Why do some attributes start with '@' while others done't?

[Adam D. Ruppe via Digitalmars-d]

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.)