By patenting this language feature Apple has very clearly stated that they are "making a claim of ownership" as it were of this feature across all languages and non-derivative implementations.
...which is a perfect example of why software patents shouldn't exist in the first place. One could implement this feature in any number of novel, unique ways therefore the patent is nothing more than a claim on a broad concept rather than a specific implementation (which is what patents are supposed to cover).
The paradox of patents on software is this: If the patent covers what it's supposed to cover (a specific implementation) the patent will be useless because anyone could implement what amounts to the same thing using different methods, languages, whatever. If the patent covers a broad concept it will prevent anyone from using it or innovating in that entire domain until the patent expires. Completely defeating the purpose of having patents in the first place. It will also likely (after millions upon millions of dollars wasted in lawsuits) be ruled invalid as being overly broad.
Software patents are inherently a bad idea and should be done away with.