pry非常适合调试BasicObject的子类!
https://github.com/pry/pry说pry有:"Exotic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？