let xxx_type_of_aux' m c t =
try
- Some (fst (CicTypeChecker.type_of_aux' m c t CicUniv.empty_ugraph))
+ Some (fst (CicTypeChecker.type_of_aux' m c t CicUniv.oblivion_ugraph))
with
| CicTypeChecker.TypeCheckerFailure _ -> None (* because eta_expansion *)
;;
function
C.Rel m when m = n -> false
| C.Rel _
+(* FG/CSC: maybe we assume the meta is guarded so we do not recur on its *)
+(* explicit subsitutions (copied from the kernel) ??? *)
| C.Meta _
| C.Sort _
| C.Implicit _ -> true
| C.Lambda (name,so,dest) ->
does_not_occur n so &&
does_not_occur (n + 1) dest
- | C.LetIn (name,so,dest) ->
+ | C.LetIn (name,so,ty,dest) ->
does_not_occur n so &&
- does_not_occur (n + 1) dest
+ does_not_occur n ty &&
+ does_not_occur (n + 1) dest
| C.Appl l ->
List.fold_right (fun x i -> i && does_not_occur n x) l true
| C.Var (_,exp_named_subst)
) fl true
;;
-let rec beta_reduce =
+(* FG: if ~clean:true, unreferenced letins are removed *)
+(* (beta-reducttion can cause unreferenced letins) *)
+let rec beta_reduce ?(clean=false)=
let module S = CicSubstitution in
let module C = Cic in
function
C.Rel _ as t -> t
| C.Var (uri,exp_named_subst) ->
let exp_named_subst' =
- List.map (function (i,t) -> i, beta_reduce t) exp_named_subst
+ List.map (function (i,t) -> i, beta_reduce ~clean t) exp_named_subst
in
C.Var (uri,exp_named_subst')
| C.Meta (n,l) ->
C.Meta (n,
List.map
- (function None -> None | Some t -> Some (beta_reduce t)) l
+ (function None -> None | Some t -> Some (beta_reduce ~clean t)) l
)
| C.Sort _ as t -> t
| C.Implicit _ -> assert false
| C.Cast (te,ty) ->
- C.Cast (beta_reduce te, beta_reduce ty)
+ C.Cast (beta_reduce ~clean te, beta_reduce ~clean ty)
| C.Prod (n,s,t) ->
- C.Prod (n, beta_reduce s, beta_reduce t)
+ C.Prod (n, beta_reduce ~clean s, beta_reduce ~clean t)
| C.Lambda (n,s,t) ->
- C.Lambda (n, beta_reduce s, beta_reduce t)
- | C.LetIn (n,s,t) ->
- C.LetIn (n, beta_reduce s, beta_reduce t)
+ C.Lambda (n, beta_reduce ~clean s, beta_reduce ~clean t)
+ | C.LetIn (n,s,ty,t) ->
+ let t' = beta_reduce ~clean t in
+ if clean && does_not_occur 1 t' then
+ (* since [Rel 1] does not occur in typ, substituting any term *)
+ (* in place of [Rel 1] is equivalent to delifting once *)
+ CicSubstitution.subst (C.Implicit None) t'
+ else
+ C.LetIn (n, beta_reduce ~clean s, beta_reduce ~clean ty, t')
| C.Appl ((C.Lambda (name,s,t))::he::tl) ->
let he' = S.subst he t in
if tl = [] then
- beta_reduce he'
+ beta_reduce ~clean he'
else
(match he' with
- C.Appl l -> beta_reduce (C.Appl (l@tl))
- | _ -> beta_reduce (C.Appl (he'::tl)))
+ C.Appl l -> beta_reduce ~clean (C.Appl (l@tl))
+ | _ -> beta_reduce ~clean (C.Appl (he'::tl)))
| C.Appl l ->
- C.Appl (List.map beta_reduce l)
+ C.Appl (List.map (beta_reduce ~clean) l)
| C.Const (uri,exp_named_subst) ->
let exp_named_subst' =
- List.map (function (i,t) -> i, beta_reduce t) exp_named_subst
+ List.map (function (i,t) -> i, beta_reduce ~clean t) exp_named_subst
in
C.Const (uri,exp_named_subst')
| C.MutInd (uri,i,exp_named_subst) ->
let exp_named_subst' =
- List.map (function (i,t) -> i, beta_reduce t) exp_named_subst
+ List.map (function (i,t) -> i, beta_reduce ~clean t) exp_named_subst
in
C.MutInd (uri,i,exp_named_subst')
| C.MutConstruct (uri,i,j,exp_named_subst) ->
let exp_named_subst' =
- List.map (function (i,t) -> i, beta_reduce t) exp_named_subst
+ List.map (function (i,t) -> i, beta_reduce ~clean t) exp_named_subst
in
C.MutConstruct (uri,i,j,exp_named_subst')
