return err
		}
	}
	b.WorkDir = ""
	return nil
}

func closeBuilders() {
	leakedBuilders := 0
	builderWorkDirs.Range(func(bi, _ any) bool {
		leakedBuilders++
		if err := bi.(*Builder).Close(); err != nil {
			base.Error(err)
		}
		return true
	})

	if leakedBuilders > 0 && base.GetExitStatus() == 0 {
		fmt.Fprintf(os.Stderr, "go: internal error: Builder leaked on successful exit\n")