return Collectors.collectingAndThen(Collectors.toList(), stringList -> {
            if (stringList.isEmpty()) {
                return "";
            }
            if (stringList.size() == 1) {
                return stringList.get(0);
            }
            int bound = stringList.size() - 1;
            return String.join(", ", stringList.subList(0, bound)) + " or " + stringList.get(bound);
        });
    }

	"istio.io/istio/pkg/network"
	"istio.io/istio/pkg/util/protomarshal"
)

// StringList is a list that will be marshaled to a comma separate string in Json
type StringList []string

func (l StringList) MarshalJSON() ([]byte, error) {
	if l == nil {
		return nil, nil
	}
	return json.Marshal(strings.Join(l, ","))
}

func (l *StringList) UnmarshalJSON(data []byte) error {
	var inner string
	err := json.Unmarshal(data, &inner)

		// but we insert at the beginning there too just for consistency.
		ptest.Imports = str.StringList(p.TestImports, p.Imports)
		ptest.Internal.Imports = append(imports, p.Internal.Imports...)
		ptest.Internal.RawImports = str.StringList(rawTestImports, p.Internal.RawImports)
		ptest.Internal.ForceLibrary = true
		ptest.Internal.BuildInfo = nil
		ptest.Internal.Build = new(build.Package)

	if err != nil {
		return err
	}
	if !bytes.Equal(data1, data2) {
		return fmt.Errorf("%s and %s produced different output files:\n%s\n%s", filepath.Base(args[1].(string)), newTool, strings.Join(str.StringList(args...), " "), strings.Join(str.StringList(newArgs...), " "))
	}
	os.Remove(ofile + ".new")
	return nil
}

func (gcToolchain) pack(b *Builder, a *Action, afile string, ofiles []string) error {
	var absOfiles []string

	Int(name string, def int, usage string) *int
	Float64(name string, def float64, usage string) *float64
	String(name string, def string, usage string) *string

	// StringList is similar to String but allows multiple values for a
	// single flag
	StringList(name string, def string, usage string) *[]*string

	// ExtraUsage returns any additional text that should be printed after the

	// for testing vet or supplying an alternative analysis tool.
	if name == "vet" && VetTool != "" {
		path = VetTool
		desc = VetTool
	}

	cmdline := str.StringList(cfg.BuildToolexec, path, "-V=full")
	cmd := exec.Command(cmdline[0], cmdline[1:]...)
	var stdout, stderr strings.Builder
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr
	if err := cmd.Run(); err != nil {

		gcargs = append(gcargs, "-fgo-pkgpath="+pkgpath)
	}
	if p.Internal.LocalPrefix != "" {
		gcargs = append(gcargs, "-fgo-relative-import-path="+p.Internal.LocalPrefix)
	}

	args := str.StringList(tools.compiler(), "-c", gcargs, "-o", ofile, forcedGccgoflags)
	if importcfg != nil {
		if b.gccSupportsFlag(args[:1], "-fgo-importcfg=/dev/null") {
			if err := sh.writeFile(objdir+"importcfg", importcfg); err != nil {

	Int(name string, def int, usage string) *int
	Float64(name string, def float64, usage string) *float64
	String(name string, def string, usage string) *string

	// StringList is similar to String but allows multiple values for a
	// single flag
	StringList(name string, def string, usage string) *[]*string

	// ExtraUsage returns any additional text that should be printed after the

	if dir != "" {
		if err := sh.Mkdir(dir); err != nil {
			return err
		}
	}

	gofiles := str.StringList(p.GoFiles)
	cgofiles := str.StringList(p.CgoFiles)
	cfiles := str.StringList(p.CFiles)
	sfiles := str.StringList(p.SFiles)
	cxxfiles := str.StringList(p.CXXFiles)
	var objects, cgoObjects, pcCFLAGS, pcLDFLAGS []string

	if p.UsesCgo() || p.UsesSwig() {

}

// Run runs the command, with stdout and stderr
// connected to the go command's own stdout and stderr.
// If the command fails, Run reports the error using Errorf.
func Run(cmdargs ...any) {
	cmdline := str.StringList(cmdargs...)
	if cfg.BuildN || cfg.BuildX {
		fmt.Printf("%s\n", strings.Join(cmdline, " "))
		if cfg.BuildN {
			return
		}
	}

	cmd := exec.Command(cmdline[0], cmdline[1:]...)