Re: [Caml-list] Records typing

[Andreas Rossberg <rossberg@ps.uni-sb.de>]

malc wrote:
> 
> # module type T = sig type t type r = { f : t } end;;
> module type T = sig type t and r = { f : t; }  end
> 
> # module M : T with type t = float = struct
>   type t = float
>   type r = { f : t }
> end;;
> 
> Signature mismatch:
> Modules do not match:
>   sig type t = float and r = { f : t; }  end
> is not included in
>   sig type t = float and r = { f : t; }  end
> Type declarations do not match:
>   type r = { f : t; }
> is not included in
>   type r = { f : t; }
> 
> Is there a way to work around this?

This seems to be a bug. You can work around it using "and" to connect
the type declarations in the structure:

# module type T = sig type t type r = { f : t } end;;
module type T = sig type t and r = { f : t; }  end
# module M : T with type t = float = struct
  type t = float
  and r = { f : t }
end;;
module M : sig type t = float and r = { f : t; }  end
#

-- 
Andreas Rossberg, rossberg@ps.uni-sb.de

"Computer games don't affect kids; I mean if Pac Man affected us
 as kids, we would all be running around in darkened rooms, munching
 magic pills, and listening to repetitive electronic music."
 - Kristian Wilson, Nintendo Inc.
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