Re: '_a

[Vincenzo Ciancia <vincenzo_yahoo_addressguard-gmane@yahoo.it>]

skaller wrote:

> An exception free implementation of List.hd would
> always produce the correct typing:
> 
> let hd x = function
> | [] -> None
> | h :: _ -> Some h
> 
> In effect, Ocaml first pretends unsound typing is actually sound,
> and then enforces this at run time by throwing an exception
> where one would otherwise accuse the type system of unsoundness,
> but claims the error is not a type error.

What about the possibility to include possible exceptions into a function
signature (a la java)? Does this have problems with type inference? Also,
there is the ocamlexc tool:

http://caml.inria.fr/ocamlexc/ocamlexc.htm

what about it? 

V.

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