On Thursday, 21 January 2016 at 23:19:19 UTC, Brian Schott wrote:
Every time a new keyword is added to the language some working code will become invalid.
Well, technically, since UDAs exist, every new @thing is potential breakage too, though of course, limited in scope.
(If I was doing it, I'd actually make the ones be implicitly imported names, so you could disambiguate with teh module system like normal if that did happen, but meh.)