On Fri, 7 Jun 2002, Jacques Garrigue wrote:

> > Interaction with local modules
> > ------------------------------
> > 
> > Inside a local module, type variables introduced outside the module are
> > invisible:
> > 
> > # let f (x : 'a) =
> >     let module M = struct type t = 'a list end in ();;
> > Unbound type parameter 'a
> 
> To be expected by the rules above. Functions with local modules are
> not functors. 'a is not a type constructor.

this has a draw-back : some local modules don't have any valid
signature :
for exemple, what is the signature of the module M ?

let f (x:'a) = 
  let module M = struct let v = x end
  in ...

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