| C.MutCase (sp,i,outt,t,pl) ->
- C.MutCase (sp,i,beta_reduce outt,beta_reduce t,
- List.map beta_reduce pl)
+ C.MutCase (sp,i,beta_reduce ~clean outt,beta_reduce ~clean t,
+ List.map (beta_reduce ~clean) pl)
| C.Fix (i,fl) ->
let fl' =
List.map
(function (name,i,ty,bo) ->
- name,i,beta_reduce ty,beta_reduce bo
+ name,i,beta_reduce ~clean ty,beta_reduce ~clean bo
) fl
in
C.Fix (i,fl')
let fl' =
List.map
(function (name,ty,bo) ->
- name,beta_reduce ty,beta_reduce bo
+ name,beta_reduce ~clean ty,beta_reduce ~clean bo
) fl
in
C.CoFix (i,fl')
let module R = CicReduction in
let module U = UriManager in
let cobj =
- match CicEnvironment.is_type_checked CicUniv.empty_ugraph uri with
+ match CicEnvironment.is_type_checked CicUniv.oblivion_ugraph uri with
CicEnvironment.CheckedObj (cobj,_) -> cobj
- | CicEnvironment.UncheckedObj uobj ->
+ | CicEnvironment.UncheckedObj (uobj,_) ->
raise (NotWellTyped "Reference to an unchecked constant")
in
match cobj with
let module C = Cic in
let module R = CicReduction in
let module U = UriManager in
- match CicEnvironment.is_type_checked CicUniv.empty_ugraph uri with
+ match CicEnvironment.is_type_checked CicUniv.oblivion_ugraph uri with
CicEnvironment.CheckedObj ((C.Variable (_,_,ty,_,_)),_) -> ty
- | CicEnvironment.UncheckedObj (C.Variable _) ->
+ | CicEnvironment.UncheckedObj (C.Variable _,_) ->
raise (NotWellTyped "Reference to an unchecked variable")
| _ -> raise (WrongUriToVariable (UriManager.string_of_uri uri))
;;
let module R = CicReduction in
let module U = UriManager in
let cobj =
- match CicEnvironment.is_type_checked CicUniv.empty_ugraph uri with
+ match CicEnvironment.is_type_checked CicUniv.oblivion_ugraph uri with
CicEnvironment.CheckedObj (cobj,_) -> cobj
- | CicEnvironment.UncheckedObj uobj ->
+ | CicEnvironment.UncheckedObj (uobj,_) ->
raise (NotWellTyped "Reference to an unchecked inductive type")
in
match cobj with
let module R = CicReduction in
let module U = UriManager in
let cobj =
- match CicEnvironment.is_type_checked CicUniv.empty_ugraph uri with
+ match CicEnvironment.is_type_checked CicUniv.oblivion_ugraph uri with
CicEnvironment.CheckedObj (cobj,_) -> cobj
- | CicEnvironment.UncheckedObj uobj ->
+ | CicEnvironment.UncheckedObj (uobj,_) ->
raise (NotWellTyped "Reference to an unchecked constructor")
in
match cobj with
(try
match List.nth context (n - 1) with
Some (_,C.Decl t) -> S.lift n t
- | Some (_,C.Def (_,Some ty)) -> S.lift n ty
- | Some (_,C.Def (bo,None)) ->
- type_of_aux context (S.lift n bo) expectedty
- | None -> raise RelToHiddenHypothesis
+ | Some (_,C.Def (_,ty)) -> S.lift n ty
+ | None -> raise RelToHiddenHypothesis
with
_ -> raise (NotWellTyped "Not a close term")
)
[] -> []
| (Some (n,C.Decl t))::tl ->
(Some (n,C.Decl (S.subst_meta l (S.lift i t))))::(aux (i+1) tl)
- | (Some (n,C.Def (t,None)))::tl ->
- (Some (n,C.Def ((S.subst_meta l (S.lift i t)),None)))::
- (aux (i+1) tl)
+ | (Some (n,C.Def (t,ty)))::tl ->
+ (Some (n,
+ C.Def
+ ((S.subst_meta l (S.lift i t)),S.subst_meta l (S.lift i t))))::
+ (aux (i+1) tl)
| None::tl -> None::(aux (i+1) tl)
- | (Some (_,C.Def (_,Some _)))::_ -> assert false
in
aux 1 canonical_context
in
| C.Lambda (n,s,t) ->
(* Let's visit all the subterms that will not be visited later *)
let _ = type_of_aux context s None in
- let expected_target_type =
+ let n, expected_target_type =
match expectedty with
- None -> None
+ | None -> n, None
| Some expectedty' ->
- let ty =
+ let n, ty =
