std.allocator needs your help

[Namespace]

On Tuesday, 24 September 2013 at 22:39:27 UTC, Andrei 
Alexandrescu wrote:
> On 9/24/13 3:11 PM, Namespace wrote:
>>> I would rather want new to be overloadable and have 2 sets of 
>>> parameters
>>>
>>> new (allocator)(arg1, arg2)
>>>
>>> Where "allocator" would go to the overloaded version of new 
>>> and "arg1"
>>> and "arg2" will be passed to the constructor.
>>
>> +1
>
> We're banning that syntax of new.
>
> Andrei

What's wrong with this syntax?
And: *That* syntax or complete 'new' as built-in feature?