(************************************************************************)
(*         *      The Rocq Prover / The Rocq Development Team           *)
(*  v      *         Copyright INRIA, CNRS and contributors             *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
(************************************************************************)

open Pp
open CErrors
open Util
open CAst
open Names
open Nameops
open Namegen
open Constr
open Context
open Libnames
open Globnames
open Impargs
open Glob_term
open Glob_ops
open Patternops
open Pretyping
open Structures
open Cases
open Constrexpr
open Constrexpr_ops
open Notation_term
open Notation_ops
open Notation
open Inductiveops
open Context.Rel.Declaration
open NumTok


(** constr_expr -> glob_constr translation:
    - it adds holes for implicit arguments
    - it replaces notations by their value (scopes stuff are here)
    - it recognizes global vars from local ones
    - it prepares pattern matching problems (a pattern becomes a tree
      where nodes are constructor/variable pairs and leafs are variables)

    All that at once, fasten your seatbelt!
*)

(* To interpret implicits and arg scopes of variables in inductive
   types and recursive definitions and of projection names in records *)

type var_internalization_type =
  | Inductive
  | Recursive
  | Method
  | Variable

type var_unique_id = string

let var_uid =
  let count = ref 0 in
  fun id -> incr count; Id.to_string id ^ ":" ^ string_of_int !count

type var_internalization_data = {
  (* type of the "free" variable, for coqdoc, e.g. while typing the
     constructor of JMeq, "JMeq" behaves as a variable of type Inductive *)
  var_intern_typ : var_internalization_type;
  (* signature of impargs of the variable *)
  var_impls : Impargs.implicit_status list;
  (* subscopes of the args of the variable *)
  var_scopes : scope_name list list;
  (* unique ID for coqdoc links *)
  var_uid : var_unique_id;
}

let make_var_data var_intern_typ var_impls var_scopes var_uid =
  {var_intern_typ; var_impls; var_scopes; var_uid}

type internalization_env = var_internalization_data Id.Map.t

type ltac_sign = {
  ltac_vars : Id.Set.t;
  ltac_bound : Id.Set.t;
  ltac_extra : Genintern.Store.t;
}

(**********************************************************************)
(* Internalization errors                                             *)

type internalization_error =
  | VariableCapture of Id.t * Id.t
  | IllegalMetavariable
  | NotAConstructor of qualid
  | UnboundFixName of bool * Id.t
  | NonLinearPattern of Id.t
  | BadPatternsNumber of int * int
  | NotAProjection of qualid
  | ProjectionsOfDifferentRecords of Structure.t * Structure.t

exception InternalizationError of internalization_error

let explain_variable_capture id id' =
  Id.print id ++ str " is dependent in the type of " ++ Id.print id' ++
  strbrk ": cannot interpret both of them with the same type"

let explain_illegal_metavariable =
  str "Metavariables allowed only in patterns"

let explain_not_a_constructor qid =
  str "Unknown constructor: " ++ pr_qualid qid

let explain_unbound_fix_name is_cofix id =
  str "The name" ++ spc () ++ Id.print id ++
  spc () ++ str "is not bound in the corresponding" ++ spc () ++
  str (if is_cofix then "co" else "") ++ str "fixpoint definition"

let explain_non_linear_pattern id =
  str "The variable " ++ Id.print id ++ str " is bound several times in pattern"

let explain_bad_patterns_number n1 n2 =
  str "Expecting " ++ int n1 ++ str (String.plural n1 " pattern") ++
  str " but found " ++ int n2

let inductive_of_record s =
  let inductive = GlobRef.IndRef (s.Structure.name) in
  Nametab.shortest_qualid_of_global Id.Set.empty inductive

let explain_field_not_a_projection field_id =
  pr_qualid field_id ++ str ": Not a projection"

let explain_projections_of_diff_records record1 record2 =
  let inductive1_id = inductive_of_record record1 in
  let inductive2_id = inductive_of_record record2 in
  str "This record contains fields of both " ++ pr_qualid inductive1_id ++
  str " and " ++ pr_qualid inductive2_id

let explain_internalization_error e =
  let pp = match e with
  | VariableCapture (id,id') -> explain_variable_capture id id'
  | IllegalMetavariable -> explain_illegal_metavariable
  | NotAConstructor ref -> explain_not_a_constructor ref
  | UnboundFixName (iscofix,id) -> explain_unbound_fix_name iscofix id
  | NonLinearPattern id -> explain_non_linear_pattern id
  | BadPatternsNumber (n1,n2) -> explain_bad_patterns_number n1 n2
  | NotAProjection field_id -> explain_field_not_a_projection field_id
  | ProjectionsOfDifferentRecords (inductive1_id, inductive2_id) ->
    explain_projections_of_diff_records inductive1_id inductive2_id
  in pp ++ str "."

let _ = CErrors.register_handler (function
    | InternalizationError e ->
      Some (explain_internalization_error e)
    | _ -> None)

let error_bad_inductive_type ?loc ?info () =
  user_err ?loc ?info (str
    "This should be an inductive type applied to patterns.")

let error_parameter_not_implicit ?loc =
  user_err ?loc  (str
   "The parameters do not bind in patterns;" ++ spc () ++ str
    "they must be replaced by '_'.")

let error_ldots_var ?loc =
  user_err ?loc  (str "Special token " ++ Id.print ldots_var ++
    str " is for use in the Notation command.")

(**********************************************************************)
(* Pre-computing the implicit arguments and arguments scopes needed   *)
(* for interpretation *)

let parsing_explicit = ref false

let empty_internalization_env = Id.Map.empty

let compute_internalization_data env sigma ?silent id ty typ impl =
  let impl = compute_implicits_with_manual env sigma ?silent typ (is_implicit_args()) impl in
  make_var_data ty impl (compute_arguments_scope env sigma typ) (var_uid id)

let compute_internalization_env env sigma ?(impls=empty_internalization_env) ?force ty names =
  let force = match force with None -> List.map (fun _ -> Id.Set.empty) names | Some l -> l in
  let f force_ids = function {impl_pos=(na,_,_)} as impl ->
  match na with
  | Name id when Id.Set.mem id force_ids -> {impl with impl_force = false}
  | _ -> impl in
  List.fold_left4
    (fun map id force_ids typ impl ->
       let var_info = compute_internalization_data env sigma id ty typ impl in
       let impls = List.map (Option.map (f force_ids)) var_info.var_impls in
       Id.Map.add id {var_info with var_impls = impls} map)
    impls names force

let implicits_of_decl_in_internalization_env id (int_env:internalization_env) =
  let {var_impls=impls} = Id.Map.find id int_env in impls

(**********************************************************************)
(* Contracting "{ _ }" in notations *)

let rec wildcards ntn n =
  if Int.equal n (String.length ntn) then []
  else let l = spaces ntn (n+1) in if ntn.[n] == '_' then n::l else l
and spaces ntn n =
  if Int.equal n (String.length ntn) then []
  else if ntn.[n] == ' ' then wildcards ntn (n+1) else spaces ntn (n+1)

let expand_notation_string ntn n =
  let pos = List.nth (wildcards ntn 0) n in
  let hd = if Int.equal pos 0 then "" else String.sub ntn 0 pos in
  let tl =
    if Int.equal pos (String.length ntn) then ""
    else String.sub ntn (pos+1) (String.length ntn - pos -1) in
  hd ^ "{ _ }" ^ tl

(* This contracts the special case of "{ _ }" for sumbool, sumor notations *)
(* Remark: expansion of squash at definition is done in metasyntax.ml *)
let contract_curly_brackets ntn (l,ll,bl,bll) =
  match ntn with
  | InCustomEntry _,_ -> ntn,(l,ll,bl,bll)
  | InConstrEntry, ntn ->
  let ntn' = ref ntn in
  let rec contract_squash n = function
    | [] -> []
    | { CAst.v = CNotation (None,(InConstrEntry,"{ _ }"),([a],[],[],[])) } :: l ->
        ntn' := expand_notation_string !ntn' n;
        contract_squash n (a::l)
    | a :: l ->
        a::contract_squash (n+1) l in
  let l = contract_squash 0 l in
  (* side effect; don't inline *)
  (InConstrEntry,!ntn'),(l,ll,bl,bll)

let contract_curly_brackets_pat ntn (l,ll,bl) =
  match ntn with
  | InCustomEntry _,_ -> ntn,(l,ll,bl)
  | InConstrEntry, ntn ->
  let ntn' = ref ntn in
  let rec contract_squash n = function
    | [] -> []
    | { CAst.v = CPatNotation (None,(InConstrEntry,"{ _ }"),([a],[],[]),[]) } :: l ->
        ntn' := expand_notation_string !ntn' n;
        contract_squash n (a::l)
    | a :: l ->
        a::contract_squash (n+1) l in
  let l = contract_squash 0 l in
  (* side effect; don't inline *)
  (InConstrEntry,!ntn'),(l,ll,bl)

type local_univs = { bound : UnivNames.universe_binders; unb_univs : bool }

let empty_local_univs = { bound = UnivNames.empty_binders; unb_univs = false }

type abstraction_kind = AbsLambda | AbsPi

type intern_env = {
  ids: Id.Set.t;
  pattern_mode : bool;
  strict_check: bool option;
    (* None = not passed via ltac yet: works as "true" unless when interpreting
       ltac:() in which case we assume the default Ltac value, that is "false" *)
  local_univs: local_univs;
  tmp_scope: Notation_term.tmp_scope_name list;
  scopes: Notation_term.scope_name list;
  impls: internalization_env;
  binder_block_names: abstraction_kind option (* None = unknown *) option;
  ntn_binding_ids: Id.Set.t; (* subset of ids that are notation variables *)
}

type pattern_intern_env = {
  pat_scopes: Notation_term.subscopes;
  (* ids = Some means accept local variables; this is useful for
     terms as patterns parsed as patterns in notations *)
  pat_ids: Id.Set.t option;
}

(**********************************************************************)
(* Remembering the parsing scope of variables in notations            *)

let make_current_scope tmp scopes = match tmp, scopes with
  | [], scopes -> scopes
  | [tmp_scope], (sc :: _) when String.equal sc tmp_scope -> scopes
  | tmp_scope, scopes -> tmp_scope @ scopes

let pr_scope_stack begin_of_sentence l =
  let bstr x =
    if begin_of_sentence then str (CString.capitalize_ascii x) else str x in
  match l with
  | [] -> bstr "the empty scope stack"
  | [a] -> bstr "scope " ++ str a
  | l -> bstr "scope stack " ++
      str "[" ++ prlist_with_sep pr_comma str l ++ str "]"

let warn_inconsistent_scope =
  CWarnings.create ~name:"inconsistent-scopes" ~category:CWarnings.CoreCategories.syntax
    (fun (id,scopes1,scopes2) ->
      (str "Argument " ++ Id.print id ++
       strbrk " was previously inferred to be in " ++
       pr_scope_stack false scopes1 ++
       strbrk " but is here used in " ++
       pr_scope_stack false scopes2 ++
       strbrk ". " ++
       pr_scope_stack true scopes1 ++
       strbrk " will be used at parsing time unless you override it by" ++
       strbrk " annotating the argument with an explicit scope of choice."))

let error_expect_binder_notation_type ?loc id =
  user_err ?loc
   (Id.print id ++
    str " is expected to occur in binding position in the right-hand side.")

let set_notation_var_scope ?loc id (tmp_scope,subscopes as scopes) ntnbinders ntnvars =
  try
    let {Genintern.ntnvar_typ=typ} as status = Id.Map.find id ntnvars in
    match typ with
    | Notation_term.NtnInternTypeOnlyBinder -> error_expect_binder_notation_type ?loc id
    | Notation_term.NtnInternTypeAny principal ->
      let () = match status.ntnvar_scopes with
      | None -> status.ntnvar_scopes <- Some scopes
      | Some (tmp_scope', subscopes') ->
        let s' = make_current_scope tmp_scope' subscopes' in
        let s = make_current_scope tmp_scope subscopes in
        if Option.is_empty principal && not (List.equal String.equal s' s) then
          warn_inconsistent_scope ?loc (id,s',s)
      in
      let () = match status.ntnvar_binding_ids with
      | None -> status.ntnvar_binding_ids <- Some ntnbinders
      | Some ntnbinders' -> status.ntnvar_binding_ids <- Some (Id.Set.inter ntnbinders ntnbinders')
      in
      let () = match status.ntnvar_used with
        | [] -> () (* not recording if notation var is used *)
        | true :: _ -> () (* already marked used *)
        | false :: rest -> status.ntnvar_used <- true :: rest
      in
      ()
 with Not_found ->
    (* Not in a notation *)
    ()

let set_var_is_binder ?loc id ntnvars =
  try
    let status = Id.Map.find id ntnvars in
    status.Genintern.ntnvar_used_as_binder <- true
  with Not_found ->
    (* Not in a notation *)
    ()

let set_type_scope env = {env with tmp_scope = Notation.current_type_scope_names ()}

let reset_tmp_scope env = {env with tmp_scope = []}

let set_env_scopes env (scopt,subscopes) =
  {env with tmp_scope = scopt; scopes = subscopes @ env.scopes}

let env_for_pattern env =
  {pat_scopes = (env.tmp_scope, env.scopes); pat_ids = Some env.ids}

let mkGProd ?loc (na,bk,t) body = DAst.make ?loc @@ GProd (na, None, bk, t, body)
let mkGLambda ?loc (na,bk,t) body = DAst.make ?loc @@ GLambda (na, None, bk, t, body)

(**********************************************************************)
(* Utilities for binders                                              *)

let warn_shadowed_implicit_name =
  CWarnings.create ~name:"shadowed-implicit-name" ~category:CWarnings.CoreCategories.syntax
    Pp.(fun na -> str "Making shadowed name of implicit argument accessible by position.")

let exists_name na l =
  match na with
  | Name id -> List.exists (function Some { impl_pos = (Name id', _, _) } -> Id.equal id id' | _ -> false) l
  | _ -> false

let build_impls ?loc n bk na acc =
  let impl_status max =
    let na =
      if exists_name na acc then begin warn_shadowed_implicit_name ?loc na; Anonymous end
      else na in
    Some {
      impl_pos = (na, n, (*TODO, enhancement: compute dependency*) None);
      impl_expl = Manual;
      impl_max = max;
      impl_force = true
    }
  in
  match bk with
  | NonMaxImplicit -> impl_status false :: acc
  | MaxImplicit -> impl_status true :: acc
  | Explicit -> None :: acc

let impls_binder_list =
  let rec aux acc n = function
    | (na,_,bk,None,_) :: binders -> aux (build_impls n bk na acc) (n+1) binders
    | (na,_,bk,Some _,_) :: binders -> aux acc n binders
    | [] -> (n,acc)
  in aux []

let impls_type_list n ?(args = []) =
  let rec aux acc n c = match DAst.get c with
    | GProd (na,_,bk,_,c) -> aux (build_impls n bk na acc) (n+1) c
    | _ -> List.rev acc
  in aux args n

let impls_term_list n ?(args = []) =
  let rec aux acc n c = match DAst.get c with
    | GLambda (na,_,bk,_,c) -> aux (build_impls n bk na acc) (n+1) c
    | GRec (fix_kind, nas, args, tys, bds) ->
       let nb = match fix_kind with |GFix (_, n) -> n | GCoFix n -> n in
       let n,acc' = List.fold_left (fun (n,acc) (na, _, bk, _, _) -> (n+1,build_impls n bk na acc)) (n,acc) args.(nb) in
       aux acc' n bds.(nb)
    |_ -> List.rev acc
  in aux args n

(* Check if in binder "(x1 x2 .. xn : t)", none of x1 .. xn-1 occurs in t *)
let rec check_capture ty = let open CAst in function
  | { loc; v = Name id } :: { v = Name id' } :: _ when occur_glob_constr id ty ->
    Loc.raise ?loc (InternalizationError (VariableCapture (id,id')))
  | _::nal ->
      check_capture ty nal
  | [] ->
      ()

(** Status of the internalizer wrt "Arguments" of names *)

let restart_no_binders env =
  { env with binder_block_names = None}
  (* Not in relation with the "Arguments" of a name *)

let restart_prod_binders env =
  { env with binder_block_names = Some (Some AbsPi) }
  (* In a position binding a type to a name *)

let restart_lambda_binders env =
  { env with binder_block_names = Some (Some AbsLambda) }
  (* In a position binding a body to a name *)

let switch_prod_binders env =
  match env.binder_block_names with
  | Some o when o <> Some AbsLambda -> restart_prod_binders env
  | _ -> restart_no_binders env
  (* In a position switching to a type *)

let switch_lambda_binders env =
  match env.binder_block_names with
  | Some o when o <> Some AbsPi -> restart_lambda_binders env
  | _ -> restart_no_binders env
  (* In a position switching to a term *)

let slide_binders env =
  match env.binder_block_names with
  | Some o when o <> Some AbsPi -> restart_prod_binders env
  | _ -> restart_no_binders env
  (* In a position of cast *)

let binder_status_fun = {
  no = (fun x -> x);
  restart_prod = on_snd restart_prod_binders;
  restart_lambda = on_snd restart_lambda_binders;
  switch_prod = on_snd switch_prod_binders;
  switch_lambda = on_snd switch_lambda_binders;
  slide = on_snd slide_binders;
}

(* [test_kind_strict] rules out pattern which refers to global other
   than constructors or variables; It is used in instances of notations *)

let test_kind_pattern_in_notation ?loc = function
  | GlobRef.ConstructRef _ -> ()
    (* We do not accept non constructors to be used as variables in
       patterns *)
  | GlobRef.ConstRef _ ->
    user_err ?loc (str "Found a constant while a pattern was expected.")
  | GlobRef.IndRef _ ->
    user_err ?loc (str "Found an inductive type while a pattern was expected.")
  | GlobRef.VarRef _ ->
    (* we accept a section variable name to be used as pattern variable *)
    raise Not_found

let test_kind_ident_in_notation ?loc = function
  | GlobRef.ConstructRef _ ->
    user_err ?loc (str "Found a constructor while a variable name was expected.")
  | GlobRef.ConstRef _ ->
    user_err ?loc (str "Found a constant while a variable name was expected.")
  | GlobRef.IndRef _ ->
    user_err ?loc (str "Found an inductive type while a variable name was expected.")
  | GlobRef.VarRef _ ->
    (* we accept a section variable name to be used as pattern variable *)
    raise Not_found

(* [test_kind_tolerant] allow global reference names to be used as pattern variables *)

let test_kind_tolerant ?loc = function
  | GlobRef.ConstructRef _ -> ()
  | GlobRef.ConstRef _ | GlobRef.IndRef _ | GlobRef.VarRef _ ->
    (* A non-constructor global reference in a pattern is seen as a variable *)
    raise Not_found

