A few clarifications, b does not point to a. a and b are variables of type 
[]int. The value of each slice's ptr fields point to a backing array of some 
capacity. 

If you append to a, this does not change th length or cap fields of b. If you 
do this enough times that ptr field of a will be updated to reflect that it now 
points to a different backing array. 

Perhaps something like this could be used to determine if a and b point to th 
same backing array, but as you suggested, it's probably the wrong question.

https://play.golang.org/p/kS4iysimIV

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