(**************************************************************************)
(*                                                                        *)
(*                                 OCaml                                  *)
(*                                                                        *)
(*             Xavier Leroy, projet Cristal, INRIA Rocquencourt           *)
(*                                                                        *)
(*   Copyright 1996 Institut National de Recherche en Informatique et     *)
(*     en Automatique.                                                    *)
(*                                                                        *)
(*   All rights reserved.  This file is distributed under the terms of    *)
(*   the GNU Lesser General Public License version 2.1, with the          *)
(*   special exception on linking described in the file LICENSE.          *)
(*                                                                        *)
(**************************************************************************)

(* Typechecking of type expressions for the core language *)

open Types

val transl_simple_type :
  Env.t -> bool -> Parsetree.core_type -> Typedtree.core_type
val transl_simple_type_univars :
  Env.t -> Parsetree.core_type -> Typedtree.core_type
val transl_simple_type_delayed :
  Env.t -> Parsetree.core_type -> Typedtree.core_type * (unit -> unit)
(* Translate a type, but leave type variables unbound. Returns
   the type and a function that binds the type variable. *)

val transl_type_scheme : Env.t -> Parsetree.core_type -> Typedtree.core_type
val reset_type_variables : unit -> unit
val type_variable : Location.t -> string -> type_expr
val transl_type_param : Env.t -> Parsetree.core_type -> Typedtree.core_type

type variable_context
val narrow : unit -> variable_context
val widen : variable_context -> unit

exception Already_bound

type error =
  | Unbound_type_variable of string
  | Unbound_type_constructor of Longident.t
  | Unbound_type_constructor_2 of Path.t
  | Type_arity_mismatch of Longident.t * int * int
  | Bound_type_variable of string
  | Recursive_type
  | Unbound_row_variable of Longident.t
  | Type_mismatch of (type_expr * type_expr) list
  | Alias_type_mismatch of (type_expr * type_expr) list
  | Present_has_conjunction of string
  | Present_has_no_type of string
  | Constructor_mismatch of type_expr * type_expr
  | Not_a_variant of type_expr
  | Variant_tags of string * string
  | Invalid_variable_name of string
  | Cannot_quantify of string * type_expr
  | Multiple_constraints_on_type of Longident.t
  | Method_mismatch of string * type_expr * type_expr
  | Unbound_value of Longident.t
  | Unbound_constructor of Longident.t
  | Unbound_label of Longident.t
  | Unbound_module of Longident.t
  | Unbound_class of Longident.t
  | Unbound_modtype of Longident.t
  | Unbound_cltype of Longident.t
  | Ill_typed_functor_application of Longident.t
  | Illegal_reference_to_recursive_module
  | Access_functor_as_structure of Longident.t
  | Apply_structure_as_functor of Longident.t
  | Cannot_scrape_alias of Longident.t * Path.t
  | Opened_object of Path.t option
  | Not_an_object of type_expr

exception Error of Location.t * Env.t * error

val report_error : Env.t -> Format.formatter -> error -> unit

(* Support for first-class modules. *)
val transl_modtype_longident :
  (* from Typemod *)
  (Location.t -> Env.t -> Longident.t -> Path.t) ref
val transl_modtype :
  (* from Typemod *)
  (Env.t -> Parsetree.module_type -> Typedtree.module_type) ref
val create_package_mty :
  Location.t ->
  Env.t ->
  Parsetree.package_type ->
  (Longident.t Asttypes.loc * Parsetree.core_type) list * Parsetree.module_type

val find_type : Env.t -> Location.t -> Longident.t -> Path.t * type_declaration
val find_constructor :
  Env.t -> Location.t -> Longident.t -> constructor_description
val find_all_constructors :
  Env.t ->
  Location.t ->
  Longident.t ->
  (constructor_description * (unit -> unit)) list
val find_label : Env.t -> Location.t -> Longident.t -> label_description
val find_all_labels :
  Env.t ->
  Location.t ->
  Longident.t ->
  (label_description * (unit -> unit)) list
val find_value :
  Env.t -> Location.t -> Longident.t -> Path.t * value_description
val find_class :
  Env.t -> Location.t -> Longident.t -> Path.t * class_declaration
val find_module :
  Env.t -> Location.t -> Longident.t -> Path.t * module_declaration
val lookup_module : ?load:bool -> Env.t -> Location.t -> Longident.t -> Path.t
val find_modtype :
  Env.t -> Location.t -> Longident.t -> Path.t * modtype_declaration
val find_class_type :
  Env.t -> Location.t -> Longident.t -> Path.t * class_type_declaration

val unbound_constructor_error : Env.t -> Longident.t Location.loc -> 'a
val unbound_label_error : Env.t -> Longident.t Location.loc -> 'a

val spellcheck :
  Format.formatter ->
  (('a -> 'a list -> 'a list) ->
  Longident.t option ->
  'b ->
  'c list ->
  string list) ->
  'b ->
  Longident.t ->
  unit