(**)

let locate_if_hole ?loc na c = match DAst.get c with
  | GHole (GNamedHole _) -> c
  | GHole _ ->
      (try match na with
        | Name id -> glob_constr_of_notation_constr ?loc
                       (Reserve.find_reserved_type id)
        | Anonymous -> raise Not_found
      with Not_found -> DAst.make ?loc @@ GHole (GBinderType na))
  | _ -> c

let pure_push_name_env (id,implargs,is_ntn_id) env =
  {env with
    ids = Id.Set.add id env.ids;
    impls = Id.Map.add id implargs env.impls;
    ntn_binding_ids = if is_ntn_id then Id.Set.add id env.ntn_binding_ids else env.ntn_binding_ids;
  }

let push_name_env ~dump ntnvars implargs env =
  let open CAst in
  function
  | { loc; v = Anonymous } ->
      env
  | { loc; v = Name id } ->
      if Id.Map.is_empty ntnvars && Id.equal id ldots_var
        then error_ldots_var ?loc;
      set_var_is_binder ?loc id ntnvars;
      let uid = var_uid id in
      if dump then Dumpglob.dump_binding ?loc uid;
      pure_push_name_env (id,(make_var_data Variable implargs [] uid),Id.Map.mem id ntnvars) env

let remember_binders_impargs env bl =
  List.map_filter (fun (na,_,_,_,_) ->
      match na with
      | Anonymous -> None
      | Name id -> Some (id,Id.Map.find id env.impls,Id.Set.mem id env.ntn_binding_ids)) bl

let restore_binders_impargs env l =
  List.fold_right pure_push_name_env l env

let warn_ignoring_unexpected_implicit_binder_declaration =
  CWarnings.create ~name:"unexpected-implicit-declaration" ~category:CWarnings.CoreCategories.syntax
    Pp.(fun () -> str "Ignoring implicit binder declaration in unexpected position.")

let check_implicit_meaningful ?loc k env =
  if k <> Explicit && env.binder_block_names = None then
    (warn_ignoring_unexpected_implicit_binder_declaration ?loc (); Explicit)
  else
    k

let intern_generalized_binder ~dump intern_type ntnvars
    env {loc;v=na} b' t ty =
  let ids = (match na with Anonymous -> fun x -> x | Name na -> Id.Set.add na) env.ids in
  let ty, ids' =
    if t then ty, ids
    else Implicit_quantifiers.implicit_application ids ty
  in
  let ty' = intern_type {env with ids = ids; strict_check = Some false} ty in
  let fvs = Implicit_quantifiers.generalizable_vars_of_glob_constr ~bound:ids ~allowed:ids' ty' in
  let env' = List.fold_left
    (fun env {loc;v=x} -> push_name_env ~dump ntnvars [](*?*) env (make ?loc @@ Name x))
    env fvs in
  let b' = check_implicit_meaningful ?loc b' env in
  let bl = List.map
    CAst.(map (fun id ->
      (Name id, MaxImplicit, DAst.make ?loc @@ GHole (GBinderType (Name id)))))
    fvs
  in
  let na = match na with
    | Anonymous ->
      let id =
        match ty with
        | { v = CApp ({ v = CRef (qid,_) }, _) } when qualid_is_ident qid ->
          qualid_basename qid
        | _ -> default_non_dependent_ident
      in
      let ids' = List.fold_left (fun ids' lid -> Id.Set.add lid.CAst.v ids') ids' fvs in
      let id =
        Implicit_quantifiers.make_fresh ids' (Global.env ()) id
      in
      Name id
    | _ -> na
  in
  let impls = impls_type_list 1 ty' in
  (push_name_env ~dump ntnvars impls env' (make ?loc na),
   (make ?loc (na,b',ty')) :: List.rev bl)

let intern_assumption ~dump intern ntnvars env nal bk ty =
  let intern_type env = intern (restart_prod_binders (set_type_scope env)) in
  match bk with
  | Default k ->
      let ty = intern_type env ty in
      check_capture ty nal;
      let impls = impls_type_list 1 ty in
      List.fold_left
        (fun (env, bl) ({loc;v=na} as locna) ->
          let k = check_implicit_meaningful ?loc k env in
          (push_name_env ~dump ntnvars impls env locna,
           (make ?loc (na,k,locate_if_hole ?loc na ty))::bl))
        (env, []) nal
  | Generalized (b',t) ->
     let env, b = intern_generalized_binder ~dump intern_type ntnvars env (List.hd nal) b' t ty in
     env, b

let glob_local_binder_of_extended = DAst.with_loc_val (fun ?loc -> function
  | GLocalAssum (na,r,bk,t) -> (na,None,bk,None,t)
  | GLocalDef (na,r,c,Some t) -> (na,None,Explicit,Some c,t)
  | GLocalDef (na,r,c,None) ->
      let t = DAst.make ?loc @@ GHole (GBinderType na) in
      (na,None,Explicit,Some c,t)
  | GLocalPattern (_,_,_,_) ->
      Loc.raise ?loc (Gramlib.Grammar.ParseError "Pattern with quote not allowed here")
  )

let intern_cases_pattern_fwd = ref (fun _ -> failwith "intern_cases_pattern_fwd")

let intern_letin_binder ~dump intern ntnvars env (({loc;v=na} as locna),def,ty) =
  let term = intern (reset_tmp_scope (restart_lambda_binders env)) def in
  let ty = Option.map (intern (set_type_scope (restart_prod_binders env))) ty in
  let impls = impls_term_list 1 term in
  (push_name_env ~dump ntnvars impls env locna,
   (na,term,ty))

let intern_cases_pattern_as_binder ~dump intern test_kind ntnvars env bk (CAst.{v=p;loc} as pv) =
  let p,t,tmp_scope = match p with
  | CPatCast (p, t) -> (p, Some t, (* Redone later, not nice: *) Notation.compute_glob_type_scope (intern (set_type_scope env) t))
  | _ -> (pv, None, []) in
  let il,disjpat =
    let (il, subst_disjpat) = !intern_cases_pattern_fwd test_kind ntnvars (env_for_pattern {env with tmp_scope}) p in
    let substl,disjpat = List.split subst_disjpat in
    if not (List.for_all (fun subst -> Id.Map.equal Id.equal subst Id.Map.empty) substl) then
      user_err ?loc (str "Unsupported nested \"as\" clause.");
    il,disjpat
  in
  let na = alias_of_pat (List.hd disjpat) in
  let env = List.fold_right (fun {loc;v=id} env -> push_name_env ~dump ntnvars [] env (make ?loc @@ Name id)) il env in
  let ienv = Name.fold_right Id.Set.remove na env.ids in
  let id = Namegen.next_name_away_with_default "pat" na ienv in
  let na = make ?loc @@ Name id in
  let t = match t with
    | Some t -> t
    | None -> CAst.make ?loc @@ CHole (Some (GBinderType na.v)) in
  let _, bl' = intern_assumption ~dump intern ntnvars env [na] (Default bk) t in
  let {v=(_,bk,t)} = List.hd bl' in
  let il = List.map (fun id -> id.v) il in
  env,((disjpat,il),id),bk,t

let intern_local_binder_aux ~dump intern ntnvars (env,bl) = function
  | CLocalAssum(nal,_,bk,ty) ->
      let env, bl' = intern_assumption ~dump intern ntnvars env nal bk ty in
      let bl' = List.map (fun {loc;v=(na,c,t)} -> DAst.make ?loc @@ GLocalAssum (na,None,c,t)) bl' in
      env, bl' @ bl
  | CLocalDef( {loc; v=na} as locna,_,def,ty) ->
     let env,(na,def,ty) = intern_letin_binder ~dump intern ntnvars env (locna,def,ty) in
     env, (DAst.make ?loc @@ GLocalDef (na,None,def,ty)) :: bl
  | CLocalPattern p ->
      let env, ((disjpat,il),id),bk,t = intern_cases_pattern_as_binder ~dump intern test_kind_tolerant ntnvars env Explicit p in
      (env, (DAst.make ?loc:p.CAst.loc @@ GLocalPattern((disjpat,il),id,bk,t)) :: bl)

let intern_generalization intern env ntnvars loc bk c =
  let c = intern {env with strict_check = Some false} c in
  let fvs = Implicit_quantifiers.generalizable_vars_of_glob_constr ~bound:env.ids c in
  let env', c' =
    let abs =
      let pi =
        match Notation.current_type_scope_names () with
        | [] -> false
        | type_scopes ->
          let is_type_scope = match env.tmp_scope with
            | [] -> false
            | scl -> List.equal String.equal scl type_scopes
          in
          is_type_scope ||
          List.exists (fun sc -> String.List.mem sc env.scopes) type_scopes
      in
        if pi then
          (fun {loc=loc';v=id} acc ->
            DAst.make ?loc:(Loc.merge_opt loc' loc) @@
            GProd (Name id, None, bk, DAst.make ?loc:loc' @@ GHole (GBinderType (Name id)), acc))
        else
          (fun {loc=loc';v=id} acc ->
            DAst.make ?loc:(Loc.merge_opt loc' loc) @@
            GLambda (Name id, None, bk, DAst.make ?loc:loc' @@ GHole (GBinderType (Name id)), acc))
    in
      List.fold_right (fun ({loc;v=id} as lid) (env, acc) ->
        let env' = push_name_env ~dump:true ntnvars [] env CAst.(make @@ Name id) in
          (env', abs lid acc)) fvs (env,c)
  in c'

let rec expand_binders ?loc mk bl c =
  match bl with
  | [] -> c
  | b :: bl ->
     match DAst.get b with
     | GLocalDef (n, r, b, oty) ->
        expand_binders ?loc mk bl (DAst.make ?loc @@ GLetIn (n, r, b, oty, c))
     | GLocalAssum (n, _, bk, t) ->
        expand_binders ?loc mk bl (mk ?loc (n,bk,t) c)
     | GLocalPattern ((disjpat,ids), id, bk, ty) ->
        let tm = DAst.make ?loc (GVar id) in
        (* Distribute the disjunctive patterns over the shared right-hand side *)
        let eqnl = List.map (fun pat -> CAst.make ?loc (ids,[pat],c)) disjpat in
        let c = DAst.make ?loc @@ GCases (LetPatternStyle, None, [tm,(Anonymous,None)], eqnl) in
        expand_binders ?loc mk bl (mk ?loc (Name id,Explicit,ty) c)

(**********************************************************************)
(* Syntax extensions                                                  *)

let check_not_notation_variable f ntnvars =
  (* Check bug #4690 *)
  match DAst.get f with
  | GVar id when Id.Map.mem id ntnvars ->
    user_err (str "Prefix @ is not applicable to notation variables.")
  | _ ->
     ()

let option_mem_assoc id = function
  | Some (id',c) -> Id.equal id id'
  | None -> false

let find_fresh_name renaming (terms,termlists,binders,binderlists) avoid id =
  let fold1 _ (c, _) accu = Id.Set.union (free_vars_of_constr_expr c) accu in
  let fold2 _ (l, _) accu =
    let fold accu c = Id.Set.union (free_vars_of_constr_expr c) accu in
    List.fold_left fold accu l
  in
  let fold3 _ x accu = Id.Set.add x accu in
  let fvs1 = Id.Map.fold fold1 terms avoid in
  let fvs2 = Id.Map.fold fold2 termlists fvs1 in
  let fvs3 = Id.Map.fold fold3 renaming fvs2 in
  (* TODO binders *)
  next_ident_away_from id (fun id -> Id.Set.mem id fvs3)

let is_patvar c =
  match DAst.get c with
  | PatVar _ -> true
  | _ -> false

let is_patvar_store store pat =
  match DAst.get pat with
  | PatVar na -> ignore(store (CAst.make ?loc:pat.loc na)); true
  | _ -> false

let out_patvar = CAst.map_with_loc (fun ?loc -> function
  | CPatAtom (Some qid) when qualid_is_ident qid ->
    Name (qualid_basename qid)
  | CPatAtom None -> Anonymous
  | _ -> assert false)

let canonize_type = function
  | None -> None
  | Some t as t' ->
    match DAst.get t with
    | GHole (GBinderType _) -> None
    | _ -> t'

let set_type ty1 ty2 =
  match canonize_type ty1, canonize_type ty2 with
  (* Not a meta-binding binder, we use the type given in the notation *)
  | _, None -> ty1
  (* A meta-binding binder meta-bound to a possibly-typed pattern *)
  (* the binder is supposed to come w/o an explicit type in the notation *)
  | None, Some _ -> ty2
  | Some ty1, Some t2 ->
    (* An explicitly typed meta-binding binder, not supposed to be a pattern; checked in interp_notation *)
    user_err ?loc:t2.CAst.loc Pp.(str "Unexpected type constraint in notation already providing a type constraint.")

let cook_pattern ((disjpat, ids), id) =
  let store,get = set_temporary_memory () in
  let pat, na = match disjpat with
    | [pat] when is_patvar_store store pat -> let na = get () in None, na.v
    | _ -> Some ((ids,disjpat),id), Name id in
  pat, na

let extract_pattern_from_binder b =
  match DAst.get b with
  | GLocalDef _ -> user_err ?loc:b.CAst.loc (str "Local definitions not supported here.")
  | GLocalAssum (na, _, bk, t) -> None, na, bk, t
  | GLocalPattern (patl, id, bk, ty) ->
    let pat, na = cook_pattern (patl, id) in
    pat, na, bk, ty

let traverse_binder intern_pat ntnvars (terms,_,binders,_ as subst) binderopt avoid (renaming,env) na ty =
  match na with
  | Anonymous -> (renaming,env), None, Anonymous, Explicit, set_type ty None
  | Name id ->
  let test_kind = test_kind_tolerant in
  try
    (* We instantiate binder name with patterns which may be parsed as terms *)
    let pat = coerce_to_cases_pattern_expr (fst (Id.Map.find id terms)) in
    let env,pat,bk,t = intern_pat test_kind ntnvars env Explicit pat in
    let pat, na = cook_pattern pat in
    (renaming,env), pat, na, bk, set_type ty (Some t)
  with Not_found ->
  try
    (* Trying to associate a pattern *)
    let (pat,bk),(onlyident,scopes) = Id.Map.find id binders in
    let env = set_env_scopes env scopes in
    if onlyident then
      (* Do not try to interpret a variable as a constructor *)
      let na = out_patvar pat in
      let env = push_name_env ~dump:true ntnvars [] env na in
      let ty' = DAst.make @@ GHole (GBinderType na.CAst.v) in
      (renaming,env), None, na.v, bk, set_type ty (Some ty')
    else
      (* Interpret as a pattern *)
      let env,pat,bk,t = intern_pat test_kind ntnvars env bk pat in
      let pat, na = cook_pattern pat in
      (renaming,env), pat, na, bk, set_type ty (Some t)
  with Not_found ->
  if option_mem_assoc id binderopt then
    let binder = snd (Option.get binderopt) in
    let pat, na, bk, t = extract_pattern_from_binder binder in
    (renaming,env), pat, na, bk, set_type ty (Some t)
  else
    (* Binders not bound in the notation do not capture variables *)
    (* outside the notation (i.e. in the substitution) *)
    let id' = find_fresh_name renaming subst avoid id in
    let renaming = Id.Map.add id id' renaming in
    (renaming,env), None, Name id', Explicit, set_type ty None

type binder_action =
  | AddLetIn of lname * constr_expr * constr_expr option
  | AddTermIter of (constr_expr * subscopes) Names.Id.Map.t
  | AddPreBinderIter of Id.t * local_binder_expr (* A binder to be internalized *)
  | AddBinderIter of Id.t * extended_glob_local_binder (* A binder already internalized - used for generalized binders *)
  | AddNList (* Insert a ".. term .." block *)

let dmap_with_loc f n =
  CAst.map_with_loc (fun ?loc c -> f ?loc (DAst.get_thunk c)) n

let error_cannot_coerce_wildcard_term ?loc () =
  user_err ?loc Pp.(str "Cannot turn \"_\" into a term.")

let error_cannot_coerce_disjunctive_pattern_term ?loc () =
  user_err ?loc Pp.(str "Cannot turn a disjunctive pattern into a term.")

let terms_of_binders bl =
  let rec term_of_pat pt = dmap_with_loc (fun ?loc -> function
    | PatVar (Name id)   -> CRef (qualid_of_ident id, None)
    | PatVar (Anonymous) -> error_cannot_coerce_wildcard_term ?loc ()
    | PatCstr (c,l,_) ->
       let qid = qualid_of_path ?loc (Nametab.path_of_global (GlobRef.ConstructRef c)) in
       let hole = CAst.make ?loc @@ CHole (None) in
       let params = List.make (Inductiveops.inductive_nparams (Global.env()) (fst c)) hole in
       CAppExpl ((qid,None),params @ List.map term_of_pat l)) pt in
  let rec extract_variables l = match l with
    | bnd :: l ->
      let loc = bnd.loc in
      begin match DAst.get bnd with
      | GLocalAssum (Name id,_,_,_) -> (CAst.make ?loc @@ CRef (qualid_of_ident ?loc id, None)) :: extract_variables l
      | GLocalDef (Name id,_,_,_) -> extract_variables l
      | GLocalDef (Anonymous,_,_,_)
      | GLocalAssum (Anonymous,_,_,_) -> user_err Pp.(str "Cannot turn \"_\" into a term.")
      | GLocalPattern (([u],_),_,_,_) -> term_of_pat u :: extract_variables l
      | GLocalPattern ((_,_),_,_,_) -> error_cannot_coerce_disjunctive_pattern_term ?loc ()
      end
    | [] -> [] in
  extract_variables bl

let flatten_generalized_binders_if_any y l =
  match List.rev l with
  | [] -> assert false
  | l ->
     (* if l has more than one element, this means we had a generalized binder *)
     let select_iter a =
       match DAst.get a with
       | GLocalAssum (Name id,_,_,_) when Id.equal id ldots_var -> AddNList
       | _ -> AddBinderIter (y,a) in
     List.map select_iter l

let flatten_binders bl =
  let dispatch = function
    | CLocalAssum (nal,r,bk,t) -> List.map (fun na -> CLocalAssum ([na],r,bk,t)) nal
    | a -> [a] in
  List.flatten (List.map dispatch bl)

let rec adjust_env env = function
  (* We need to adjust scopes, binder blocks ... to the env expected
     at the recursive occurrence; We do an underapproximation... *)
  | NProd (_,_,c) -> adjust_env (switch_prod_binders env) c
  | NLambda (_,_,c) -> adjust_env (switch_lambda_binders env) c
  | NLetIn (_,_,_,c) -> adjust_env env c
  | NVar id when Id.equal id ldots_var -> env
  | NCast (c,_,_) -> adjust_env env c
  | NApp _ -> restart_no_binders env
  | NVar _ | NRef _ | NHole _ | NGenarg _ | NCases _ | NLetTuple _ | NIf _
  | NRec _ | NSort _ | NProj _ | NInt _ | NFloat _ | NString _ | NArray _
  | NList _ | NBinderList _ -> env (* to be safe, but restart should be ok *)

