disabling unary "-" for unsigned types

[Andrei Alexandrescu]

Walter Bright wrote:
> dsimcha wrote:
>> The more you bring up features to give the axe to, the more I find it 
>> funny that,
>> not being a very good language lawyer, I wasn't aware that half of 
>> these features
>> existed in the first place.
> 
> D is a very ambitious language, and we are definitely shooting for the 
> stars with it. That means that there are many features that missed or 
> otherwise failed to find a target. So we're doing a little pruning for 
> D2, and a big part of posting these possible prunes here is to make sure 
> we aren't missing an important use case for them.
> 
> One problem C/C++ has is there are several failed features in them that 
> the C/C++ community has repeatedly tried to excise, but they just won't 
> die. Trigraphs are an example.

And custom operator new is another :o).

Andrei