code: func MustNewCmdWithRunner(cmdName string, runner func()) *CmdWithRunner {
  	cmdWithRunner, err := NewCmdWithRunner(cmdName, runner)
  	if err != nil {
  		panic(err)
  	}
  	return cmdWithRunner
  }
docs: // MustNewCmdWithRunner returns the result of NewCmdWithRunner and panics in cases where the function returns an error.