let subst_var loc intern_pat intern ntnvars binders (terms, binderopt, _terminopt) (renaming, env) id =
  (* subst remembers the delimiters stack in the interpretation *)
  (* of the notations *)
  try
    let (a,scopes) = Id.Map.find id terms in
    intern (set_env_scopes env scopes) a
  with Not_found ->
  try
    let (pat,bk),(onlyident,scopes) = Id.Map.find id binders in
    let env = set_env_scopes env scopes in
    let test_kind =
      if onlyident then test_kind_ident_in_notation
      else test_kind_pattern_in_notation in
    let env,((disjpat,ids),id),bk,_ty = intern_pat test_kind ntnvars env bk pat in
    (* TODO: use cast? *)
    match disjpat with
    | [pat] -> glob_constr_of_cases_pattern (Global.env()) pat
    | _ -> user_err Pp.(str "Cannot turn a disjunctive pattern into a term.")
  with Not_found ->
  try
    match binderopt with
    | Some (x,binder) when Id.equal x id ->
      let terms = terms_of_binders [binder] in
      assert (List.length terms = 1);
      intern env (List.hd terms)
    | _ -> raise Not_found
  with Not_found ->
    DAst.make ?loc (
      try
        GVar (Id.Map.find id renaming)
      with Not_found ->
        (* Happens for local notation joint with inductive/fixpoint defs *)
        GVar id)

let instantiate_notation_constr loc intern intern_pat ntnvars subst infos c =
  let (terms,termlists,binders,binderlists) = subst in
  (* when called while defining a notation, avoid capturing the private binders
     of the expression by variables bound by the notation (see #3892) *)
  let avoid = Id.Map.domain ntnvars in
  let rec aux (terms,binderopt,iteropt as subst') (renaming,env) c =
    let subinfos = renaming,{env with tmp_scope = []} in
    match c with
    | NVar id when Id.equal id ldots_var ->
        (* apply the pending sequence of letin, term iterator instances,
           binder iterator instances, and eventually terminator *)
        let rec aux_letin env = function
        | [],terminator,_ -> aux (terms,None,None) (renaming,env) terminator
        | AddPreBinderIter (y,binder)::rest,terminator,iter ->
           let env,binders = intern_local_binder_aux ~dump:true intern ntnvars (adjust_env env iter,[]) binder in
           let binders = flatten_generalized_binders_if_any y binders in
           aux_letin env (binders@rest,terminator,iter)
        | AddBinderIter (y,binder)::rest,terminator,iter ->
           (* [y] is the placeholder for the [binder] in [iter] *)
           aux (terms,Some (y,binder),Some (rest,terminator,iter)) (renaming,env) iter
        | AddTermIter nterms::rest,terminator,iter ->
           (* This time, the variable [y] is the placeholder for the [binder] in [iter] *)
           aux (nterms,None,Some (rest,terminator,iter)) (renaming,env) iter
        | AddLetIn (na,c,t)::rest,terminator,iter ->
           let env,(na,c,t) = intern_letin_binder ~dump:true intern ntnvars (adjust_env env iter) (na,c,t) in
           DAst.make ?loc (GLetIn (na,None,c,t,aux_letin env (rest,terminator,iter)))
        | AddNList::rest,terminator,iter ->
           DAst.make ?loc (GApp (DAst.make ?loc (GVar ldots_var), [aux_letin env (rest,terminator,iter)]))
        in
        aux_letin env (Option.get iteropt)
    | NVar id -> subst_var loc intern_pat intern ntnvars binders subst' (renaming, env) id
    | NList (x,y,iter,terminator,revert) ->
      let l,(scopt,subscopes) =
        (* All elements of the list are in scopes (scopt,subscopes) *)
        try
          let l,scopes = Id.Map.find x termlists in
          (if revert then List.rev l else l),scopes
        with Not_found ->
        try
          let (bl,(scopt,subscopes)) = Id.Map.find x binderlists in
          let env,bl' = List.fold_left (intern_local_binder_aux ~dump:true intern ntnvars) (env,[]) bl in
          terms_of_binders (if revert then bl' else List.rev bl'),([],[])
        with Not_found ->
          anomaly (Pp.str "Inconsistent substitution of recursive notation.") in
      let select_iter a =
        match a.CAst.v with
        | CRef (qid,None) when qualid_is_ident qid && Id.equal (qualid_basename qid) ldots_var -> AddNList
        | _ -> AddTermIter (Id.Map.add y (a,(scopt,subscopes)) terms) in
      let l = List.map select_iter l in
      aux (terms,None,Some (l,terminator,iter)) subinfos (NVar ldots_var)
    | NHole (knd) ->
      let knd = match knd with
      | GBinderType (Name id as na) ->
        let na =
          try (coerce_to_name (fst (Id.Map.find id terms))).v
          with Not_found ->
          try Name (Id.Map.find id renaming)
          with Not_found -> na
        in
        GBinderType na
      | _ -> knd
      in
      DAst.make ?loc @@ GHole (knd)
    | NGenarg arg ->
      let glob_of_term (c, scopes) =
        let nenv = set_env_scopes env scopes in
        let gc = intern nenv c in
        gc
      in
      let glob_of_binder ((c,_bk), (onlyident,(tmp_scope,subscopes))) =
        let nenv = {env with tmp_scope; scopes = subscopes @ env.scopes} in
        let test_kind =
          if onlyident then test_kind_ident_in_notation
          else test_kind_pattern_in_notation in
        let _,((disjpat,_),_),_,_ty = intern_pat test_kind ntnvars nenv Explicit c in
        (* TODO: use cast? *)
        match disjpat with
        | [pat] -> (glob_constr_of_cases_pattern (Global.env()) pat)
        | _ -> error_cannot_coerce_disjunctive_pattern_term ?loc:c.loc ()
      in
      let get_glob id =
        match Id.Map.find_opt id terms with
        | Some term -> Some (glob_of_term term)
        | None -> match Id.Map.find_opt id binders with
          | Some binder -> Some (glob_of_binder binder)
          | None -> None
      in
      let arg = Genintern.generic_substitute_notation ntnvars get_glob arg in
      DAst.make ?loc @@ GGenarg arg
    | NBinderList (x,y,iter,terminator,revert) ->
      (try
        (* All elements of the list are in scopes (scopt,subscopes) *)
        let (bl,(scopt,subscopes)) = Id.Map.find x binderlists in
        (* We flatten binders so that we can interpret them at substitution time *)
        let bl = flatten_binders bl in
        let bl = if revert then List.rev bl else bl in
        (* We isolate let-ins which do not contribute to the repeated pattern *)
        let l = List.map (function | CLocalDef (na,_,c,t) -> AddLetIn (na,c,t)
                                   | binder -> AddPreBinderIter (y,binder)) bl in
        (* We stack the binders to iterate or let-ins to insert *)
        aux (terms,None,Some (l,terminator,iter)) subinfos (NVar ldots_var)
      with Not_found ->
          anomaly (Pp.str "Inconsistent substitution of recursive notation."))
    | NProd (Name id, None, c') when option_mem_assoc id binderopt ->
        let binder = snd (Option.get binderopt) in
        expand_binders ?loc mkGProd [binder] (aux subst' (renaming,env) c')
    | NLambda (Name id, None, c') when option_mem_assoc id binderopt ->
        let binder = snd (Option.get binderopt) in
        expand_binders ?loc mkGLambda [binder] (aux subst' (renaming,env) c')
    | t ->
      glob_constr_of_notation_constr_with_binders ?loc
        (traverse_binder intern_pat ntnvars subst binderopt avoid) (aux subst') ~h:binder_status_fun subinfos t
  in aux (terms,None,None) infos c

(* Turning substitution coming from parsing and based on production
   into a substitution for interpretation and based on binding/constr
   distinction *)

let cases_pattern_of_id {loc;v=id} =
  CAst.make ?loc (CPatAtom (Some (qualid_of_ident ?loc id)))

let cases_pattern_of_name {loc;v=na} =
  let atom = match na with Name id -> Some (qualid_of_ident ?loc id) | Anonymous -> None in
  CAst.make ?loc (CPatAtom atom)

let cases_pattern_of_binder_as_constr a = function
  | AsAnyPattern | AsStrictPattern -> coerce_to_cases_pattern_expr a
  | AsIdent -> cases_pattern_of_id (coerce_to_id a)
  | AsName -> cases_pattern_of_name (coerce_to_name a)

let is_onlyident = function
  | AsIdent | AsName -> true
  | AsAnyPattern | AsStrictPattern -> false

let split_by_type ids (subst : constr_notation_substitution) =
  let bind id scl l s =
    match l with
    | [] -> assert false
    | a::l -> l, Id.Map.add id (a,scl) s in
  let (terms,termlists,binders,binderlists),subst =
    List.fold_left (fun ((terms,termlists,binders,binderlists),(terms',termlists',binders',binderlists')) (id,((_,scl),_,typ)) ->
    match typ with
    | NtnTypeConstr ->
       let terms,terms' = bind id scl terms terms' in
       (terms,termlists,binders,binderlists),(terms',termlists',binders',binderlists')
    | NtnTypeBinder ntn_binder_kind ->
       let onlyident,a,terms,binders =
         match ntn_binder_kind with
         | NtnBinderParsedAsConstr k ->
           let a,terms = List.sep_first terms in
           is_onlyident k, (cases_pattern_of_binder_as_constr a k, Explicit), terms, binders
         | NtnBinderParsedAsBinder ->
           let a,binders = List.sep_first binders in
           false, a, terms, binders
         | NtnBinderParsedAsSomeBinderKind k ->
           let a,binders = List.sep_first binders in
           is_onlyident k, a, terms, binders
       in
       let binders' = Id.Map.add id (a,(onlyident,scl)) binders' in
       (terms,termlists,binders,binderlists),(terms',termlists',binders',binderlists')
    | NtnTypeConstrList ->
       let termlists,termlists' = bind id scl termlists termlists' in
       (terms,termlists,binders,binderlists),(terms',termlists',binders',binderlists')
    | NtnTypeBinderList ntn_binder_kind ->
       let l,termlists,binderlists =
         match ntn_binder_kind with
         | NtnBinderParsedAsConstr k ->
           let l,termlists = List.sep_first termlists in
           List.map (fun a -> CLocalPattern (cases_pattern_of_binder_as_constr a k)) l, termlists, binderlists
         | NtnBinderParsedAsBinder | NtnBinderParsedAsSomeBinderKind _ ->
           let l,binderlists = List.sep_first binderlists in
           l, termlists, binderlists
       in
       let binderlists' = Id.Map.add id (l,scl) binderlists' in
       (terms,termlists,binders,binderlists),(terms',termlists',binders',binderlists'))
                   (subst,(Id.Map.empty,Id.Map.empty,Id.Map.empty,Id.Map.empty)) ids in
  assert (terms = [] && termlists = [] && binders = [] && binderlists = []);
  subst

let split_by_type_pat ?loc ids subst =
  let bind id (_,scopes) l s =
    match l with
    | [] -> assert false
    | a::l -> l, Id.Map.add id (a,scopes) s in
  let bind_binders id (_,scopes) l s =
    match l with
    | [] -> assert false
    | (a,Explicit)::l -> l, Id.Map.add id (a,scopes) s
    | (a,(MaxImplicit|NonMaxImplicit))::l -> user_err (str "Implicit arguments not supported.") (* shouldn't arrive *)
  in
  let (terms,termlists,binders),subst =
    List.fold_left (fun ((terms,termlists,binders),(terms',termlists')) (id,(scl,_,typ)) ->
    match typ with
    | NtnTypeConstr | NtnTypeBinder (NtnBinderParsedAsConstr _) ->
       let terms,terms' = bind id scl terms terms' in
       (terms,termlists,binders),(terms',termlists')
    | NtnTypeConstrList ->
       let termlists,termlists' = bind id scl termlists termlists' in
       (terms,termlists,binders),(terms',termlists')
    | NtnTypeBinder (NtnBinderParsedAsBinder | NtnBinderParsedAsSomeBinderKind _) ->
       let binders,terms' = bind_binders id scl binders terms' in
       (terms,termlists,binders),(terms',termlists')
    | NtnTypeBinderList _ -> error_invalid_pattern_notation ?loc ())
                   (subst,(Id.Map.empty,Id.Map.empty)) ids in
  assert (terms = [] && termlists = [] && binders = []);
  subst

let intern_notation intern env ntnvars loc ntn fullargs =
  (* Adjust to parsing of { } *)
  let ntn,fullargs = contract_curly_brackets ntn fullargs in
  (* Recover interpretation { } *)
  let ((ids,c),df) = interp_notation ?loc ntn (env.tmp_scope,env.scopes) in
  Dumpglob.dump_notation_location (ntn_loc ?loc fullargs ntn) ntn df;
  (* Dispatch parsing substitution to an interpretation substitution *)
  let subst = split_by_type ids fullargs in
  (* Instantiate the notation *)
  instantiate_notation_constr loc intern (intern_cases_pattern_as_binder ~dump:true intern) ntnvars subst (Id.Map.empty, env) c

(**********************************************************************)
(* Discriminating between bound variables and global references       *)

let string_of_ty = function
  | Inductive -> "ind"
  | Recursive -> "def"
  | Method -> "meth"
  | Variable -> "var"

let gvar (loc, id) us = match us with
  | None | Some ([],[]) -> DAst.make ?loc @@ GVar id
  | Some _ ->
    user_err ?loc  (str "Variable " ++ Id.print id ++
      str " cannot have a universe instance")

let intern_var env (ltacvars,ntnvars) namedctx loc id us =
  (* Is [id] a notation variable *)
  if Id.Map.mem id ntnvars then
    begin
      if not (Id.Map.mem id env.impls) then set_notation_var_scope ?loc id (env.tmp_scope,env.scopes) env.ntn_binding_ids ntnvars;
      gvar (loc,id) us
    end
  else
  (* Is [id] registered with implicit arguments *)
  try
    let {var_intern_typ=ty; var_uid=uid} = Id.Map.find id env.impls in
    let tys = string_of_ty ty in
    Dumpglob.dump_reference ?loc "<>" uid tys;
    gvar (loc,id) us
  with Not_found ->
  (* Is [id] bound in current term or is an ltac var bound to constr *)
  if Id.Set.mem id env.ids || Id.Set.mem id ltacvars.ltac_vars
  then
    gvar (loc,id) us
  else if Id.equal id ldots_var
  (* Is [id] the special variable for recursive notations? *)
  then if Id.Map.is_empty ntnvars
    then error_ldots_var ?loc
    else gvar (loc,id) us
  else if Id.Set.mem id ltacvars.ltac_bound then
    (* Is [id] bound to a free name in ltac (this is an ltac error message) *)
    user_err ?loc
     (str "variable " ++ Id.print id ++ str " should be bound to a term.")
  else
    (* Is [id] a goal or section variable *)
    let _ = Environ.lookup_named_ctxt id namedctx in
      try
        (* [id] a section variable *)
        (* Redundant: could be done in intern_qualid *)
        let ref = GlobRef.VarRef id in
        Dumpglob.dump_secvar ?loc id; (* this raises Not_found when not a section variable *)
        (* Someday we should stop relying on Dumglob raising exceptions *)
        DAst.make ?loc @@ GRef (ref, us)
      with e when CErrors.noncritical e ->
        (* [id] a goal variable *)
        gvar (loc,id) us

(**********************************************************************)
(* Locating reference, possibly via an abbreviation *)

let locate_reference qid =
  Smartlocate.global_of_extended_global (Nametab.locate_extended qid)

let is_global id =
  try
    let _ = locate_reference (qualid_of_ident id) in true
  with Not_found ->
    false

let dump_extended_global loc = function
  | TrueGlobal ref -> (*feedback_global loc ref;*) Dumpglob.add_glob ?loc ref
  | Abbrev sp -> Dumpglob.add_glob_kn ?loc sp

let intern_extended_global_of_qualid qid =
  let r = Nametab.locate_extended qid in dump_extended_global qid.CAst.loc r; r

let intern_reference qid =
  let r =
    try intern_extended_global_of_qualid qid
    with Not_found as exn ->
      let _, info = Exninfo.capture exn in
      Nametab.error_global_not_found ~info qid
  in
  Smartlocate.global_of_extended_global r

let intern_sort_name ~local_univs = function
  | CSProp -> GSProp
  | CProp -> GProp
  | CSet -> GSet
  | CRawType u -> GRawUniv u
  | CType qid ->
    let is_id = qualid_is_ident qid in
    let local = if not is_id then None
      else Id.Map.find_opt (qualid_basename qid) (snd local_univs.bound)
    in
    match local with
    | Some u -> GUniv u
    | None ->
      try GUniv (Univ.Level.make (Nametab.locate_universe qid))
      with Not_found ->
        if is_id && local_univs.unb_univs
        then GLocalUniv (CAst.make ?loc:qid.loc (qualid_basename qid))
        else
          CErrors.user_err ?loc:qid.loc Pp.(str "Undeclared universe " ++ pr_qualid qid ++ str".")

let intern_qvar ~local_univs = function
  | CQAnon loc -> GLocalQVar (CAst.make ?loc Anonymous)
  | CRawQVar q -> GRawQVar q
  | CQVar qid ->
    let is_id = qualid_is_ident qid in
    let local = if not is_id then None
      else Id.Map.find_opt (qualid_basename qid) (fst local_univs.bound)
    in
    match local with
    | Some u -> GQVar u
    | None ->
      try GQVar (Sorts.QVar.make_global (Nametab.Quality.locate qid))
      with Not_found ->
        if is_id && local_univs.unb_univs
        then GLocalQVar (CAst.make ?loc:qid.loc (Name (qualid_basename qid)))
        else
          CErrors.user_err ?loc:qid.loc Pp.(str "Undeclared quality " ++ pr_qualid qid ++ str".")

let intern_quality ~local_univs q =
  match q with
  | CQConstant q -> GQConstant q
  | CQualVar q -> GQualVar (intern_qvar ~local_univs q)

let intern_sort ~local_univs (q,l) =
  Option.map (intern_qvar ~local_univs) q,
  map_glob_sort_gen (List.map (on_fst (intern_sort_name ~local_univs))) l

let intern_instance ~local_univs = function
  | None -> None
  | Some (qs, us) ->
    let qs = List.map (intern_quality ~local_univs) qs in
    let us = List.map (map_glob_sort_gen (intern_sort_name ~local_univs)) us in
    Some (qs, us)

let intern_name_alias = function
  | { CAst.v = CRef(qid,u) } ->
      let r =
        try Some (intern_extended_global_of_qualid qid)
        with Not_found -> None
      in
      Option.bind r Smartlocate.global_of_extended_global |>
      Option.map (fun r -> r, intern_instance ~local_univs:empty_local_univs u)
  | _ -> None

let intern_field_ref qid =
  match
    Smartlocate.global_of_extended_global (intern_extended_global_of_qualid qid) |>
    Option.map (function
     | GlobRef.ConstRef c as x -> x, Structure.find_from_projection (Global.env ()) c
     | _ -> raise Not_found)
  with
  | exception Not_found ->
     Loc.raise ?loc:qid.loc (InternalizationError (NotAProjection qid))
  | None ->
     Loc.raise ?loc:qid.loc (InternalizationError (NotAProjection qid))
  | Some x -> x

