dir, _ := filepath.Split(a.Target)
	if dir != "" {
		if err := sh.Mkdir(dir); err != nil {
			return err
		}
	}

	if !a.buggyInstall {
		defer b.cleanup(a1)
	}

	return sh.moveOrCopyFile(a.Target, a1.built, perm, false)
}

// AllowInstall returns a non-nil error if this invocation of the go command is
// allowed to install a.Target.
//