(-1)))

	f.Fuzz(func(t *testing.T, u1 uint64) {
		x1 := math.Float64frombits(u1)

		b := marshalCorpusFile(x1)
		t.Logf("marshaled math.Float64frombits(0x%x):\n%s", u1, b)

		xs, err := unmarshalCorpusFile(b)
		if err != nil {
			t.Fatal(err)
		}
		if len(xs) != 1 {
			t.Fatalf("unmarshaled %d values", len(xs))
		}

	if wantAccept4 != gotAccept4 {
		t.Fatalf("SupportAccept4, got %t; want %t", gotAccept4, wantAccept4)
	}

	// Test that the version returned by KernelVersion matches expectations.
	major, minor := unix.KernelVersion()
	t.Logf("Kernel version: %d.%d", major, minor)
	if runtime.GOOS == "illumos" {
		if gotSock && gotAccept4 && (major < 5 || (major == 5 && minor < 11)) {

func TestIPConnLocalName(t *testing.T) {
	for _, tt := range ipConnLocalNameTests {
		if !testableNetwork(tt.net) {
			t.Logf("skipping %s test", tt.net)
			continue
		}
		c, err := ListenIP(tt.net, tt.laddr)
		if testenv.SyscallIsNotSupported(err) {
			// May be inside a container that disallows creating a socket.
			t.Logf("skipping %s test: %v", tt.net, err)
			continue
		} else if err != nil {
			t.Fatal(err)
		}