How to get the "last" element of a Collection?

Using Swift
3

I got this error after using BidirectionalCollection:

Referencing property 'last' on 'ChunkedByCount' requires that 'Self' conform to 'RandomAccessCollection'

So I change to RandomAccessCollection and it works now. Why is it want RandomAccessCollection and BidirectionalCollection is not good enough?

Can the compiler give guidance to my original problem:

“You want to use .last? Upgrade to RandomAccessCollection”

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