Re: [Caml-list] Re: GenerateFold

["Nicolas Pouillard" <nicolas.pouillard@gmail.com>]

Ok there is a bug in the fold generation we using records, but the
previous example (without records) compiled fine for me. So
records+fold is buggy for now.

On 6/1/07, Joel Reymont <joelr1@gmail.com> wrote:
> Doesn't work!
>
> On Jun 1, 2007, at 2:30 PM, Nicolas Pouillard wrote:
>
> > Got it:
> >
> > There is the solution available for meditation :)
>
> To be precise, I don't know if it works or not. I think the fold
> generator bombs out.
>
> I have no idea how to debug this but, again, it has nothing to do
> with the implementation of is_fun_arg.
>
> Simply using GenerateFold triggers the error. Notice that everything
> but class fold = ... is commented out. I'm including everything
> needed to reproduce the error, just in case.
>
> ocamlbuild c.byte
> + /usr/local/bin/ocamlc.opt -c -I +camlp4 -pp 'camlp4of -I src -
> filter map -filter fold -filter trash ' -o b.cmo b.ml
> File "ghost-location", line 1, characters 0-0:
> This expression has type
>    < array : 'b. ('a -> 'b -> 'a) -> 'b array -> 'a; bool : bool -> 'a;
>      expr : A.expr -> 'a; float : float -> 'a; id : A.id -> 'a;
>      input_decl : A.input_decl -> 'a; int : int -> 'a;
>      list : 'c. ('a -> 'c -> 'a) -> 'c list -> 'a;
>      option : 'd. ('a -> 'd -> 'a) -> 'd option -> 'a; order :
> A.order -> 'a;
>      order_type : A.order_type -> 'a; program : A.program -> 'a;
>      ref : 'e. ('a -> 'e -> 'a) -> 'e ref -> 'a;
>      statement : A.statement -> 'a; string : string -> 'a;
>      subscript : A.subscript -> 'a; ty : A.ty -> 'a; .. >
>    as 'a
> but is here used with type A.order_type
>
> cat b.ml
> open A
>
> class fold = Camlp4Filters.GenerateFold.generated;;
>
> (*
> let is_fun_arg = object
> inherit fold as super
> val found = false
> method found = found
> method input_decl x =
>     match x with
>       | `FunArgDecl _ -> {< found = true >}
>       | _             -> super#input_decl x
> end
>
> let is_fun x = (is_fun_arg#statement x)#found;;
> *)
>
> module Camlp4Trash = struct
>    INCLUDE "a.ml";;
> end;;
>
> cat a.ml
> type id = string
>
> and program = statement list
>
> and ty =
>      [
>      | `TyAny
>      ]
>
> and statement =
>      [
>      | `Skip
>      | `InputDecls of input_decl list
>      ]
>
> and subscript = expr list
>
> and input_decl =
>      [
>      | `InputDecl of id * ty * expr
>      | `FunArgDecl of id * ty * subscript
>      ]
>
> and expr =
>      [
>      | `Int of int
>      | `Float of float
>      | `Str of string
>      ]
>
> and order = {
>    order_type: order_type;
> }
>
> and order_type =
>      [
>      | `Buy
>      | `Sell
>      | `Short
>      | `Cover
>      ]
>
> cat c.ml
> open A
> open B
>
> cat _tags
> "b.ml": use_camlp4, pp(camlp4of -I src -filter map -filter fold -
> filter trash )
>
>
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>
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>
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>


-- 
Nicolas Pouillard