Custom attributes (again)

[Manu]

On 5 April 2012 21:32, Timon Gehr <timon.gehr at gmx.ch> wrote:

> On 04/05/2012 08:05 PM, Andrei Alexandrescu wrote:
>
>> On 4/5/12 12:44 PM, deadalnix wrote:
>>
>>> Le 05/04/2012 19:35, Walter Bright a écrit :
>>>
>>>> On 4/5/2012 5:00 AM, Manu wrote:
>>>>
>>>>> C# and Java both have attributes, following these established design
>>>>> patterns, I
>>>>> don't think there should be any mystery over how they should be
>>>>> implemented.
>>>>>
>>>>
>>>> At the Lang.NEXT conference over the last 3 days, I was able to talk to
>>>> many smart people about attributes. But I did find some confusion - are
>>>> they best attached to the variable/function (i.e. "storage class"), or
>>>> attached to the type ("type constructor")? I think the former. Attaching
>>>> it to the type leads to all sorts of semantic issues.
>>>>
>>>> From your list of uses, it looks like attaching it to the variable or
>>>> function is an apropos solution.
>>>>
>>>
>>> They should be attached to declarations.
>>>
>>
>> The question was whether the declaration affects the type of the
>> declared or not.
>>
>> Andrei
>>
>
> Ideally it would be powerful enough to allow changing the type, but most
> applications probably want the type to stay the same.
>

Didn't someone already say there were existing language defined attributes
that could be neatly implemented via libs if the feature were available?
Which ones were they?
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