def loop_eval input
    if eval_binding.kind_of?(Binding)
      eval_binding.eval(input, "(#{name})", line)
    else
      eval_binding.instance_eval(input, "(#{name})", line)
    end
  end
def loop_eval input
    if eval_binding.kind_of?(Binding)
      eval_binding.eval(input, "(#{name})", line)
    else
      eval_binding.instance_eval(input, "(#{name})", line)
    end
  end
Evaluate user input with #eval_binding, name and line