I think that might have do with laziness? If you have a side-effecting expression and you try to pretend it's call-by-need, then bad things happen (beta reduction is no longer valid!)
Do you have an example in OCaml? I admit I am curious as to why their
compiler would do such a thing.
On 3/20/19 8:45 PM, Brandon Barker wrote:
> I'm a little rusty, so can't come up with many good examples.
>
> Apparently it is possible to do something like this in OCaml:
>
> |
> implement
> main0 ()={
> val ()=let
> val ha =print("ha")
> in
> (ha;ha)// How to get two ha's here?
> end
> }
> |
>
>
> After running the program, you would only see one "ha", which violates RT.
>
> However, ATS doesn't seem to allow a sequence expression in the "in"
> position of a let expression, as this doesn't compile. Admittedly I'm
> just trying to see if ATS2 doesn't have RT in this particular case,
> but it would also be good to know about the sequence expressions here.
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