(**********************************************************************)
(* Interpreting references                                            *)

let find_appl_head_data genv env (_,ntnvars) c =
  let loc = c.CAst.loc in
  match DAst.get c with
  | GVar id when not (Id.Map.mem id ntnvars) ->
    (try
      let {var_impls=impls; var_scopes=argsc} = Id.Map.find id env.impls in
      Some (CAst.make ?loc (GlobRef.VarRef id)), make_implicits_list impls, argsc
     with Not_found -> None, [], [])
  | GRef (ref,_) ->
    let impls = implicits_of_global ref in
    let scopes = find_arguments_scope genv ref in
    Some (CAst.make ?loc ref), impls, scopes
  | GApp (r, l) ->
    begin match DAst.get r with
    | GRef (ref,_) ->
      let n = List.length l in
      let impls = implicits_of_global ref in
      let scopes = find_arguments_scope genv ref in
      Some (CAst.make ?loc ref),
      (if n = 0 then [] else List.map (drop_first_implicits n) impls),
       List.skipn_at_best n scopes
    | _ -> None, [], []
    end
  | GProj ((cst,_), l, c) ->
      let ref = GlobRef.ConstRef cst in
      let n = List.length l + 1 in
      let impls = implicits_of_global ref in
      let scopes = find_arguments_scope genv ref in
      Some (CAst.make ?loc (GlobRef.ConstRef cst)),
      List.map (drop_first_implicits n) impls,
      List.skipn_at_best n scopes
  | _ -> None, [], []

let error_not_enough_arguments ?loc =
  user_err ?loc  (str "Abbreviation is not applied enough.")

let check_no_explicitation l =
  let is_unset (a, b) = match b with None -> false | Some _ -> true in
  let l = List.filter is_unset l in
  match l with
  | [] -> ()
  | (_, None) :: _ -> assert false
  | (_, Some {loc}) :: _ ->
    user_err ?loc  (str"Unexpected explicitation of the argument of an abbreviation.")

let find_projection_data c =
  match DAst.get c with
  | GApp (r, l) ->
    begin match DAst.get r with
    | GRef (GlobRef.ConstRef cst,us) -> Some (cst, us, l, Structure.projection_nparams (Global.env ()) cst)
    | _ -> None
    end
  | GRef (GlobRef.ConstRef cst,us) -> Some (cst, us, [], Structure.projection_nparams (Global.env ()) cst)
  | _ -> None

let glob_sort_of_level (level: glob_level) : glob_sort =
  match level with
  | UAnonymous _ as l -> None, l
  | UNamed id -> None, UNamed [id, 0]

(* Is it a global reference or a syntactic definition? *)
let intern_qualid ?(no_secvar=false) qid intern env ntnvars us args =
  let loc = qid.loc in
  match intern_extended_global_of_qualid qid with
  | TrueGlobal (GlobRef.VarRef _) when no_secvar ->
      (* Rule out section vars since these should have been found by intern_var *)
      raise Not_found
  | TrueGlobal ref -> (DAst.make ?loc @@ GRef (ref, us)), Some ref, args
  | Abbrev sp ->
      let (ids,c) = Abbreviation.find_interp sp in
      let nids = List.length ids in
      if List.length args < nids then error_not_enough_arguments ?loc;
      let args1,args2 = List.chop nids args in
      check_no_explicitation args1;
      let subst = split_by_type ids (List.map fst args1,[],[],[]) in
      let infos = (Id.Map.empty, env) in
      let c = instantiate_notation_constr loc intern (intern_cases_pattern_as_binder ~dump:true intern) ntnvars subst infos c in
      let loc = c.loc in
      let err () =
        user_err ?loc  (str "Notation " ++ pr_qualid qid
                  ++ str " cannot have a universe instance,"
                  ++ str " its expanded head does not start with a reference")
      in
      let c = match us, DAst.get c with
      | None, _ -> c
      | Some _, GRef (ref, None) -> DAst.make ?loc @@ GRef (ref, us)
      | Some _, GApp (r, arg) ->
        let loc' = r.CAst.loc in
        begin match DAst.get r with
        | GRef (ref, None) ->
          DAst.make ?loc @@ GApp (DAst.make ?loc:loc' @@ GRef (ref, us), arg)
        | _ -> err ()
        end
      | Some ([],[s]), GSort gs when Glob_ops.(glob_sort_eq glob_Type_sort gs) ->
        DAst.make ?loc @@ GSort (glob_sort_of_level s)
      | Some ([],[_old_level]), GSort _new_sort ->
        (* TODO: add old_level and new_sort to the error message *)
        user_err ?loc (str "Cannot change universe level of notation " ++ pr_qualid qid)
      | Some _, _ -> err ()
      in
      c, None, args2

let intern_qualid_for_pattern test_global intern_not qid pats =
  match Nametab.locate_extended_nowarn qid with
  | TrueGlobal g as xref ->
    test_global g;
    Nametab.is_warned_xref xref |> Option.iter (fun warn -> Nametab.warn_user_warn_xref ?loc:qid.loc warn (TrueGlobal g));
    dump_extended_global qid.loc (TrueGlobal g);
    (g, false, Some [], pats)
  | Abbrev kn as xref ->
    let filter (vars,a) =
      match a with
      | NRef (g,_) ->
        (* Convention: do not deactivate implicit arguments and scopes for further arguments *)
        test_global g;
        let () = assert (List.is_empty vars) in
        Some (g, Some [], pats)
      | NApp (NRef (g,_),[]) -> (* special case: abbreviation for @Cstr deactivates implicit arguments *)
        test_global g;
        let () = assert (List.is_empty vars) in
        Some (g, None, pats)
      | NApp (NRef (g,_),args) ->
        (* Convention: do not deactivate implicit arguments and scopes for further arguments *)
        test_global g;
        let nvars = List.length vars in
        if List.length pats < nvars then error_not_enough_arguments ?loc:qid.loc;
        let pats1,pats2 = List.chop nvars pats in
        let subst = split_by_type_pat vars (pats1,[],[]) in
        let args = List.map (intern_not subst) args in
        Some (g, Some args, pats2)
      | _ -> None in
    match Abbreviation.find_opt kn with
    | None -> raise Not_found
    | Some abbrev ->
    match filter (Abbreviation.interp abbrev) with
    | Some (g, pats1, pats2) ->
      Nametab.is_warned_xref xref
      |> Option.iter (fun warn -> Nametab.warn_user_warn_xref ?loc:qid.loc warn (Abbrev kn));
      dump_extended_global qid.loc (Abbrev kn);
      (g, true, pats1, pats2)
    | None -> raise Not_found

let warn_nonprimitive_projection =
  CWarnings.create ~name:"nonprimitive-projection-syntax" ~category:CWarnings.CoreCategories.syntax ~default:CWarnings.Disabled
    Pp.(fun f -> pr_qualid f ++ str " used as a primitive projection but is not one.")

let error_nonprojection_syntax ?loc qid =
  CErrors.user_err ?loc Pp.(pr_qualid qid ++ str" is not a projection.")

let check_applied_projection isproj realref qid =
  if isproj then
    let open GlobRef in
    let is_prim = match realref with
      | None | Some (IndRef _ | ConstructRef _ | VarRef _) -> false
      | Some (ConstRef c) ->
        if PrimitiveProjections.mem c then true
        else if Structure.is_projection c then false
        else error_nonprojection_syntax ?loc:qid.loc qid
        (* TODO check projargs, note we will need implicit argument info *)
    in
    if not is_prim then warn_nonprimitive_projection ?loc:qid.loc qid

let intern_applied_reference ~isproj intern env namedctx (_, ntnvars as lvar) us args qid =
  let loc = qid.CAst.loc in
  let us = intern_instance ~local_univs:env.local_univs us in
  if qualid_is_ident qid then
    try
      let res = intern_var env lvar namedctx loc (qualid_basename qid) us in
      check_applied_projection isproj None qid;
      res, args
    with Not_found ->
    try
      let res, realref, args2 = intern_qualid ~no_secvar:true qid intern env ntnvars us args in
      check_applied_projection isproj realref qid;
      res, args2
    with Not_found as exn ->
      (* Extra allowance for non globalizing functions *)
      if Option.default true env.strict_check || List.exists (fun (_,e) -> Option.has_some e) args
      then
        let _, info = Exninfo.capture exn in
        Nametab.error_global_not_found ~info qid
      else
        (* check_applied_projection ?? *)
        gvar (loc,qualid_basename qid) us, args
  else
    try
      let res, realref, args2 = intern_qualid qid intern env ntnvars us args in
      check_applied_projection isproj realref qid;
      res, args2
    with Not_found as exn ->
        let _, info = Exninfo.capture exn in
        Nametab.error_global_not_found ~info qid

let interp_reference vars r =
  let r,_ =
    intern_applied_reference ~isproj:false (fun _ -> error_not_enough_arguments ?loc:None)
      {ids = Id.Set.empty; strict_check = Some true; pattern_mode = false;
       local_univs = empty_local_univs;(* <- doesn't matter here *)
       tmp_scope = []; scopes = []; impls = empty_internalization_env;
       binder_block_names = None; ntn_binding_ids = Id.Set.empty}
      Environ.empty_named_context_val
      (vars, Id.Map.empty) None [] r
  in r

(**********************************************************************)
(** {5 Cases }                                                        *)

(** Intermediate type common to the patterns of the "in" and of the
    "with" clause of "match" *)

type 'a raw_cases_pattern_expr_r =
  | RCPatAlias of 'a raw_cases_pattern_expr * lname
  | RCPatCstr  of GlobRef.t * 'a raw_cases_pattern_expr list
  | RCPatAtom  of (lident * (Notation_term.tmp_scope_name list * Notation_term.scope_name list)) option
  | RCPatOr    of 'a raw_cases_pattern_expr list
and 'a raw_cases_pattern_expr = ('a raw_cases_pattern_expr_r, 'a) DAst.t

(** {6 Elementary bricks } *)

let apply_scope_env env = function
  | [] -> {env with tmp_scope = []}, []
  | sc::scl -> {env with tmp_scope = sc}, scl

let rec simple_adjust_scopes n scopes =
  (* Note: there can be less scopes than arguments but also more scopes *)
  (* than arguments because extra scopes are used in the presence of *)
  (* coercions to funclass *)
  if Int.equal n 0 then [] else match scopes with
  | [] -> [] :: simple_adjust_scopes (n-1) []
  | sc::scopes -> sc :: simple_adjust_scopes (n-1) scopes

let rec adjust_to_up l l' default =
  match l, l' with
  | l, [] -> []
  | [], l -> l
  | true::l, l' -> default :: adjust_to_up l l' default
  | false::l, y::l' -> y :: adjust_to_up l l' default

let rec adjust_to_down l l' default =
  match l, l' with
  | [], l -> []
  | true::l, l' -> adjust_to_down l l' default
  | false::l, [] -> default :: adjust_to_down l [] default
  | false::l, y::l' -> y :: adjust_to_down l l' default

let loc_of_multiple_pattern pl =
 Loc.merge_opt (cases_pattern_expr_loc (List.hd pl)) (cases_pattern_expr_loc (List.last pl))

let check_linearity loc ids =
  match List.duplicates (fun id1 id2 -> Id.equal id1.v id2.v) ids with
  | id::_ ->
      Loc.raise ?loc (InternalizationError (NonLinearPattern id.v))
  | [] ->
      ()

(* Match the number of pattern against the number of matched args *)
let check_number_of_pattern loc n l =
  let p = List.length l in
  if not (Int.equal n p) then
    Loc.raise ?loc (InternalizationError (BadPatternsNumber (n,p)))

let check_or_pat_variables loc ids idsl =
  let eq_id {v=id} {v=id'} = Id.equal id id' in
  (* Collect remaining patterns which do not have the same variables as the first pattern *)
  let idsl = List.filter (fun ids' -> not (List.eq_set eq_id ids ids')) idsl in
  match idsl with
  | ids'::_ ->
    (* Look for an [id] which is either in [ids] and not in [ids'] or in [ids'] and not in [ids] *)
    let ids'' = List.subtract eq_id ids ids' in
    let ids'' = if ids'' = [] then List.subtract eq_id ids' ids else ids'' in
    user_err ?loc
      (strbrk "The components of this disjunctive pattern must bind the same variables (" ++
       Id.print (List.hd ids'').v ++ strbrk " is not bound in all patterns).")
  | [] -> ()

let error_wrong_numarg ?loc g ~expanded ~nargs ~expected_nassums ~expected_ndecls =
  let env = Global.env() in
  match g with
  | GlobRef.ConstructRef cstr -> error_wrong_numarg_constructor ?loc env ~cstr ~expanded ~nargs ~expected_nassums ~expected_ndecls
  | GlobRef.IndRef ind -> error_wrong_numarg_inductive ?loc env ~ind ~expanded ~nargs ~expected_nassums ~expected_ndecls
  | _ -> assert false

let error_wrong_numarg_with_notation_patterns ?loc g nargs tags =
  error_wrong_numarg ?loc g ~expanded:true ~nargs
    ~expected_nassums:(List.count (fun x -> not x) tags)
    ~expected_ndecls:(List.length tags)

let check_has_letin ?loc g expanded nargs nimps tags =
  let expected_ndecls = List.length tags - nimps in
  let expected_nassums = List.count (fun x -> not x) tags - nimps in
  if nargs = expected_nassums then false
  else if nargs = expected_ndecls then true else
    error_wrong_numarg ?loc g ~expanded ~nargs ~expected_nassums ~expected_ndecls

(** Do not raise NotEnoughArguments thanks to preconditions*)
let chop_params_pattern loc ind args with_letin =
  let nparams = if with_letin
    then Inductiveops.inductive_nparamdecls (Global.env()) ind
    else Inductiveops.inductive_nparams (Global.env()) ind in
  assert (nparams <= List.length args);
  let params,args = List.chop nparams args in
  List.iter (fun c -> match DAst.get c with
    | PatVar Anonymous -> ()
    | PatVar _ | PatCstr(_,_,_) -> error_parameter_not_implicit ?loc:c.CAst.loc) params;
  args

let find_constructor_head ?loc ref =
  let open GlobRef in
  match ref with
  | ConstructRef cstr -> cstr
  | IndRef _ ->
    let error = str "There is an inductive name deep in a \"in\" clause." in
    user_err ?loc error
  | ConstRef _ | VarRef _ ->
    let error = str "This reference is not a constructor." in
    user_err ?loc error

let find_inductive_head ?loc ref =
  let open GlobRef in
  match ref with
  | IndRef ind -> ind
  | _ -> error_bad_inductive_type ?loc ()

let find_pattern_variable qid =
  if qualid_is_ident qid then qualid_basename qid
  else Loc.raise ?loc:qid.CAst.loc (InternalizationError(NotAConstructor qid))

let check_duplicate ?loc fields =
  let eq (ref1, _) (ref2, _) = qualid_eq ref1 ref2 in
  let dups = List.duplicates eq fields in
  match dups with
  | [] -> ()
  | (r, _) :: _ ->
    user_err ?loc (str "This record defines several times the field " ++
      pr_qualid r ++ str ".")

(** [sort_fields ~complete loc fields completer] expects a list
    [fields] of field assignments [f = e1; g = e2; ...], where [f, g]
    are fields of a record and [e1] are "values" (either terms, when
    interning a record construction, or patterns, when intering record
    pattern-matching). It will sort the fields according to the record
    declaration order (which is important when type-checking them in
    presence of dependencies between fields). If the parameter
    [complete] is true, we require the assignment to be complete: all
    the fields of the record must be present in the
    assignment. Otherwise the record assignment may be partial
    (in a pattern, we may match on some fields only), and we call the
    function [completer] to fill the missing fields; the returned
    field assignment list is always complete. *)
let sort_fields genv ~complete loc fields completer =
  match fields with
    | [] -> None
    | (first_field_ref, _):: _ ->
        let (first_field_glob_ref, record) = intern_field_ref first_field_ref in
        (* the number of parameters *)
        let nparams = record.Structure.nparams in
        (* the reference constructor of the record *)
        let base_constructor = GlobRef.ConstructRef (record.Structure.name,1) in
        let () = check_duplicate ?loc fields in
        let build_proj idx proj =
          if proj.Structure.proj_body = None && complete then
            (* we don't want anonymous fields *)
            user_err ?loc (str "This record contains anonymous fields.")
          else
            (idx, proj.Structure.proj_body, proj.Structure.proj_true) in
        let proj_list =
          List.map_i build_proj 1 record.Structure.projections in
        (* now we want to have all fields assignments indexed by their place in
           the constructor *)
        let rec index_fields fields remaining_projs acc =
          match fields with
            | (field_ref, field_value) :: fields ->
               let field_glob_ref,this_field_record = intern_field_ref field_ref in
               let remaining_projs, (field_index, _, regular) =
                 let the_proj = function
                   | (idx, Some glob_id, _) -> Environ.QGlobRef.equal genv field_glob_ref (GlobRef.ConstRef glob_id)
                   | (idx, None, _) -> false in
                 try CList.extract_first the_proj remaining_projs
                 with Not_found ->
                   Loc.raise ?loc (InternalizationError(ProjectionsOfDifferentRecords (record, this_field_record)))
               in
               if not regular && complete then
                 (* "regular" is false when the field is defined
                    by a let-in in the record declaration
                    (its value is fixed from other fields). *)
                 user_err ?loc  (str "No local fields allowed in a record construction.");
               Dumpglob.add_glob ?loc:field_ref.CAst.loc field_glob_ref;
               index_fields fields remaining_projs ((field_index, field_value) :: acc)
            | [] ->
               let remaining_fields =
                 let complete_field (idx, field_ref, regular) =
                   if not regular && complete then
                     (* For terms, we keep only regular fields *)
                     None
                   else
                     Some (idx, completer idx field_ref (record.Structure.name,1)) in
                 List.map_filter complete_field remaining_projs in
               List.rev_append remaining_fields acc
        in
        let unsorted_indexed_fields = index_fields fields proj_list [] in
        let sorted_indexed_fields =
          let cmp_by_index (i, _) (j, _) = Int.compare i j in
          List.sort cmp_by_index unsorted_indexed_fields in
        let sorted_fields = List.map snd sorted_indexed_fields in
        Some (nparams, base_constructor, sorted_fields)

(** {6 Manage multiple aliases} *)

type alias = {
  alias_ids : lident list;
  alias_map : Id.t Id.Map.t;
}

let empty_alias = {
  alias_ids = [];
  alias_map = Id.Map.empty;
}

  (* [merge_aliases] returns the sets of all aliases encountered at this
     point and a substitution mapping extra aliases to the first one *)
let merge_aliases aliases {loc;v=na} =
  match na with
  | Anonymous -> aliases
  | Name id ->
  let alias_ids = List.add_set (fun id1 id2 -> Id.equal id1.v id2.v) (make ?loc id) aliases.alias_ids in
  (* Note: assumes that add_set adds in front, see alias_of *)
  let alias_map = match aliases.alias_ids with
  | [] -> aliases.alias_map
  | {v=id'} :: _ -> Id.Map.add id id' aliases.alias_map
  in
  { alias_ids; alias_map; }

let alias_of als = match als.alias_ids with
  | [] -> Anonymous
  | l -> Name (List.last l).v

