Integral types that define opCmp, opEquals

[Frits van Bommel]

Henning Hasemann wrote:
>  
>> untested but it might work:
>>
>> const T i;
>> is(i < i);
>>
> 
> I tried this last week or so. Result is:
> found '<' when expecting ')'
> 
> So it seem is() doesnt like "<".

IIRC 'is' tests if a _type_ is valid. Try something like is(typeof(i < i)).