counterSwitchExec.Inc()
	Exec(tv)
	panic("unreachable")
}

var counterSwitchExec = telemetry.NewCounter("go/toolchain/switch-exec")

// SwitchOrFatal attempts a toolchain switch based on the information in err
// and otherwise falls back to base.Fatal(err).
func SwitchOrFatal(ctx context.Context, err error) {
	var s Switcher
	s.Error(err)
	s.Switch(ctx)
	base.Exit()
}

	modload.ForceUseModules = true
	modload.RootMode = modload.NeedRoot

	goVersion := tidyGo.String()
	if goVersion != "" && gover.Compare(gover.Local(), goVersion) < 0 {
		toolchain.SwitchOrFatal(ctx, &gover.TooNewError{
			What:      "-go flag",
			GoVersion: goVersion,
		})
	}

	modload.LoadPackages(ctx, modload.PackageOpts{
		TidyGoVersion:            tidyGo.String(),