(** {6 Expanding notations }

    @returns a raw_case_pattern_expr :
    - no notations and syntactic definition
    - global reference and identifier instead of reference

*)

let merge_subst s1 s2 = Id.Map.fold Id.Map.add s1 s2

let product_of_cases_patterns aliases idspl =
  (* each [pl] is a disjunction of patterns over common identifiers [ids] *)
  (* We stepwise build a disjunction of patterns [ptaill] over common [ids'] *)
  List.fold_right (fun (ids,pl) (ids',ptaill) ->
    (ids @ ids',
     (* Cartesian prod of the or-pats for the nth arg and the tail args *)
     List.flatten (
       List.map (fun (subst,p) ->
         List.map (fun (subst',ptail) -> (merge_subst subst subst',p::ptail)) ptaill) pl)))
    idspl (aliases.alias_ids,[aliases.alias_map,[]])

let rec subst_pat_iterator y t = DAst.(map (function
  | RCPatAtom id as p ->
    begin match id with Some ({v=x},_) when Id.equal x y -> DAst.get t | _ -> p end
  | RCPatCstr (id,l) ->
    RCPatCstr (id,List.map (subst_pat_iterator y t) l)
  | RCPatAlias (p,a) -> RCPatAlias (subst_pat_iterator y t p,a)
  | RCPatOr pl -> RCPatOr (List.map (subst_pat_iterator y t) pl)))

let is_non_zero c = match c with
  | { CAst.v = CPrim (Number p) } -> not (NumTok.Signed.is_zero p)
  | _ -> false

let is_non_zero_pat c = match c with
  | { CAst.v = CPatPrim (Number p) } -> not (NumTok.Signed.is_zero p)
  | _ -> false

let { Goptions.get = get_asymmetric_patterns } =
  Goptions.declare_bool_option_and_ref
    ~key:["Asymmetric";"Patterns"]
    ~value:false
    ()

type global_reference_test = {
  for_ind : bool;
  test_kind : ?loc:Loc.t -> GlobRef.t -> unit
}

let drop_notations_pattern (test_kind_top,test_kind_inner) genv env pat =
  (* At toplevel, Constructors and Inductives are accepted, in recursive calls
     only constructor are allowed *)
  let ensure_kind {test_kind} ?loc g =
    try test_kind ?loc g
    with Not_found ->
      error_invalid_pattern_notation ?loc ()
  in
  (* [rcp_of_glob] : from [glob_constr] to [raw_cases_pattern_expr] *)
  let make_pars ?loc g =
    let env = Global.env () in
    let n = match g with
      | GlobRef.ConstructRef (ind,_) -> Inductiveops.inductive_nparams env ind
      | _ -> 0 in
    List.make n (DAst.make ?loc @@ RCPatAtom None)
  in
  (* Check Ind/Construct structure of patterns for primitive notation *)
  let rec check_allowed_ref_in_pat test_kind = DAst.(with_loc_val (fun ?loc -> function
      | GVar _ | GHole _ -> ()
      | GRef (g,_) -> test_kind.test_kind ?loc g
      | GApp (f, l) ->
        begin match DAst.get f with
        | GRef (g, _) ->
          test_kind.test_kind ?loc g;
          let nparams = match g with
            | IndRef ind | ConstructRef (ind,_) -> Inductiveops.inductive_nparams (Global.env ()) ind
            | _ -> assert false in
          let l = try List.skipn nparams l with Failure _ -> raise Not_found in
          List.iter (check_allowed_ref_in_pat test_kind_inner) l
        | _ -> raise Not_found
        end
      | _ -> raise Not_found)) in
  (* Interpret a primitive notation (part of Glob_ops.cases_pattern_of_glob_constr) *)
  let rec rcp_of_glob scopes x = DAst.(map_with_loc (fun ?loc -> function
    | GVar id -> RCPatAtom (Some (CAst.make ?loc id,scopes))
    | GHole _ -> RCPatAtom None
    | GRef (g,_) -> RCPatCstr (g, in_patargs ?loc scopes g ~expanded:true ~no_impl:false [] [])
    | GApp (r, l) ->
      begin match DAst.get r with
      | GRef (g,_) ->
        let allscs = find_arguments_scope genv g in
        let allscs = simple_adjust_scopes (List.length l) allscs in
        let params = make_pars ?loc g in (* Rem: no letins *)
        let nparams = List.length params in
        let allscs = List.skipn nparams allscs in
        let l = List.skipn nparams l in
        let pl = List.map2 (fun sc a -> rcp_of_glob (sc,snd scopes) a) allscs l in
        RCPatCstr (g, in_patargs ?loc scopes g ~expanded:true ~no_impl:false (params@pl) [])
      | _ ->
        CErrors.anomaly Pp.(str "Invalid return pattern from Notation.interp_prim_token_cases_pattern_expr.")
      end
    | _ -> CErrors.anomaly Pp.(str "Invalid return pattern from Notation.interp_prim_token_cases_pattern_expr."))) x
  and drop_abbrev {test_kind} ?loc scopes qid add_par_if_no_ntn_with_par no_impl pats =
    try
      if qualid_is_ident qid && Option.cata (Id.Set.mem (qualid_basename qid)) false env.pat_ids && List.is_empty pats then
        raise Not_found;
      let intern_not subst pat = in_not test_kind_inner qid.loc scopes subst [] pat in
      let g, expanded, ntnpats, pats = intern_qualid_for_pattern (test_kind ?loc) intern_not qid pats in
      match ntnpats with
      | None ->
        (* deactivate implicit *)
        let ntnpats = if add_par_if_no_ntn_with_par then make_pars ?loc g else [] in
        Some (g, in_patargs ?loc scopes g ~expanded ~no_impl:true ntnpats pats)
      | Some ntnpats ->
        let ntnpats = if add_par_if_no_ntn_with_par && ntnpats = [] then make_pars ?loc g else ntnpats in
        Some (g, in_patargs ?loc scopes g ~expanded ~no_impl ntnpats pats)
    with Not_found -> None
  and in_pat ({for_ind} as test_kind) scopes pt =
    let open CAst in
    let loc = pt.loc in
    (* The two policies implied by asymmetric pattern mode *)
    let add_par_if_no_ntn_with_par = get_asymmetric_patterns () && not for_ind in
    let no_impl = get_asymmetric_patterns () && not for_ind in
    match pt.v with
    | CPatAlias (p, id) -> DAst.make ?loc @@ RCPatAlias (in_pat test_kind scopes p, id)
    | CPatRecord l ->
      let sorted_fields =
        sort_fields genv ~complete:false loc l (fun _idx fieldname constructor -> CAst.make ?loc @@ CPatAtom None) in
      begin match sorted_fields with
        | None -> DAst.make ?loc @@ RCPatAtom None
        | Some (n, head, pl) ->
          let pars = make_pars ?loc head in
          let pats = in_patargs ?loc scopes head ~expanded:true ~no_impl:true pars pl in
          DAst.make ?loc @@ RCPatCstr(head, pats)
      end
    | CPatCstr (head, None, pl) ->
      begin
        match drop_abbrev test_kind ?loc scopes head add_par_if_no_ntn_with_par no_impl pl with
        | Some (g,pl) -> DAst.make ?loc @@ RCPatCstr(g, pl)
        | None -> Loc.raise ?loc (InternalizationError (NotAConstructor head))
      end
    | CPatCstr (qid, Some expl_pl, pl) ->
      begin
        match drop_abbrev test_kind ?loc scopes qid false true (expl_pl@pl) with
        | Some (g,pl) -> DAst.make ?loc @@ RCPatCstr (g, pl)
        | None -> Loc.raise ?loc (InternalizationError (NotAConstructor qid))
      end
    | CPatNotation (_,(InConstrEntry,"- _"),([a],[],[]),[]) when is_non_zero_pat a ->
      let p = match a.CAst.v with CPatPrim (Number (_, p)) -> p | _ -> assert false in
      let pat, _df = Notation.interp_prim_token_cases_pattern_expr ?loc
          (check_allowed_ref_in_pat test_kind) (Number (SMinus,p)) scopes in
      rcp_of_glob scopes pat
    | CPatNotation (_,(InConstrEntry,"( _ )"),([a],[],[]),[]) ->
      in_pat test_kind scopes a
    | CPatNotation (_,ntn,fullargs,extrargs) ->
      let ntn,(terms,termlists,binders) = contract_curly_brackets_pat ntn fullargs in
      let ((ids',c),df) = Notation.interp_notation ?loc ntn scopes in
      let subst = split_by_type_pat ?loc ids' (terms,termlists,binders) in
      Dumpglob.dump_notation_location (patntn_loc ?loc fullargs ntn) ntn df;
      in_not test_kind loc scopes subst extrargs c
    | CPatDelimiters (depth, key, e) ->
      let sc = find_delimiters_scope ?loc key in
      let scopes = match depth with
        | DelimOnlyTmpScope -> [sc], snd scopes
        | DelimUnboundedScope -> [], sc::snd scopes in
      in_pat test_kind scopes e
    | CPatPrim p ->
      let pat, _df = Notation.interp_prim_token_cases_pattern_expr ?loc
          (check_allowed_ref_in_pat test_kind) p scopes in
      rcp_of_glob scopes pat
    | CPatAtom (Some id) ->
      begin
        match drop_abbrev test_kind ?loc scopes id add_par_if_no_ntn_with_par no_impl [] with
        | Some (g, pl) -> DAst.make ?loc @@ RCPatCstr (g, pl)
        | None         -> DAst.make ?loc @@ RCPatAtom (Some ((make ?loc @@ find_pattern_variable id),scopes))
      end
    | CPatAtom None -> DAst.make ?loc @@ RCPatAtom None
    | CPatOr pl     -> DAst.make ?loc @@ RCPatOr (List.map (in_pat test_kind scopes) pl)
    | CPatCast (_,_) ->
      (* We raise an error if the pattern contains a cast, due to
         current restrictions on casts in patterns. Cast in patterns
         are supported only in local binders and only at for_ind level.
         The only reason they are in the [cases_pattern_expr] type
         is that the parser needs to factor the "c : t" notation
         with user defined notations. In the long term, we will try to
         support such casts everywhere, and perhaps use them to print
         the domains of lambdas in the encoding of match in constr.
         This check is here and not in the parser because it would require
         duplicating the levels of the [pattern] rule. *)
      CErrors.user_err ?loc (Pp.strbrk "Casts are not supported in this pattern.")
  and in_pat_sc scopes x = in_pat test_kind_inner (x,snd scopes)
  and in_patargs ?loc scopes
    gr (* head of the pattern *)
    ~expanded (* tell if comes from a notation (for error reporting) *)
    ~no_impl (* tell if implicit are not expected (for asymmetric patterns, or @, or {| |} *)
    ntnpats (* prefix of patterns obtained by expansion of notations or parameter insertion *)
    pats (* user given patterns *)
    =
    let default = DAst.make ?loc @@ RCPatAtom None in
    let npats = List.length pats in
    let n = List.length ntnpats in
    let ntnpats_with_letin, tags =
      let tags = match gr with
      | GlobRef.ConstructRef cstr -> constructor_alltags (Global.env()) cstr
      | GlobRef.IndRef ind -> inductive_alltags (Global.env()) ind
      | _ -> assert false in
      let ntnpats_with_letin = adjust_to_up tags ntnpats default in
      let tags =
        try List.skipn (List.length ntnpats_with_letin) tags with Failure _ ->
        error_wrong_numarg_with_notation_patterns ?loc gr (n+npats) tags in
      ntnpats_with_letin, tags in
    let imps =
      let imps =
        if no_impl then [] else
          let impls_st = implicits_of_global gr in
          if Int.equal n 0 then select_impargs_size npats impls_st
          else List.skipn_at_best n (select_stronger_impargs impls_st) in
      adjust_to_down tags imps None in
    let subscopes = adjust_to_down tags (List.skipn_at_best n (find_arguments_scope genv gr)) [] in
    let has_letin = check_has_letin ?loc gr expanded npats (List.count is_status_implicit imps) tags in
    let rec aux imps subscopes tags pats =
    match imps, subscopes, tags, pats with
    | _, _, true::tags, p::pats when has_letin ->
      in_pat_sc scopes [] p :: aux imps subscopes tags pats
    | _, _, true::tags, _ ->
      default :: aux imps subscopes tags pats
    | imp::imps, sc::subscopes, false::tags, _ when is_status_implicit imp ->
      default :: aux imps subscopes tags pats
    | imp::imps, sc::subscopes, false::tags, p::pats ->
      in_pat_sc scopes sc p :: aux imps subscopes tags pats
    | _, _, [], [] -> []
    | _ -> assert false in
    ntnpats_with_letin @ aux imps subscopes tags pats
  and in_not test_kind loc scopes (terms,termlists as fullsubst) args = function
    | NVar id ->
      begin
        (* subst remembers the delimiters stack in the interpretation *)
        (* of the notations *)
        try
          let (a,(scopt,subscopes)) = Id.Map.find id terms in
          in_pat test_kind (scopt,subscopes@snd scopes) (mkAppPattern ?loc a args)
        with Not_found ->
          if Id.equal id ldots_var then
            if List.is_empty args then
              DAst.make ?loc @@ RCPatAtom (Some ((make ?loc id),scopes))
            else
              user_err (str "Recursive notations with arguments not supported in patterns.")
          else
            anomaly (str "Unbound pattern notation variable: " ++ Id.print id ++ str ".")
      end
    | NApp (NVar id,ntnpl) ->
      user_err ?loc (str "Notations with an applied head variable not supported in patterns.")
    | NRef (g,_) ->
      ensure_kind test_kind ?loc g;
      DAst.make ?loc @@ RCPatCstr (g, in_patargs ?loc scopes g ~expanded:true ~no_impl:false [] args)
    | NApp (NRef (g,_),ntnpl) ->
      ensure_kind test_kind ?loc g;
      let ntnpl = List.map (in_not test_kind_inner loc scopes fullsubst []) ntnpl in
      let no_impl =
        (* Convention: if notation is @f, encoded as NApp(Nref g,[]), then
           implicit arguments are not inherited *)
        ntnpl = [] in
      DAst.make ?loc @@ RCPatCstr (g, in_patargs ?loc scopes g ~expanded:true ~no_impl ntnpl args)
    | NList (x,y,iter,terminator,revert) ->
      if not (List.is_empty args) then user_err ?loc
        (strbrk "Application of arguments to a recursive notation not supported in patterns.");
      (try
         (* All elements of the list are in scopes (scopt,subscopes) *)
         let (l,(scopt,subscopes)) = Id.Map.find x termlists in
         let termin = in_not test_kind_inner loc scopes fullsubst [] terminator in
         List.fold_right (fun a t ->
           let nterms = Id.Map.add y (a, (scopt, subscopes)) terms in
           let u = in_not test_kind_inner loc scopes (nterms, termlists) [] iter in
           subst_pat_iterator ldots_var t u)
           (if revert then List.rev l else l) termin
       with Not_found ->
         anomaly (Pp.str "Inconsistent substitution of recursive notation."))
    | NHole _ ->
      if not (List.is_empty args) then user_err ?loc (str "Such pattern cannot have arguments.");
      DAst.make ?loc @@ RCPatAtom None
    | NGenarg _ ->
      user_err ?loc (str "Quotations not supported in patterns.")
    | t -> error_invalid_pattern_notation ?loc ()
  in in_pat test_kind_top env.pat_scopes pat

let rec intern_pat genv ntnvars aliases pat =
  let loc = pat.loc in
  match DAst.get pat with
    | RCPatAlias (p, id) ->
      let aliases' = merge_aliases aliases id in
      intern_pat genv ntnvars aliases' p
    | RCPatCstr (head, pl) ->
      let c = find_constructor_head ?loc head in
      let idslpl = List.map (intern_pat genv ntnvars empty_alias) pl in
      let (ids',pll) = product_of_cases_patterns aliases idslpl in
      let pl' = List.map (fun (asubst,pl) ->
          (asubst, DAst.make ?loc @@ PatCstr (c,chop_params_pattern loc (fst c) pl true,alias_of aliases))) pll in
      ids',pl'
    | RCPatAtom (Some ({loc;v=id},scopes)) ->
      let aliases = merge_aliases aliases (make ?loc @@ Name id) in
      set_var_is_binder ?loc id ntnvars;
      (aliases.alias_ids,[aliases.alias_map, DAst.make ?loc @@ PatVar (alias_of aliases)]) (* TO CHECK: aura-t-on id? *)
    | RCPatAtom None ->
      let { alias_ids = ids; alias_map = asubst; } = aliases in
      (ids, [asubst, DAst.make ?loc @@ PatVar (alias_of aliases)])
    | RCPatOr pl ->
      assert (not (List.is_empty pl));
      let pl' = List.map (intern_pat genv ntnvars aliases) pl in
      let (idsl,pl') = List.split pl' in
      let ids = List.hd idsl in
      List.iter2 check_linearity (List.map (fun x -> x.CAst.loc) pl) idsl;
      check_or_pat_variables loc ids (List.tl idsl);
      (ids,List.flatten pl')

let intern_cases_pattern test_kind genv ntnvars env aliases pat =
  let test = {for_ind=false;test_kind} in
  intern_pat genv ntnvars aliases
    (drop_notations_pattern (test,test) genv env pat)

let _ =
  intern_cases_pattern_fwd :=
    fun test_kind ntnvars env p ->
    intern_cases_pattern test_kind (Global.env ()) ntnvars env empty_alias p

let intern_ind_pattern genv ntnvars env pat =
  let test_kind_top ?loc = function
    | GlobRef.IndRef _  -> ()
    | GlobRef.ConstructRef _ | GlobRef.ConstRef _ | GlobRef.VarRef _ ->
      (* A non-inductive global reference at top is an error *)
      error_invalid_pattern_notation ?loc () in
  let test_kind_inner ?loc = function
    | GlobRef.ConstructRef _ -> ()
    | GlobRef.IndRef _ | GlobRef.ConstRef _ | GlobRef.VarRef _ ->
      (* A non-constructor global reference deep in a pattern is seen as a variable *)
      raise Not_found in
  let no_not =
    try
      let test_top = {for_ind=true;test_kind=test_kind_top} in
      let test_inner = {for_ind=false;test_kind=test_kind_inner} in
      drop_notations_pattern (test_top,test_inner) genv env pat
    with InternalizationError (NotAConstructor _) as exn ->
      let _, info = Exninfo.capture exn in
      error_bad_inductive_type ~info ()
  in
  let loc = no_not.CAst.loc in
  match DAst.get no_not with
    | RCPatCstr (head, pl) ->
      let ind = find_inductive_head ?loc head in
      let idslpl = List.map (intern_pat genv ntnvars empty_alias) pl in
      (match product_of_cases_patterns empty_alias idslpl with
       | ids,[asubst,pl] -> (ind,ids,asubst,chop_params_pattern loc ind pl true)
       | _ -> error_bad_inductive_type ?loc ())
    | x -> error_bad_inductive_type ?loc ()

