arrays - How can a slice contain itself?

Question

I'm trying to learn Golang using "The Go Programming Language" and I've reached the section on slices. They make the comparison between arrays and slices in that two arrays can be compared with == where two slices can not. The text reads as the following:

"== operator for arrays of strings, it may be puzzling that slice
comparisons do not also work this way. There are two reasons why deep 
equivalence is problematic. First, unlike array elements, the elements
of a slice are indirect, making it possible for a slice to contain 
itself. Although there are ways to deal with such cases, none is 
simple, efficient, and most importantly, obvious."

What is meant by it's possible for a slice to contain itself due to the elements being indirect?

Answer 1

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