if err := syscall.Exec(os.Args[0], argv, os.Environ()); err != nil {
			t.Fatal(err)
		}
	}

	var cmds []*exec.Cmd
	defer func() {
		for _, cmd := range cmds {
			cmd.Process.Kill()
		}
	}()

	args := append(append([]string(nil), os.Args[1:]...), "-test.run=^Test18146$")
	for n := attempts; n > 0; n-- {
		cmd := exec.Command(os.Args[0], args...)
		cmd.Env = append(os.Environ(), "test18146=exec")

	runArgs := append([]string{"run", "."}, args...)
	cmd := exec.Command("go", runArgs...)
	cmd.Dir = dir
	if lto {
		const cflags = "-flto -Wno-lto-type-mismatch -Wno-unknown-warning-option"
		cmd.Env = append(cmd.Environ(),
			"CGO_CFLAGS="+cflags,
			"CGO_CXXFLAGS="+cflags,
			"CGO_LDFLAGS="+cflags)
	}
	out, err := cmd.CombinedOutput()
	if string(out) != "OK\n" {
		t.Errorf("%s", string(out))
	}
	if err != nil {

pkg net/url, func JoinPath(string, ...string) (string, error) #47005
pkg net/url, method (*URL) JoinPath(...string) *URL #47005
pkg net/url, type URL struct, OmitHost bool #46059
pkg os/exec, method (*Cmd) Environ() []string #50599
pkg os/exec, type Cmd struct, Err error #43724
pkg os/exec, var ErrDot error #43724
pkg regexp/syntax, const ErrNestingDepth = "expression nests too deeply" #51684

// the given context.
func listEnv(c *build.Context) []string {
	if c == nil {
		return os.Environ()
	}

	environ := append(os.Environ(),
		"GOOS="+c.GOOS,
		"GOARCH="+c.GOARCH)
	if c.CgoEnabled {
		environ = append(environ, "CGO_ENABLED=1")
	} else {
		environ = append(environ, "CGO_ENABLED=0")
	}
	return environ
}

type apiPackage struct {
	*types.Package
	Files []*ast.File
}

		// stale. Retry.
		attempt++
		time.Sleep(5 * time.Second)
	}
}

func runLLDB(target, appdir, deviceapp string, args []string) ([]byte, error) {
	var env []string
	for _, e := range os.Environ() {
		// Don't override TMPDIR, HOME, GOCACHE on the device.
		if strings.HasPrefix(e, "TMPDIR=") || strings.HasPrefix(e, "HOME=") || strings.HasPrefix(e, "GOCACHE=") {
			continue
		}
		env = append(env, e)
	}

pkg os, func Chown(string, int, int) error
pkg os, func Chtimes(string, time.Time, time.Time) error
pkg os, func Clearenv()
pkg os, func Create(string) (*File, error)
pkg os, func Environ() []string
pkg os, func Exit(int)
pkg os, func Expand(string, func(string) string) string
pkg os, func ExpandEnv(string) string
pkg os, func FindProcess(int) (*Process, error)
pkg os, func Getegid() int