(**********************************************************************)
(* Utilities for application                                          *)

let get_implicit_name n imps = Impargs.name_of_implicit (List.nth imps (n-1))

let set_hole_implicit i na imp r =
  let loc, r = match r with
    | Some CAst.{loc;v} -> loc, v
    | None -> anomaly (Pp.str "Only refs have implicits.") in
  DAst.make ?loc (GHole (GImplicitArg (r,(i,na),force_inference_of imp)))

let exists_implicit_name id =
  List.exists (fun imp -> is_status_implicit imp && Id.equal id (name_of_implicit imp))

let print_allowed_named_implicit imps =
  let l = List.map_filter (function Some { impl_pos = (Name id, _, _) } -> Some id | _ -> None) imps in
  match l with
  | [] -> mt ()
  | l ->
    let n = List.length l in
    str " (possible " ++ str (String.plural n "name") ++ str ":" ++ spc () ++
    pr_sequence Id.print l ++ str ")"

let print_allowed_nondep_implicit imps =
  let l = List.map_filter (function Some { impl_pos = (_, _, Some n) } -> Some n | _ -> None) imps in
  match l with
  | [] -> mt ()
  | l ->
    let n = List.length l in
    str " (possible " ++ str (String.plural n "position") ++ str ":" ++ spc () ++
    pr_sequence Pp.int l ++ str ")"

let extract_explicit_arg imps args =
  let rec aux = function
  | [] -> [], []
  | (a,e)::l ->
      let (eargs,rargs) = aux l in
      match e with
      | None -> (eargs,a::rargs)
      | Some {loc;v=pos} ->
          let () = match pos with
          | ExplByName id ->
              if not (exists_implicit_name id imps) then
                user_err ?loc
                  (str "Wrong argument name " ++ Id.print id ++
                   print_allowed_named_implicit imps ++ str ".");
              if List.mem_assoc pos eargs then
                user_err ?loc  (str "Argument name " ++ Id.print id
                ++ str " occurs more than once.")
          | ExplByPos p ->
              if not (is_nondep_implicit p imps) then
                user_err ?loc
                  (str"Wrong argument position " ++ int p ++
                   print_allowed_nondep_implicit imps ++ str ".");
              if List.mem_assoc pos eargs then
                user_err ?loc (str"Argument at position " ++ int p ++
                  str " is mentioned more than once.") in
          ((pos,(loc,a))::eargs, rargs)
  in aux args

let extract_regular_arguments args =
  List.map_filter (function
      | (a,Some pos) -> user_err ?loc:pos.loc (str "Unexpected explicit argument.")
      | (a,None) -> Some a) args

(**********************************************************************)
(* Main loop                                                          *)

module Interner = struct

  type 'a fn = Environ.env -> intern_env -> (ltac_sign * Genintern.ntnvar_status Id.Map.t) -> ?loc:Loc.t -> 'a -> glob_constr

  type t = {
    ref : t -> (qualid * instance_expr option) fn
  ; fix : t -> (lident * fix_expr list) fn
  ; cofix : t -> (lident * cofix_expr list) fn
  ; prodn : t -> (local_binder_expr list * constr_expr) fn
  ; lambdan : t -> (local_binder_expr list * constr_expr) fn
  ; letin : t -> (lname * constr_expr * constr_expr option * constr_expr) fn
  ; appexpl : t -> ((qualid * instance_expr option) * constr_expr list) fn
  ; app : t -> (constr_expr * (constr_expr * explicitation CAst.t option) list) fn
  ; proj : t -> (explicit_flag * (qualid * instance_expr option)
              * (constr_expr * explicitation CAst.t option) list * constr_expr) fn
  ; record : t -> ((qualid * constr_expr) list) fn
  ; cases : t -> (Constr.case_style * constr_expr option * case_expr list * branch_expr list) fn
  ; lettuple : t -> (lname list * (lname option * constr_expr option) * constr_expr * constr_expr) fn
  ; if_ : t -> (constr_expr * (lname option * constr_expr option) * constr_expr * constr_expr) fn
  ; hole : t -> Evar_kinds.glob_evar_kind option fn
  ; genarg : t -> Genarg.raw_generic_argument fn
  ; genargglob : t -> Genarg.glob_generic_argument fn
  ; patvar : t -> (Pattern.patvar) fn
  ; evar : t -> (Glob_term.existential_name CAst.t * (lident * constr_expr) list) fn
  ; sort : t -> sort_expr fn
  ; cast : t -> (constr_expr * Constr.cast_kind option * constr_expr) fn
  ; notation : t -> (notation_with_optional_scope option * notation * constr_notation_substitution) fn
  ; generalization : t -> (Glob_term.binding_kind * constr_expr) fn
  ; prim : t -> prim_token fn
  ; delimiters : t -> (delimiter_depth * string * constr_expr) fn
  ; array : t -> (instance_expr option * constr_expr array * constr_expr * constr_expr) fn
  }

  let eval (self : t) genv env lvar ?loc = function
    | CRef (ref_, us) ->
      self.ref self genv env lvar ?loc (ref_, us)
    | CFix (lid, dl) ->
      self.fix self genv env lvar ?loc (lid, dl)
    | CCoFix (lid, dl) ->
      self.cofix self genv env lvar ?loc (lid, dl)
    | CProdN (bl,c2) ->
      self.prodn self genv env lvar ?loc (bl, c2)
    | CLambdaN (bl, c2) ->
      self.lambdan self genv env lvar ?loc (bl, c2)
    | CLetIn (na,c1,t,c2) ->
      self.letin self genv env lvar ?loc (na,c1,t,c2)
    | CAppExpl ((ref,us), args) ->
      self.appexpl self genv env lvar ?loc ((ref,us), args)
    | CApp (f, args) ->
      self.app self genv env lvar ?loc (f, args)
    | CProj (expl, f, args, c) ->
      self.proj self genv env lvar ?loc (expl, f, args, c)
    | CRecord fs ->
      self.record self genv env lvar ?loc fs
    | CCases (sty, rtnpo, tms, eqns) ->
      self.cases self genv env lvar ?loc (sty, rtnpo, tms, eqns)
    | CLetTuple (nal, (na,po), b, c) ->
      self.lettuple self genv env lvar ?loc (nal, (na,po), b, c)
    | CIf (c, (na,po), b1, b2) ->
      self.if_ self genv env lvar ?loc (c, (na,po), b1, b2)
    | CHole k ->
      self.hole self genv env lvar ?loc k
    | CGenarg gen ->
      self.genarg self genv env lvar ?loc gen
    | CGenargGlob gen ->
      self.genargglob self genv env lvar ?loc gen
    | CPatVar n ->
      self.patvar self genv env lvar ?loc n
    | CEvar (n, l) ->
      self.evar self genv env lvar ?loc (n, l)
    | CSort s ->
      self.sort self genv env lvar ?loc s
    | CCast (c1, k, c2) ->
      self.cast self genv env lvar ?loc (c1, k, c2)
    | CNotation (key, ntn, args) ->
      self.notation self genv env lvar ?loc (key, ntn, args)
    | CGeneralization (b, c) ->
      self.generalization self genv env lvar ?loc (b, c)
    | CPrim p ->
      self.prim self genv env lvar ?loc p
    | CDelimiters (depth, key, e) ->
      self.delimiters self genv env lvar ?loc (depth, key, e)
    | CArray (u,t,def,ty) ->
      self.array self genv env lvar ?loc (u,t,def,ty)

end

let smart_gapp f loc = function
  | [] -> f
  | l ->
    let loc' = f.CAst.loc in
    match DAst.get f with
    | GApp (g, args) -> DAst.make ?loc:(Loc.merge_opt loc' loc) @@ GApp (g, args@l)
    | _ -> DAst.make ?loc:(Loc.merge_opt (loc_of_glob_constr f) loc) @@ GApp (f, l)

let intern self genv lvar c = CAst.with_loc_val (fun ?loc ->
    Interner.eval self genv lvar ?loc c)

let intern_type self genv env = intern self genv (set_type_scope env)

let intern_type_no_implicit self genv env = intern self genv (restart_no_binders (set_type_scope env))

let intern_no_implicit self genv env = intern self genv (restart_no_binders env)

let intern_restart_binders self genv env = intern self genv (restart_lambda_binders env)

let intern_type_restart_binders self genv env = intern self genv (restart_prod_binders (set_type_scope env))

let rec intern_args self genv env lvar subscopes = function
  | [] -> []
  | a::args ->
    let (enva,subscopes) = apply_scope_env env subscopes in
    let a = intern_no_implicit self genv enva lvar a in
    a :: intern_args self genv env lvar subscopes args

let apply_args self genv env lvar loc hd args =
  let _, _, subscopes = find_appl_head_data genv env lvar hd in
  smart_gapp hd loc (intern_args self genv env lvar subscopes args)

let intern_impargs self genv env lvar head allimps subscopes args =
  let eargs, rargs = extract_explicit_arg allimps args in
  if !parsing_explicit then
    if List.is_empty eargs then intern_args self genv env lvar subscopes rargs
    else user_err Pp.(str "Arguments given by name or position not supported in explicit mode.")
  else
    let rec aux n imps subscopes eargs rargs =
      let (enva,subscopes') = apply_scope_env env subscopes in
      match (imps,rargs) with
      | (imp::imps', rargs) when is_status_implicit imp ->
          begin try
            let eargs',(_,(_,a)) = List.extract_first (fun (pos,a) -> match_implicit imp pos) eargs in
            intern_no_implicit self genv enva lvar a :: aux (n+1) imps' subscopes' eargs' rargs
          with Not_found ->
          if List.is_empty rargs && List.is_empty eargs && not (maximal_insertion_of imp) then
            (* Less regular arguments than expected: complete *)
            (* with implicit arguments if maximal insertion is set *)
            []
          else
            set_hole_implicit n (get_implicit_name n allimps) imp head :: aux (n+1) imps' subscopes' eargs rargs
          end
      | (imp::impl', a::rargs') ->
          intern_no_implicit self genv enva lvar a :: aux (n+1) impl' subscopes' eargs rargs'
      | (imp::impl', []) ->
          if not (List.is_empty eargs) then
            (let pr_position = function ExplByName id -> Id.print id | ExplByPos n -> str "position " ++ int n in
             let (pos,(loc,_)) = List.hd eargs in
             user_err ?loc (str "Not enough non implicit \
                                 arguments to accept the argument bound to " ++
                            pr_position pos ++ str"."));
          []
      | ([], rargs) ->
          assert (List.is_empty eargs);
          intern_args self genv env lvar subscopes rargs
    in aux 1 allimps subscopes eargs rargs

let apply_impargs self genv env lvar loc c args =
  let head, impls, subscopes = find_appl_head_data genv env lvar c in
  let imps = select_impargs_size (List.length (List.filter (fun (_,x) -> x == None) args)) impls in
  let args = intern_impargs self genv env lvar head imps subscopes args in
  smart_gapp c loc args

let intern_local_binder self genv env lvar bind : intern_env * Glob_term.extended_glob_local_binder list =
  let intern env = intern self genv env lvar in
  intern_local_binder_aux ~dump:true intern (snd lvar) env bind

(* Expands a multiple pattern into a disjunction of multiple patterns *)
let intern_multiple_pattern genv env ntnvars n pl =
  let env = { pat_ids = None; pat_scopes = ([],env.scopes) } in
  let idsl_pll = List.map (intern_cases_pattern test_kind_tolerant genv ntnvars env empty_alias) pl in
  let loc = loc_of_multiple_pattern pl in
  check_number_of_pattern loc n pl;
  product_of_cases_patterns empty_alias idsl_pll

(* Expands a disjunction of multiple pattern *)
let intern_disjunctive_multiple_pattern genv env ntnvars loc n mpl =
  assert (not (List.is_empty mpl));
  let mpl' = List.map (intern_multiple_pattern genv env ntnvars n) mpl in
  let (idsl,mpl') = List.split mpl' in
  let ids = List.hd idsl in
  List.iter2 check_linearity (List.map loc_of_multiple_pattern mpl) idsl;
  check_or_pat_variables loc ids (List.tl idsl);
  (ids,List.flatten mpl')

(* Expands a pattern-matching clause [lhs => rhs] *)
let intern_eqn self genv env (_, ntnvars as lvars) n {loc;v=(lhs,rhs)} =
  let eqn_ids,pll = intern_disjunctive_multiple_pattern genv env ntnvars loc n lhs in
  (* Linearity implies the order in ids is irrelevant *)
  let eqn_ids = List.map (fun x -> x.v) eqn_ids in
  let env_ids = List.fold_right Id.Set.add eqn_ids env.ids in
  List.map (fun (asubst,pl) ->
      let rhs = replace_vars_constr_expr asubst rhs in
      let rhs' = intern_no_implicit self genv {env with ids = env_ids} lvars rhs in
      CAst.make ?loc (eqn_ids,pl,rhs')) pll

let intern_case_item self genv env lvar forbidden_names_for_gen (tm,na,t) =
  (* the "match" part *)
  let tm' = intern_no_implicit self genv env lvar tm in
  (* the "as" part *)
  let extra_id,na =
    let loc = tm'.CAst.loc in
    match DAst.get tm', na with
    | GVar id, None when not (Id.Map.mem id (snd lvar)) -> Some id, CAst.make ?loc @@ Name id
    | GRef (GlobRef.VarRef id, _), None -> Some id, CAst.make ?loc @@ Name id
    | _, None -> None, CAst.make Anonymous
    | _, Some ({ CAst.loc; v = na } as lna) -> None, lna in
  (* the "in" part *)
  let match_td,typ = match t with
    | Some t ->
      let (ind,ind_ids,alias_subst,l) =
        intern_ind_pattern genv (snd lvar) (env_for_pattern (set_type_scope env)) t in
      let (mib,mip) = Inductive.lookup_mind_specif genv ind in
      let nparams = (List.length (mib.Declarations.mind_params_ctxt)) in
      (* for "in Vect n", we answer (["n","n"],[(loc,"n")])

         for "in Vect (S n)", we answer ((match over "m", relevant branch is "S
         n"), abstract over "m") = ([("m","S n")],[(loc,"m")]) where "m" is
         generated from the canonical name of the inductive and outside of
         {forbidden_names_for_gen} *)
      let (match_to_do,nal) =
        let rec canonize_args case_rel_ctxt arg_pats forbidden_names match_acc var_acc =
          let add_name l = function
            | { CAst.v = Anonymous } -> l
            | { CAst.loc; v = (Name y as x) } -> (y, DAst.make ?loc @@ PatVar x) :: l in
          match case_rel_ctxt,arg_pats with
          | [],[] ->
            (add_name match_acc na, var_acc)
          | (LocalAssum (cano_name,ty) | LocalDef (cano_name,_,ty)) :: t, c::tt ->
            begin match DAst.get c with
            | PatVar x ->
              let loc = c.CAst.loc in
              canonize_args t tt forbidden_names
                (add_name match_acc CAst.(make ?loc x)) (CAst.make ?loc x::var_acc)
            | _ ->
              let fresh =
                Namegen.next_name_away_with_default_using_types genv (Evd.from_env genv)
                  "iV" cano_name.binder_name forbidden_names (EConstr.of_constr ty) in
              canonize_args t tt (Id.Set.add fresh forbidden_names)
                ((fresh,c)::match_acc) ((CAst.make ?loc:(cases_pattern_loc c) @@ Name fresh)::var_acc)
            end
          | _ -> assert false in
        let _,args_rel =
          List.chop nparams (List.rev mip.Declarations.mind_arity_ctxt) in
        canonize_args args_rel l forbidden_names_for_gen [] [] in
      (Id.Set.of_list (List.map (fun id -> id.CAst.v) ind_ids),alias_subst,match_to_do),
      Some (CAst.make ?loc:(cases_pattern_expr_loc t) (ind,List.rev_map (fun x -> x.v) nal))
    | None ->
      (Id.Set.empty,Id.Map.empty,[]), None in
  (tm',(na.CAst.v, typ)), extra_id, match_td

let intern_proj self genv env lvar ?loc expl (qid,us) args1 c args2 =
  let intern env = intern self genv env lvar in
  let f,args1 =
    intern_applied_reference ~isproj:true intern env
      (Environ.named_context_val genv) lvar us args1 qid
  in
  match find_projection_data f with
  | Some (p, us, args0, nexpectedparams) ->
    (* A reference registered as projection *)
    check_not_notation_variable f (snd lvar);
    let head, impls, subscopes = find_appl_head_data genv env lvar f in
    let imps1, imps2 =
      if expl then
        [], []
      else
        let ngivenparams = List.length args0 + List.count (fun (_,x) -> Option.is_empty x) args1 in
        let nextraargs = List.length args2 in
        match select_impargs_size_for_proj ~nexpectedparams ~ngivenparams ~nextraargs impls with
        | Inl (imps1,imps2) -> (imps1,imps2)
        | Inr l ->
          let l = Lazy.force l in
          let n = match l with [n] -> n | _ -> 2 in (* singular only when l = [1] *)
          user_err ?loc:qid.CAst.loc (str "Projection " ++ pr_qualid qid ++ str " expected " ++ pr_choice int l ++
                                      str (String.plural n " explicit parameter") ++ str ".")
    in
    let subscopes1, subscopes2 = try List.chop (nexpectedparams + 1) subscopes with Failure _ -> subscopes, [] in
    let c,args1 = List.sep_last (intern_impargs self genv env lvar head imps1 subscopes1 (args1@[c,None])) in
    let p = DAst.make ?loc (GProj ((p,us),args0@args1,c)) in
    let args2 = intern_impargs self genv env lvar head imps2 subscopes2 args2 in
    smart_gapp p loc args2
  | None ->
    (* Tolerate a use of t.(f) notation for an ordinary application until a decision is taken about it *)
    if expl then intern env (CAst.make ?loc (CAppExpl ((qid,us), List.map fst args1@c::List.map fst args2)))
    else intern env (CAst.make ?loc (CApp ((CAst.make ?loc:qid.CAst.loc (CRef (qid,us))), args1@(c,None)::args2)))

let ref self genv env lvar ?loc (ref, us) =
  let intern env = intern self genv env lvar in
  let c,_ =
    intern_applied_reference ~isproj:false intern env (Environ.named_context_val genv)
      lvar us [] ref
  in
  apply_impargs self genv env lvar loc c []

