Incrementation / decrementation ++ -- not working

FYI in case anyone else will get confused with the content on page 99 / „Listing 4.13 Incrementing and decrementing”

While my version of the book (2015) mentiones those iterators, they are not valid since Swift 3.
source : https://github.com/apple/swift-evolution/blob/master/proposals/0004-remove-pre-post-inc-decrement.md

Hope it will save someone time researching why the code won’t run :slight_smile:

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