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

[Wyatt via Digitalmars-d]

On Friday, 22 January 2016 at 08:23:48 UTC, Ola Fosheim Grøstad 
wrote:
>
> And, IMO, when redoing the syntax one might want to look at 
> contemporary languages like Swift and C# to see if one can 
> lower the barrier to entry for Apple and Microsoft type 
> programmers.
>
"Contemporary". ;)  Aside from Swift's optional semicolons, 
they're really not all that different.

> I am not sure if looking like C is all that attractive in 2016 
> as far as recruiting goes. By 2025 C-style syntax might be 
> viewed as arcane among young programmers.

Like Swift, C#, Javascript, Go, Haxe, Rust, Dart, et al?  Really, 
people have been predicting the death of curly-braces languages 
for decades now, and they're as strong as ever.

Do you have anything to base this on, or is it just what you'd 
(apparently) like to see?

-Wyatt