if os.Getenv("GO_PACKTEST_IS_PACK") != "" {
		main()
		os.Exit(0)
	}

	os.Setenv("GO_PACKTEST_IS_PACK", "1") // Set for subprocesses to inherit.
	os.Exit(m.Run())
}

// packPath returns the path to the "pack" binary to run.
func packPath(t testing.TB) string {
	t.Helper()
	testenv.MustHaveExec(t)

	packPathOnce.Do(func() {
		packExePath, packPathErr = os.Executable()
	})
	if packPathErr != nil {