pry非常适合调试BasicObject的子类！
https://github.com/pry/pry说撬具有：
“外来对象支持(BasicObject实例……”
但是怎么做呢？
可以预料,BasicObject不理解绑定.
NameError: undefined local variable or method `binding' for #<C30Course:0xbefbc0c>
调用method_missing时,何处发送绑定？
解决方法
您需要直接在Kernel上调用绑定方法,如下所示：
[13] pry(main)> class O < BasicObject
| def hi
| x = 10
| ::Kernel.binding.pry
| end
| end
=> nil
[14] pry(main)> O.new.hi
From: (pry) @ line 19 O#hi:
17: def hi
18: x = 10
=> 19: ::Kernel.binding.pry
20: end
[1] pry(unknown)> x
=> 10
[2] pry(unknown)> self
=> #<O:0x3fd5310d04f8>