Smart slicing

[BCS]

Reply to bearophile,

> Trevor Parscal:
> 
>> Allowing negetive indexes seems like a nice feature - but in fact
>> acts to hide bugs in software, which is something that D makes
>> efforts not to do.
>> 
> In practice it rarely produces bugs, but note that my whole post was
> not about negative indexes, it was about out-of-bound arrays
> (positive) indexes.
> 

BTW: this "array[i%$];" does both.

> Bye,
> bearophile