Questions about the slice operator

[Christophe]

"Jonathan M Davis" , dans le message (digitalmars.D.learn:34243), a
> Except that opSlice already works with "..". What would this buy you?

Having a specific range for a .. operator allows you to have them as 
parameters of any function.

For example, this could be nice for multidimensional slicing:
Matrix!(double, 6, 6) A;
auto partOfA = A[1..3, 4..6];

Operations on several items of a container:
Container B;
B.remove(4..9); // remove 5 contiguous elements.

etc.