[Ur] --- operator

[Adam Chlipala]

Marc Weber wrote:
> Although I fully understand what it does I still don't know how .ur code
> looks like which uses --- operator.
>
> Can someone just replace the (* now drop AA .. *) comment by working
> code so that I can learn how this is done?
> In which way would the existing typing rule have helped me figuring out
> what to place there?
>
>          let
>            val rc1rc2 = {AA = 7, B = 8}
>
>            val r = rc1rc2 --- (* now drop AA using --- operator *)
>
>            (*  using -- would be:  rc1rc2 -- #AA *)
>
>          in
>            r.B
>          end
>    

The replacement you're looking for is:
     [AA = int]