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

[jmh530 via Digitalmars-d]

On Thursday, 21 January 2016 at 23:48:03 UTC, Brian Schott wrote:
>
> Yeah. Somebody should write something like that.
>
> Waaaait. Hang on. *I* wrote something like that. The problem is 
> that nobody wants to make breaking changes even though dfix 
> exists.
>
> https://github.com/Hackerpilot/dfix

Perhaps they could begin a process, like adding @pure and 
@nothrow. Then, people at least people can update source code at 
their own pace. I doubt adding those would break much code (which 
makes me wonder if it would be possible to do something like go 
through all of the dub repository and estimate if any code would 
get broken by it).