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

[karabuta via Digitalmars-d]

On Saturday, 23 January 2016 at 20:11:35 UTC, tsbockman wrote:
> On Saturday, 23 January 2016 at 20:07:48 UTC, karabuta wrote:
>> On Friday, 22 January 2016 at 04:30:33 UTC, tsbockman wrote:
>>> I don't necessarily disagree with your overall point, but I 
>>> think the question of whether a few attributes have an @ 
>>> attached to them or not ranks pretty low on the list of "70% 
>>> solutions with marginal support" that need fixing/fleshing 
>>> out. If this is truly among the most pressing issues with D, 
>>> then D must be in great shape.
>>>
>>> [...]
>>
>>
>> Well, it's a big issue for me :)
>
> Then I guess D must be in great shape :-D


And now they will argue about curly braces and semi-colons and 
the real issues for this thread will be forgotten and there will 
always be issues not resolved. People keep the hate in their 
heart and it leads to a whole lot of problem and heart  and 
mental disease :)

Seriously, @