>From: "Mattias Waldau" <mattias.waldau@tacton.se>

>Of cource, I could catch each of these at their location, and raise a
>specific exception for each.
>This, however, would mess up the code.

No need for a specific expression, just use "assert false":

  try Hashtbl.find foo bar
  with Not_found -> assert false

and it will report the exact location of the problem.

-- Damien