let fix self genv env (_, ntnvars as lvar) ?loc ({ CAst.loc = locid; v = iddef}, dl) =
  let intern env = intern self genv env lvar in
  let intern_type env = intern_type self genv env lvar in
  let lf = List.map (fun ({CAst.v = id},_,_,_,_,_) -> id) dl in
  let dl = Array.of_list dl in
  let n =
    try List.index0 Id.equal iddef lf
    with Not_found as exn ->
      let _, info = Exninfo.capture exn in
      let info = Option.cata (Loc.add_loc info) info locid in
      Exninfo.iraise (InternalizationError (UnboundFixName (false,iddef)),info)
  in
  let env = restart_lambda_binders env in
  let idl_temp = Array.map
      (fun (id,_,recarg,bl,ty,_) ->
         let recarg = Option.map (function { CAst.v = v; loc } -> match v with
             | CStructRec i -> i
             | _ -> user_err ?loc Pp.(str "Well-founded induction requires Program Fixpoint or Function.")) recarg
         in
         let intern_local_binder env = intern_local_binder self genv env lvar in
         let (env',bl) = List.fold_left intern_local_binder (env,[]) bl in
         let bl = List.rev_map glob_local_binder_of_extended bl in
         let n = Option.map (fun recarg ->
             let exception Found of int in
             try
               List.fold_left (fun n (id,_,_,body,_) ->
                   match body, Name.equal id (Name recarg.v) with
                   | None, true -> raise (Found n)
                   | Some _, true ->
                     CErrors.user_err ?loc
                       (Name.print id ++ str" must be a proper parameter and not a local definition.")
                   | None, false -> n + 1
                   | Some _, false -> n (* let-ins don't count *))
                 0 bl |> ignore;
               CErrors.user_err ?loc:recarg.loc
                 (str "No parameter named " ++ Id.print recarg.v ++ str".");
             with
               Found k -> k)
             recarg
         in
         let bl_impls = remember_binders_impargs env' bl in
         (n, bl, intern_type env' ty, bl_impls)) dl in
  (* We add the recursive functions to the environment *)
  let env_rec = List.fold_left_i (fun i en name ->
      let (_,bli,tyi,_) = idl_temp.(i) in
      let binder_index,fix_args = impls_binder_list 1 bli in
      let impls = impls_type_list ~args:fix_args binder_index tyi in
      push_name_env ~dump:true ntnvars impls en (CAst.make @@ Name name)) 0 env lf in
  let idl = Array.map2 (fun (_,_,_,_,_,bd) (n,bl,ty,before_impls) ->
      (* We add the binders common to body and type to the environment *)
      let env_body = restore_binders_impargs env_rec before_impls in
      (n,bl,ty,intern {env_body with tmp_scope = []} bd)) dl idl_temp in
  DAst.make ?loc @@
  GRec (GFix
          (Array.map (fun (ro,_,_,_) -> ro) idl,n),
        Array.of_list lf,
        Array.map (fun (_,bl,_,_) -> bl) idl,
        Array.map (fun (_,_,ty,_) -> ty) idl,
        Array.map (fun (_,_,_,bd) -> bd) idl)

let cofix self genv env (_, ntnvars as lvar) ?loc ({ CAst.loc = locid; v = iddef }, dl) =
  let intern env = intern self genv env lvar in
  let intern_type env = intern_type self genv env lvar in
  let lf = List.map (fun ({CAst.v = id},_,_,_,_) -> id) dl in
  let dl = Array.of_list dl in
  let n =
    try List.index0 Id.equal iddef lf
    with Not_found as exn ->
      let _, info = Exninfo.capture exn in
      let info = Option.cata (Loc.add_loc info) info locid in
      Exninfo.iraise (InternalizationError (UnboundFixName (true,iddef)), info)
  in
  let env = restart_lambda_binders env in
  let idl_tmp = Array.map
      (fun ({ CAst.loc; v = id },_,bl,ty,_) ->
         let intern_local_binder env = intern_local_binder self genv env lvar in
         let (env',rbl) = List.fold_left intern_local_binder (env,[]) bl in
         let bl = List.rev (List.map glob_local_binder_of_extended rbl) in
         let bl_impls = remember_binders_impargs env' bl in
         (bl,intern_type env' ty,bl_impls)) dl in
  let env_rec = List.fold_left_i (fun i en name ->
      let (bli,tyi,_) = idl_tmp.(i) in
      let binder_index,cofix_args = impls_binder_list 1 bli in
      push_name_env ~dump:true ntnvars (impls_type_list ~args:cofix_args binder_index tyi)
        en (CAst.make @@ Name name)) 0 env lf in
  let idl = Array.map2 (fun (_,_,_,_,bd) (b,c,bl_impls) ->
      (* We add the binders common to body and type to the environment *)
      let env_body = restore_binders_impargs env_rec bl_impls in
      (b,c,intern {env_body with tmp_scope = []} bd)) dl idl_tmp in
  DAst.make ?loc @@
  GRec (GCoFix n,
        Array.of_list lf,
        Array.map (fun (bl,_,_) -> bl) idl,
        Array.map (fun (_,ty,_) -> ty) idl,
        Array.map (fun (_,_,bd) -> bd) idl)

let prodn self genv env lvar ?loc (bl,c2) =
  let intern_type env = intern_type self genv env lvar in
  let intern_local_binder env = intern_local_binder self genv env lvar in
  match bl with
  | [] ->
    anomaly (Pp.str "The AST is malformed, found prod without binders.")
  | bl ->
    let (env',bl) = List.fold_left intern_local_binder (switch_prod_binders env,[]) bl in
    expand_binders ?loc mkGProd bl (intern_type env' c2)

let lambdan self genv env lvar ?loc (bl, c2) =
  let intern env = intern self genv env lvar in
  let intern_local_binder env = intern_local_binder self genv env lvar in
  match bl with
  | [] ->
    anomaly (Pp.str "The AST is malformed, found lambda without binders.")
  | bl ->
    let (env',bl) = List.fold_left intern_local_binder (reset_tmp_scope (switch_lambda_binders env),[]) bl in
    expand_binders ?loc mkGLambda bl (intern env' c2)

let letin self genv env lvar ?loc (na,c1,t,c2) =
  let inc1 = intern_restart_binders self genv (reset_tmp_scope env) lvar c1 in
  let int = Option.map (intern_type_restart_binders self genv env lvar) t in
  DAst.make ?loc @@
  GLetIn (na.CAst.v, None, inc1, int,
          intern_restart_binders self genv (push_name_env ~dump:true (snd lvar) (impls_term_list 1 inc1) env na) lvar c2)

let appexpl self genv env lvar ?loc ((ref,us), args) =
  let intern env = intern self genv env lvar in
  let f,args =
    let args = List.map (fun a -> (a,None)) args in
    intern_applied_reference ~isproj:false intern env (Environ.named_context_val genv)
      lvar us args ref
  in
  check_not_notation_variable f (snd lvar);
  (* Rem: GApp(_,f,[]) stands for @f *)
  if args = [] then DAst.make ?loc @@ GApp (f,[])
  else apply_args self genv env lvar loc f (List.map fst args)

let app self genv env lvar ?loc (f, args) =
  let intern env = intern self genv env lvar in
  let apply_impargs env = apply_impargs self genv env lvar in
  let apply_args env = apply_args self genv env lvar in
  begin match f.CAst.v with
  (* t.(f args') args *)
  | CProj (expl, (ref,us), args', c) ->
    intern_proj self genv env lvar ?loc:f.CAst.loc expl (ref,us) args' c args
  | CRef (ref,us) ->
    let f, args = intern_applied_reference ~isproj:false intern env
        (Environ.named_context_val genv) lvar us args ref in
    apply_impargs env loc f args
  | CNotation (_,ntn,ntnargs) ->
    let c = intern_notation intern env (snd lvar) loc ntn ntnargs in
    apply_impargs env loc c args
  | _ ->
    let f = intern_no_implicit self genv env lvar f in
    let args = extract_regular_arguments args in
    apply_args env loc f args
  end

let proj self genv env lvar ?loc (expl, f, args, c) =
  intern_proj self genv env lvar ?loc expl f args c []

let record self genv env lvar ?loc fs =
  let st = Evar_kinds.Define (not (Program.get_proofs_transparency ())) in
  let fields =
    sort_fields genv ~complete:true loc fs
      (fun _idx fieldname constructorname ->
         let open Evar_kinds in
         let fieldinfo : Evar_kinds.record_field =
           {fieldname=Option.get fieldname; recordname=inductive_of_constructor constructorname}
         in
         CAst.make ?loc @@ CHole (Some
                                    (GQuestionMark { Evar_kinds.default_question_mark with
                                                     Evar_kinds.qm_obligation=st;
                                                     Evar_kinds.qm_record_field=Some fieldinfo
                                                   })))
  in
  begin
    match fields with
    | None -> user_err ?loc (str"No constructor inference.")
    | Some (n, constrname, args) ->
      let hd = DAst.make @@ GRef (constrname,None) in
      let pars = List.make n (CAst.make ?loc @@ CHole (None)) in
      apply_args self genv env lvar loc hd (List.rev_append pars args)
  end

let cases self genv env lvar ?loc (sty, rtnpo, tms, eqns) =
  let intern_type env = intern_type self genv env lvar in
  let as_in_vars = List.fold_left (fun acc (_,na,inb) ->
      (Option.fold_left (fun acc { CAst.v = y } -> Name.fold_right Id.Set.add y acc) acc na))
      Id.Set.empty tms in
  (* as, in & return vars *)
  let forbidden_vars = Option.cata free_vars_of_constr_expr as_in_vars rtnpo in
  let tms,ex_ids,aliases,match_from_in = List.fold_right
      (fun citm (inds,ex_ids,asubst,matchs) ->
         let ((tm,ind),extra_id,(ind_ids,alias_subst,match_td)) =
           intern_case_item self genv env lvar forbidden_vars citm in
         (tm,ind)::inds,
         Id.Set.union ind_ids (Option.fold_right Id.Set.add extra_id ex_ids),
         merge_subst alias_subst asubst,
         List.rev_append match_td matchs)
      tms ([],Id.Set.empty,Id.Map.empty,[]) in
  let env' = Id.Set.fold
      (fun var bli -> push_name_env ~dump:true (snd lvar) [] bli (CAst.make @@ Name var))
      (Id.Set.union ex_ids as_in_vars)
      (restart_lambda_binders env)
  in
  (* PatVars before a real pattern do not need to be matched *)
  let stripped_match_from_in =
    let rec aux = function
      | [] -> []
      | (_, c) :: q when is_patvar c -> aux q
      | l -> l
    in aux match_from_in in
  let rtnpo = Option.map (replace_vars_constr_expr aliases) rtnpo in
  let rtnpo = match stripped_match_from_in with
    | [] -> Option.map (intern_type (slide_binders env')) rtnpo (* Only PatVar in "in" clauses *)
    | l ->
      (* Build a return predicate by expansion of the patterns of the "in" clause *)
      let thevars, thepats = List.split l in
      let sub_rtn = (* Some (GSort (Loc.ghost,GType None)) *) None in
      let sub_tms = List.map (fun id -> (DAst.make @@ GVar id),(Name id,None)) thevars (* "match v1,..,vn" *) in
      let main_sub_eqn = CAst.make @@
        ([],thepats, (* "|p1,..,pn" *)
         Option.cata (intern_type_no_implicit self genv env' lvar)
           (DAst.make ?loc @@ GHole (GCasesType))
           rtnpo) (* "=> P" if there were a return predicate P, and "=> _" otherwise *) in
      let catch_all_sub_eqn =
        if List.for_all (irrefutable genv) thepats then [] else
          [CAst.make @@ ([],List.make (List.length thepats) (DAst.make @@ PatVar Anonymous), (* "|_,..,_" *)
                         DAst.make @@ GHole(GImpossibleCase))]   (* "=> _" *) in
      Some (DAst.make @@ GCases(RegularStyle,sub_rtn,sub_tms,main_sub_eqn::catch_all_sub_eqn))
  in
  let eqns' = List.map (intern_eqn self genv env lvar (List.length tms)) eqns in
  DAst.make ?loc @@
  GCases (sty, rtnpo, tms, List.flatten eqns')

let lettuple self genv env lvar ?loc (nal, (na,po), b, c) =
  let intern env = intern self genv env lvar in
  let intern_type env = intern_type self genv env lvar in
  let env' = reset_tmp_scope env in
  (* "in" is None so no match to add *)
  let ((b',(na',_)),_,_) = intern_case_item self genv env' lvar Id.Set.empty (b,na,None) in
  let p' = Option.map (fun u ->
      let env'' = push_name_env ~dump:true (snd lvar) [] env'
          (CAst.make na') in
      intern_type (slide_binders env'') u) po in
  DAst.make ?loc @@
  GLetTuple (List.map (fun { CAst.v } -> v) nal, (na', p'), b',
             intern (List.fold_left (push_name_env ~dump:true (snd lvar) []) env nal) c)

let if_ self genv env lvar ?loc (c, (na,po), b1, b2) =
  let intern env = intern self genv env lvar in
  let intern_type env = intern_type self genv env lvar in
  let env' = reset_tmp_scope env in
  let ((c',(na',_)),_,_) = intern_case_item self genv env' lvar Id.Set.empty (c,na,None) in (* no "in" no match to ad too *)
  let p' = Option.map (fun p ->
      let env'' = push_name_env ~dump:true (snd lvar) [] env
          (CAst.make na') in
      intern_type (slide_binders env'') p) po in
  DAst.make ?loc @@
  GIf (c', (na', p'), intern env b1, intern env b2)

let hole self genv env lvar ?loc k =
  let k = match k with
    | None ->
      let st = Evar_kinds.Define (not (Program.get_proofs_transparency ())) in
      GQuestionMark { Evar_kinds.default_question_mark with Evar_kinds.qm_obligation=st; }
    | Some k -> k
  in
  DAst.make ?loc @@
  GHole k

let genarg self genv env lvar ?loc gen =
  let (ltacvars, ntnvars) = lvar in
  (* Preventively declare notation variables in ltac as non-bindings *)
  Id.Map.iter (fun x status -> status.Genintern.ntnvar_used_as_binder <- false) ntnvars;
  let extra = ltacvars.ltac_extra in
  (* We inform ltac that the interning vars and the notation vars are bound *)
  (* but we could instead rely on the "intern_sign" *)
  let lvars = Id.Set.union ltacvars.ltac_bound ltacvars.ltac_vars in
  let lvars = Id.Set.union lvars (Id.Map.domain ntnvars) in
  let ltacvars = Id.Set.union lvars env.ids in
  (* Propagating enough information for mutual interning with tac-in-term *)
  let intern_sign = {
    Genintern.intern_ids = env.ids;
    Genintern.notation_variable_status = ntnvars
  } in
  let ist = {
    Genintern.genv;
    ltacvars;
    extra;
    intern_sign;
    strict_check = match env.strict_check with None -> false | Some b -> b;
  } in
  let intern = if env.pattern_mode
    then Genintern.generic_intern_pat ?loc
    else Genintern.generic_intern
  in
  let (_, glb) = intern ist gen in
  DAst.make ?loc @@
  GGenarg glb

let genargglob self genv env lvar ?loc gen =
  DAst.make ?loc @@ GGenarg gen

(* Parsing pattern variables *)
let patvar self genv env lvar ?loc n =
  if env.pattern_mode then
    DAst.make ?loc @@
    GPatVar (Evar_kinds.SecondOrderPatVar n)
  else
    Loc.raise ?loc (InternalizationError IllegalMetavariable)

let evar self genv env lvar ?loc (n, l) =
  match l with
  | [] when env.pattern_mode ->
    DAst.make ?loc @@
    GPatVar (Evar_kinds.FirstOrderPatVar n.CAst.v)
  | l ->
    DAst.make ?loc @@
    GEvar (n, List.map (on_snd (intern_no_implicit self genv env lvar)) l)

let sort self genv env lvar ?loc s =
  DAst.make ?loc @@
  GSort (intern_sort ~local_univs:env.local_univs s)

let cast self genv env lvar ?loc (c1, k, c2) =
  let intern env = intern self genv env lvar in
  let intern_type env = intern_type self genv env lvar in
  let c2 = intern_type (slide_binders env) c2 in
  let sc = Notation.compute_glob_type_scope c2 in
  let env' = {env with tmp_scope = sc @ env.tmp_scope} in
  let c1 = intern env' c1 in
  DAst.make ?loc @@
  GCast (c1, k, c2)

let notation self genv env lvar ?loc (_, ntn, args) =
  let intern env = intern self genv env lvar in
  match ntn, args with
  | (InConstrEntry,"- _"), ([a],[],[],[]) when is_non_zero a ->
    let p = match a.CAst.v with CPrim (Number (_, p)) -> p | _ -> assert false in
    intern env (CAst.make ?loc @@ CPrim (Number (SMinus,p)))
  | (InConstrEntry,"( _ )"), ([a],[],[],[]) ->
    intern env a
  | ntn, args ->
    let c = intern_notation intern env (snd lvar) loc ntn args in
    apply_impargs self genv env lvar loc c []

let generalization self genv env lvar ?loc (b, c) =
  let intern env = intern self genv env lvar in
  intern_generalization intern env (snd lvar) loc b c

let prim self genv env lvar ?loc p =
  let c = fst (Notation.interp_prim_token ?loc p (env.tmp_scope,env.scopes)) in
  apply_impargs self genv env lvar loc c []

let delimiters self genv env lvar ?loc (depth, key, e) =
  let intern env = intern self genv env lvar in
  let sc = find_delimiters_scope ?loc key in
  let env = match depth with
    | DelimOnlyTmpScope -> {env with tmp_scope = [sc]}
    | DelimUnboundedScope -> {env with tmp_scope = []; scopes = sc :: env.scopes} in
  intern env e

let array self genv env lvar ?loc (u,t,def,ty) =
  let intern env = intern self genv env lvar in
  DAst.make ?loc @@ GArray(intern_instance ~local_univs:env.local_univs u, Array.map (intern env) t, intern env def, intern env ty)

let default : Interner.t =
  { ref
  ; fix
  ; cofix
  ; prodn
  ; lambdan
  ; letin
  ; appexpl
  ; app
  ; proj
  ; record
  ; cases
  ; lettuple
  ; if_
  ; hole
  ; genarg
  ; genargglob
  ; patvar
  ; evar
  ; sort
  ; cast
  ; notation
  ; generalization
  ; prim
  ; delimiters
  ; array
  }

let internalize genv env lvar c =
  NewProfile.profile "intern" (fun () -> intern default genv env lvar c) ()

(**************************************************************************)
(* Functions to translate constr_expr into glob_constr                    *)
(**************************************************************************)

let extract_ids env =
  List.fold_right Id.Set.add
    (Termops.ids_of_rel_context (Environ.rel_context env))
    Id.Set.empty

let bound_univs sigma = Evd.universe_binders sigma

let scope_of_type_kind env sigma = function
  | IsType -> Notation.current_type_scope_names ()
  | OfType typ -> compute_type_scope env sigma typ
  | WithoutTypeConstraint -> []

let allowed_binder_kind_of_type_kind = function
  | IsType -> AbsPi
  | OfType _ | WithoutTypeConstraint -> AbsLambda

let empty_ltac_sign = {
  ltac_vars = Id.Set.empty;
  ltac_bound = Id.Set.empty;
  ltac_extra = Genintern.Store.empty;
}

let intern_gen kind env sigma
               ?(impls=empty_internalization_env) ?strict_check ?(pattern_mode=false) ?(ltacvars=empty_ltac_sign)
               c =
  let tmp_scope = Option.cata (scope_of_type_kind env sigma) [] kind in
  let k = Option.map allowed_binder_kind_of_type_kind kind in
  internalize env {ids = extract_ids env; strict_check; pattern_mode;
                   local_univs = { bound = bound_univs sigma; unb_univs = true };
                   tmp_scope = tmp_scope; scopes = [];
                   impls; binder_block_names = Some k; ntn_binding_ids = Id.Set.empty}
    (ltacvars, Id.Map.empty) c

let intern_unknown_if_term_or_type env sigma c =
  intern_gen None env sigma c

let intern_gen kind env sigma ?impls ?strict_check ?pattern_mode ?ltacvars c =
  intern_gen (Some kind) env sigma ?impls ?strict_check ?pattern_mode ?ltacvars c

let intern_constr env sigma c = intern_gen WithoutTypeConstraint env sigma c
let intern_type env sigma c = intern_gen IsType env sigma c
let intern_pattern globalenv patt =
  let env = {pat_ids = None; pat_scopes = ([], [])} in
  intern_cases_pattern test_kind_tolerant globalenv Id.Map.empty env empty_alias patt

