}
		_, dup := scriptGoInvoked.LoadOrStore(t, true)
		if !dup {
			t.Cleanup(func() { scriptGoInvoked.Delete(t) })
		}
		return cmd.Run(state, s...)
	})
}

// scriptStale checks that the named build targets are stale.
func scriptStale(cmdGo script.Cmd) script.Cmd {
	return script.Command(
		script.CmdUsage{
			Summary: "check that build targets are stale",
			Args:    "target...",
		},