match R.whd context expectedty' with
- C.Prod (_,_,expected_target_type) ->
- beta_reduce expected_target_type
+ | C.Prod (n',_,expected_target_type) ->
+ let xtt = beta_reduce expected_target_type in
+ if n <> C.Anonymous then n, xtt else n', xtt
| _ -> assert false
in
- Some ty
+ n, Some ty
in
let type2 =
type_of_aux ((Some (n,(C.Decl s)))::context) t expected_target_type
in
(* Checks suppressed *)
C.Prod (n,s,type2)
- | C.LetIn (n,s,t) ->
+ | C.LetIn (n,s,ty,t) ->
(*CSC: What are the right expected types for the source and *)
(*CSC: target of a LetIn? None used. *)
(* Let's visit all the subterms that will not be visited later *)
- let ty = type_of_aux context s None in
+ let _ = type_of_aux context ty None in
+ let _ = type_of_aux context s (Some ty) in
let t_typ =
(* Checks suppressed *)
- type_of_aux ((Some (n,(C.Def (s,Some ty))))::context) t None
+ type_of_aux ((Some (n,(C.Def (s,ty))))::context) t None
in (* CicSubstitution.subst s t_typ *)
- if does_not_occur 1 t_typ then
- (* since [Rel 1] does not occur in typ, substituting any term *)
+ if does_not_occur 1 t_typ then
+ (* since [Rel 1] does not occur in typ, substituting any term *)
(* in place of [Rel 1] is equivalent to delifting once *)
CicSubstitution.subst (C.Implicit None) t_typ
else
- C.LetIn (n,s,t_typ)
+ C.LetIn (n,s,ty,t_typ)
| C.Appl (he::tl) when List.length tl > 0 ->
(*
let expected_hetype =
let (cl,parsno) =
let obj,_ =
try
- CicEnvironment.get_cooked_obj CicUniv.empty_ugraph uri
+ CicEnvironment.get_cooked_obj CicUniv.oblivion_ugraph uri
with Not_found -> assert false
in
match obj with
let (_,ty,_) = List.nth fl i in
ty
in
- let synthesized' = beta_reduce synthesized in
+(* FG: beta-reduction can cause unreferenced letins *)
+ let synthesized' = beta_reduce ~clean:true synthesized in
let synthesized' = !pack_coercion metasenv context synthesized' in
let types,res =
match expectedty with
let uris_and_types =
let obj,_ =
try
- CicEnvironment.get_cooked_obj CicUniv.empty_ugraph uri
+ CicEnvironment.get_cooked_obj CicUniv.oblivion_ugraph uri
with Not_found -> assert false
in
let params = CicUtil.params_of_obj obj in
(function uri ->
let obj,_ =
try
- CicEnvironment.get_cooked_obj CicUniv.empty_ugraph uri
+ CicEnvironment.get_cooked_obj CicUniv.oblivion_ugraph uri
with Not_found -> assert false
in
match obj with
in
let rec check uris_and_types subst =
match uris_and_types,subst with
- _,[] -> []
+ _,[] -> ()
| (uri,ty)::tytl,(uri',t)::substtl when uri = uri' ->
ignore (type_of_aux context t (Some ty)) ;
let tytl' =
let t1' = CicReduction.whd context t1 in
let t2' = CicReduction.whd ((Some (name,C.Decl s))::context) t2 in
match (t1', t2') with
- (C.Sort _, C.Sort s2)
- when (s2 = C.Prop or s2 = C.Set or s2 = C.CProp) ->
- (* different from Coq manual!!! *)
- C.Sort s2
- | (C.Sort (C.Type t1), C.Sort (C.Type t2)) ->
- C.Sort (C.Type (CicUniv.fresh()))
- | (C.Sort _,C.Sort (C.Type t1)) ->
- (* TASSI: CONSRTAINTS: the same in cictypechecker,cicrefine *)
- C.Sort (C.Type t1) (* c'e' bisogno di un fresh? *)
+ | (C.Sort _, C.Sort s2) when (s2 = C.Prop || s2 = C.Set) -> C.Sort s2
+ | (C.Sort (C.Type t1), C.Sort (C.Type t2)) ->C.Sort(C.Type(CicUniv.fresh()))
+ | (C.Sort _,C.Sort (C.Type t1)) -> C.Sort (C.Type t1)
+ | (C.Sort _,C.Sort (C.CProp t1)) -> C.Sort (C.CProp t1)
| (C.Meta _, C.Sort _) -> t2'
| (C.Meta _, (C.Meta (_,_) as t))
| (C.Sort _, (C.Meta (_,_) as t)) when CicUtil.is_closed t ->
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