(*********************************************************************)
(* Functions to parse and interpret constructions *)

(* All evars resolved *)

let interp_gen ?flags kind env sigma ?(impls=empty_internalization_env) c =
  let c = intern_gen kind ~impls env sigma c in
  understand ?flags ~expected_type:kind env sigma c

let interp_constr ?flags ?(expected_type=WithoutTypeConstraint) env sigma ?(impls=empty_internalization_env) c =
  interp_gen ?flags expected_type env sigma c

let interp_type ?flags env sigma ?(impls=empty_internalization_env) c =
  interp_gen ?flags IsType env sigma ~impls c

let interp_casted_constr ?flags env sigma ?(impls=empty_internalization_env) c typ =
  interp_gen ?flags (OfType typ) env sigma ~impls c

(* Not all evars expected to be resolved *)

let interp_open_constr ?(expected_type=WithoutTypeConstraint) env sigma c =
  understand_tcc env sigma (intern_gen expected_type env sigma c)

(* Not all evars expected to be resolved and computation of implicit args *)

let interp_constr_evars_gen_impls ?(flags=Pretyping.all_no_fail_flags) env sigma
    ?(impls=empty_internalization_env) expected_type c =
  let c = intern_gen expected_type ~impls env sigma c in
  let imps = Implicit_quantifiers.implicits_of_glob_constr ~with_products:(expected_type == IsType) c in
  let sigma, c = understand_tcc ~flags env sigma ~expected_type c in
  sigma, (c, imps)

let interp_constr_evars_impls ?(program_mode=false) ?(poly = PolyFlags.default) env sigma ?(impls=empty_internalization_env) c =
  let flags = { Pretyping.all_no_fail_flags with program_mode ; poly } in
  interp_constr_evars_gen_impls ~flags env sigma ~impls WithoutTypeConstraint c

let interp_casted_constr_evars_impls ?(program_mode=false) ?(poly = PolyFlags.default) env evdref ?(impls=empty_internalization_env) c typ =
  let flags = { Pretyping.all_no_fail_flags with program_mode ; poly } in
  interp_constr_evars_gen_impls ~flags env evdref ~impls (OfType typ) c

let interp_type_evars_impls ?(flags=Pretyping.all_no_fail_flags) env sigma ?(impls=empty_internalization_env) c =
  interp_constr_evars_gen_impls ~flags env sigma ~impls IsType c

(* Not all evars expected to be resolved, with side-effect on evars *)

let interp_constr_evars_gen ?flags ?(program_mode=false) env sigma ?(impls=empty_internalization_env) expected_type c =
  let c = intern_gen expected_type ~impls env sigma c in
  let flags = Option.default { Pretyping.all_no_fail_flags with program_mode } flags in
  understand_tcc ~flags env sigma ~expected_type c

let interp_constr_evars ?program_mode env evdref ?(impls=empty_internalization_env) c =
  interp_constr_evars_gen ?program_mode env evdref WithoutTypeConstraint ~impls c

let interp_casted_constr_evars ?flags ?program_mode env sigma ?(impls=empty_internalization_env) c typ =
  interp_constr_evars_gen ?flags ?program_mode env sigma ~impls (OfType typ) c

let interp_type_evars ?program_mode env sigma ?(impls=empty_internalization_env) c =
  interp_constr_evars_gen ?program_mode env sigma IsType ~impls c

(* Miscellaneous *)
let intern_constr_pattern env sigma ?(as_type=false) ?strict_check ?(ltacvars=empty_ltac_sign) c =
  let c = intern_gen (if as_type then IsType else WithoutTypeConstraint)
            ?strict_check ~pattern_mode:true ~ltacvars env sigma c in
  pattern_of_glob_constr env c

let interp_constr_pattern env sigma ?as_type ?strict_check c =
  let ids, pat = intern_constr_pattern env sigma ?as_type ?strict_check c in
  ids, Patternops.interp_pattern env sigma Glob_ops.empty_lvar pat

let intern_core kind env sigma ?strict_check ?(pattern_mode=false) ?(ltacvars=empty_ltac_sign)
      { Genintern.intern_ids = ids; Genintern.notation_variable_status = vl } c =
  let tmp_scope = scope_of_type_kind env sigma kind in
  let impls = empty_internalization_env in
  let k = allowed_binder_kind_of_type_kind kind in
  internalize env
    {ids; strict_check; pattern_mode;
     local_univs = { bound = bound_univs sigma; unb_univs = true };
     tmp_scope; scopes = []; impls;
     binder_block_names = Some (Some k); ntn_binding_ids = Id.Set.empty}
    (ltacvars, vl) c

let interp_notation_constr env ?(impls=empty_internalization_env) nenv a =
  let ids = extract_ids env in
  (* [vl] is intended to remember the scope of the free variables of [a] *)
  let make_status scopes typ = {
    Genintern.ntnvar_used = [];
    ntnvar_used_as_binder = false;
    ntnvar_scopes = scopes;
    ntnvar_binding_ids = None;
    ntnvar_typ = typ;
  }
  in
  let vl = Id.Map.map (function
    | (NtnInternTypeAny None | NtnInternTypeOnlyBinder) as typ -> make_status None typ
    | NtnInternTypeAny (Some scope) as typ -> make_status (Some ([scope],[])) typ)
    nenv.ninterp_var_type in
  let impls = Id.Map.fold (fun id _ impls -> Id.Map.remove id impls) nenv.ninterp_var_type impls in
  let c = internalize env
      {ids; strict_check = Some true; pattern_mode = false;
       local_univs = empty_local_univs;
       tmp_scope = []; scopes = []; impls; binder_block_names = None; ntn_binding_ids = Id.Set.empty}
      (empty_ltac_sign, vl) a
  in
  (* Splits variables into those that are binding, bound, or both *)
  (* Translate and check that [c] has all its free variables bound in [vars] *)
  let a, reversible = notation_constr_of_glob_constr nenv c in
  (* binding and bound *)
  let out_scope = function None -> [],[] | Some (a,l) -> a,l in
  let out_bindings = function None -> Id.Set.empty | Some a -> a in
  let unused = match reversible with NonInjective ids -> ids | _ -> [] in
  let vars = Id.Map.mapi (fun id status ->
      (status.Genintern.ntnvar_used_as_binder && not (List.mem_f Id.equal id unused),
       out_scope status.ntnvar_scopes, out_bindings status.ntnvar_binding_ids)) vl in
  (* Returns [a] and the ordered list of variables with their scopes *)
  vars, a, reversible

(* Interpret binders and contexts  *)

let interp_binder env sigma na t =
  let t = intern_gen IsType env sigma t in
  let t' = locate_if_hole ?loc:(loc_of_glob_constr t) na t in
  understand ~expected_type:IsType env sigma t'

let interp_binder_evars env sigma na t =
  let t = intern_gen IsType env sigma t in
  let t' = locate_if_hole ?loc:(loc_of_glob_constr t) na t in
  understand_tcc env sigma ~expected_type:IsType t'

let my_intern_constr env lvar acc c =
  internalize env acc lvar c

let default_internalization_env ids bound_univs impl_env =
  {ids; strict_check = Some true; pattern_mode = false;
   local_univs = { bound = bound_univs; unb_univs = true };
   tmp_scope = []; scopes = []; impls = impl_env;
   binder_block_names = Some (Some AbsPi);
   ntn_binding_ids = Id.Set.empty}

let intern_context env ~bound_univs impl_env binders =
  let lvar = (empty_ltac_sign, Id.Map.empty) in
  let ids =
    (* We assume all ids around are parts of the prefix of the current
       context being interpreted *)
     extract_ids env in
  let lenv, bl = List.fold_left
            (fun (lenv, bl) b ->
               let (env, bl) = intern_local_binder_aux ~dump:false (my_intern_constr env lvar) Id.Map.empty (lenv, bl) b in
               (env, bl))
            (default_internalization_env ids bound_univs impl_env, [])
            binders in
  (lenv.impls, List.map glob_local_binder_of_extended bl)

let impl_of_binder_kind na = function
  | NonMaxImplicit -> CAst.make (Some (na,false))
  | MaxImplicit -> CAst.make (Some (na,true))
  | Explicit -> CAst.make None

let push_auto_implicit env sigma t int_env id =
  let var_info = Id.Map.find id int_env.impls in
  let imps = List.map (fun imp -> CAst.make (Option.map (fun imp -> (pi1 imp.impl_pos,imp.impl_max)) imp)) var_info.var_impls in
  let imps = compute_internalization_data env sigma ~silent:false id var_info.var_intern_typ t imps in (* add automatic implicit arguments to manual ones *)
  { int_env with impls = Id.Map.add id imps int_env.impls }

let interp_context_evars_gen ?(program_mode=false) ?(unconstrained_sorts = false) ?(poly = PolyFlags.default) ?(impl_env=empty_internalization_env) ?(autoimp_enable=true) ~dump env sigma make_decl push_decl bl =
  let lvar = (empty_ltac_sign, Id.Map.empty) in
  let ids =
    (* We assume all ids around are parts of the prefix of the current
       context being interpreted *)
     extract_ids env in
  let int_env = default_internalization_env ids (bound_univs sigma) impl_env in
  let flags = { Pretyping.all_no_fail_flags with program_mode; unconstrained_sorts; poly } in
  let (int_env, (env, sigma, bl, impls, locs)) =
    List.fold_left
      (fun (int_env, acc) b ->
        let int_env, bl = intern_local_binder_aux ~dump (my_intern_constr env lvar) Id.Map.empty (int_env,[]) b in
        let int_env, acc = List.fold_right (fun b' (int_env, (env,sigma,params,impls,locs)) ->
          let loc = b'.CAst.loc in
          let (na, _, bk, b', t) = glob_local_binder_of_extended b' in
          let sigma, t =
              let t' = if Option.is_empty b' then locate_if_hole ?loc:(loc_of_glob_constr t) na t else t in (* useful? *)
              let sigma, t, _ = Pretyping.ise_pretype_gen flags env sigma empty_lvar IsType t' in
              sigma, t
          in
          let r = Retyping.relevance_of_type env sigma t in
          match b' with
          | None ->
            let int_env = if autoimp_enable then Name.fold_left (push_auto_implicit env sigma t) int_env na else int_env in
            let d = make_decl ?loc (LocalAssum (make_annot na r,t)) in
            let impls = impl_of_binder_kind na bk :: impls in
            (int_env, (push_decl d env, sigma, d::params, impls, loc::locs))
          | Some b ->
            assert (bk = Explicit);
            let sigma, c, _ = Pretyping.ise_pretype_gen flags env sigma empty_lvar (OfType t) b in
            let d = make_decl ?loc (LocalDef (make_annot na r, c, t)) in
            (int_env, (push_decl d env, sigma, d::params, impls, loc::locs)))
          bl (int_env,acc) in
        int_env, acc)
      (int_env,(env,sigma,[],[],[])) bl
  in
  sigma, (int_env.impls, ((env, bl), List.rev impls, locs))

let interp_named_context_evars ?program_mode ?unconstrained_sorts ?poly ?impl_env ?autoimp_enable env sigma bl =
  let extract_name ?loc = function Name id -> id | Anonymous -> user_err ?loc Pp.(str "Unexpected anonymous variable.") in
  let make_decl ?loc = Context.Named.Declaration.of_rel_decl (extract_name ?loc) in
  interp_context_evars_gen ?program_mode ?unconstrained_sorts ?poly ?impl_env ?autoimp_enable ~dump:false env sigma make_decl EConstr.push_named bl

let interp_context_evars ?program_mode ?unconstrained_sorts ?poly ?impl_env env sigma bl =
  interp_context_evars_gen ?program_mode ?unconstrained_sorts ?poly ?impl_env ~autoimp_enable:false ~dump:true env sigma (fun ?loc d -> d) EConstr.push_rel bl

(** Local universe and constraint declarations. *)

let known_universe_level_name evd lid =
  try Evd.universe_of_name evd lid.CAst.v
  with Not_found ->
    let u = Nametab.locate_universe (Libnames.qualid_of_lident lid) in
    Univ.Level.make u

let known_glob_level evd = function
  | GSProp | GProp ->
    CErrors.user_err (Pp.str "Universe constraints cannot mention Prop or SProp.")
  | GSet -> Univ.Level.set
  | GUniv u -> u
  | GRawUniv u -> anomaly Pp.(str "Raw universe in known_glob_level.")
  | GLocalUniv lid ->
    try known_universe_level_name evd lid
    with Not_found ->
      user_err ?loc:lid.CAst.loc
        (str "Undeclared universe " ++ Id.print lid.CAst.v)

let interp_known_level evd u =
  let u = intern_sort_name ~local_univs:{bound = bound_univs evd; unb_univs=false} u in
  known_glob_level evd u

let interp_univ_constraint evd (u,c,v) =
  let u = interp_known_level evd u in
  let v = interp_known_level evd v in
  u,c,v

let interp_univ_constraints env evd cstrs =
  let interp (evd,cstrs) cstr =
    let cstr = interp_univ_constraint evd cstr in
    try
      let evd = Evd.add_univ_constraints evd (Univ.UnivConstraints.singleton cstr) in
      evd, Univ.UnivConstraints.add cstr cstrs
    with UGraph.UniverseInconsistency e as exn ->
      let _, info = Exninfo.capture exn in
      CErrors.user_err ~info
        (UGraph.explain_universe_inconsistency (Termops.pr_evd_qvar evd) (Termops.pr_evd_level evd) e)
  in
  List.fold_left interp (evd,Univ.UnivConstraints.empty) cstrs

let known_glob_quality evd q =
  match q with
  | GQConstant q -> Sorts.Quality.QConstant q
  | GQualVar (GLocalQVar _) -> assert false
  | GQualVar (GQVar q | GRawQVar q) -> Sorts.Quality.QVar q

let interp_known_quality evd q =
  let q = intern_quality ~local_univs:{bound = bound_univs evd; unb_univs=false} q in
  known_glob_quality evd q

let interp_elim_constraint evd (q1,k,q2) =
  let q1 = interp_known_quality evd q1 in
  let q2 = interp_known_quality evd q2 in
  q1,k,q2

let interp_elim_constraints env evd cstrs =
  let interp (evd,cstrs) cstr =
    let cstr = interp_elim_constraint evd cstr in
    try let evd = Evd.add_poly_constraints ~src:UState.Rigid evd @@
                    PConstraints.of_qualities (Sorts.ElimConstraints.singleton cstr) in
        evd, Sorts.ElimConstraints.add cstr cstrs
    with QGraph.EliminationError e as exn ->
      let _, info = Exninfo.capture exn in
      CErrors.user_err ~info @@
        QGraph.explain_elimination_error (Termops.pr_evd_qvar evd) e
  in
  List.fold_left interp (evd, Sorts.ElimConstraints.empty) cstrs

let interp_univ_decl env decl =
  let open UState in
  let evd = Evd.from_env env in
  let evd, qualities = List.fold_left_map (fun evd lid ->
      Evd.new_quality_variable ?loc:lid.loc ~name:lid.v evd)
      evd
      decl.univdecl_qualities
  in
  let evd, instance = List.fold_left_map (fun evd lid ->
      Evd.new_univ_level_variable ?loc:lid.loc univ_rigid ~name:lid.v evd)
      evd
      decl.univdecl_instance
  in
  let evd, univ_cstrs = interp_univ_constraints env evd decl.univdecl_univ_constraints in
  let evd, elim_cstrs = interp_elim_constraints env evd decl.univdecl_elim_constraints in
  let decl = {
    univdecl_qualities = qualities;
    univdecl_extensible_qualities = decl.univdecl_extensible_qualities;
    univdecl_elim_constraints = elim_cstrs;
    univdecl_instance = instance;
    univdecl_extensible_instance = decl.univdecl_extensible_instance;
    univdecl_univ_constraints = univ_cstrs;
    univdecl_extensible_constraints = decl.univdecl_extensible_constraints;
  }
  in evd, decl

let interp_cumul_univ_decl env decl =
  let open UState in
  let binders = List.map fst decl.univdecl_instance in
  let variances = Array.map_of_list snd decl.univdecl_instance in
  let evd = Evd.from_env env in
  let evd, qualities = List.fold_left_map (fun evd lid ->
      Evd.new_quality_variable ?loc:lid.loc ~name:lid.v evd)
      evd
      decl.univdecl_qualities
  in
  let evd, instance = List.fold_left_map (fun evd lid ->
      Evd.new_univ_level_variable ?loc:lid.loc univ_rigid ~name:lid.v evd)
      evd
      binders
  in
  let evd, univ_cstrs = interp_univ_constraints env evd decl.univdecl_univ_constraints in
  let evd, elim_cstrs = interp_elim_constraints env evd decl.univdecl_elim_constraints in
  let decl = {
    univdecl_qualities = qualities;
    univdecl_extensible_qualities = decl.univdecl_extensible_qualities;
    univdecl_elim_constraints = elim_cstrs;
    univdecl_instance = instance;
    univdecl_extensible_instance = decl.univdecl_extensible_instance;
    univdecl_univ_constraints = univ_cstrs;
    univdecl_extensible_constraints = decl.univdecl_extensible_constraints;
  }
  in
  evd, decl, variances

let interp_univ_decl_opt env l =
  match l with
  | None -> Evd.from_env env, UState.default_univ_decl
  | Some decl -> interp_univ_decl env decl

let interp_cumul_univ_decl_opt env = function
  | None -> Evd.from_env env, UState.default_univ_decl, [| |]
  | Some decl -> interp_cumul_univ_decl env decl

let interp_mutual_univ_decl_opt env udecls =
  let udecl =
    List.fold_right (fun udecl acc ->
      match udecl , acc with
      | None , acc -> acc
      | x , None -> x
      | Some ls , Some us ->
        let open UState in
        let lsu = ls.univdecl_instance and usu = us.univdecl_instance in
        if not (CList.for_all2eq (fun x y -> Id.equal x.CAst.v y.CAst.v) lsu usu) then
          CErrors.user_err Pp.(str "Mutual definitions should all have the same universe binders.");
        Some us) udecls None
  in
  interp_univ_decl_opt env udecl
