var goexperiment, gotypesalias string
	flags := flag.NewFlagSet("", flag.PanicOnError)
	flags.StringVar(&conf.GoVersion, "lang", "", "")
	flags.StringVar(&goexperiment, "goexperiment", "", "")
	flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
	flags.StringVar(&gotypesalias, "gotypesalias", "", "")
	if err := parseFlags(srcs[0], flags); err != nil {
		t.Fatal(err)
	}

// do is the workhorse, broken out of main to make testing easier.
func do(writer io.Writer, flagSet *flag.FlagSet, args []string) (err error) {
	flagSet.Usage = usage
	unexported = false
	matchCase = false
	flagSet.StringVar(&chdir, "C", "", "change to `dir` before running command")
	flagSet.BoolVar(&unexported, "u", false, "show unexported symbols as well as exported")

var vendorO string // if set, overrides the default output directory

func init() {
	cmdVendor.Flag.BoolVar(&cfg.BuildV, "v", false, "")
	cmdVendor.Flag.BoolVar(&vendorE, "e", false, "")
	cmdVendor.Flag.StringVar(&vendorO, "o", "", "")
	base.AddChdirFlag(&cmdVendor.Flag)
	base.AddModCommonFlags(&cmdVendor.Flag)
}

func runVendor(ctx context.Context, cmd *base.Command, args []string) {
	modload.InitWorkfile()

	flag.BoolVar(&t.race, "race", false, "run in race builder mode (different set of tests)")
	flag.BoolVar(&t.compileOnly, "compile-only", false, "compile tests, but don't run them")
	flag.StringVar(&t.banner, "banner", "##### ", "banner prefix; blank means no section banners")
	flag.StringVar(&t.runRxStr, "run", "",
		"run only those tests matching the regular expression; empty means to run all. "+
			"Special exception: if the string begins with '!', the match is inverted.")