From: Jan Kybic <kybic@fel.cvut.cz>
>>Do you know if ATS is performing array bound checking? The OCaml code is
>>nearly 2X faster with -unsafe than without.
> 
> Yes, I think the ATS code does perform bound checking. There is
> probably a way to avoid it but I do not know how to do it yet.

The whole point of ATS is to use a richer type system to avoid many
runtime checks. Static check of bounds is supposedly one of them.
If your program is written with the clever .<n>. annotations (I don't
remember the exact syntax), then there should be no bound checks at
runtime.
Not that this is not equivalent to ocaml's -unsafe: the program is
still safe, since the checks were done at compile time.

Jacques Garrigue