let's say i have a function or method to get fib

func fib(n int){
  return fib(n-1) + fib(n-2)

now i want to add a counter to track how many times i have called to fib.

in python or jave i can easy use `decorator patten` to do it. 

but in go, you can not change fib since it is a function. if you define fib 
as a method, you cannot do it either since go did not have `Inherited`. you 
cannot call father class.

so golang did not support such thing? can we just reflect to do so?  

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