Patents are about how you do something, not what you do.
This patent is about how Apple's compiler implements some programing language features. It does not protect the programming language feature itself. Another compiler that employs a different 'how' can implement the same programming feature. So, if you don't want to infringe on this patent, you are forced to invent (or use) another way of doing the same thing.
Re:Apple is patenting Swift features
by michaelmrose on Saturday January 26, 2019 @02:01AM
(#19005236)
They didn't invent anything anymore than I invented the peanut butter sandwich i made yesterday
They're about innovating technological abilities, and disclosing them in exchange for limited monopoly; it's not about specific products or specific implementations.
If it were just about implementations then all patents could be easily circumvented and there would be no reward in exchange for the full disclosure of a new invention.
(Design patents do cover specific implementations at the morphological level.)