if is_type attrs then
metasenv,subst,true
else
+ let _,cc,ty = NCicUtils.lookup_meta n metasenv in
+ let metasenv,subst,ty = sortfy exc metasenv subst cc ty in
let metasenv =
NCicUntrusted.replace_in_metasenv n
- (fun attrs,cc,ty -> NCicUntrusted.set_kind `IsType attrs, cc, ty)
+ (fun attrs,cc,_ -> NCicUntrusted.set_kind `IsType attrs, cc, ty)
metasenv
in
metasenv,subst,false
if is_type attrs then
metasenv,subst,true
else
+ let _,cc,_,ty = NCicUtils.lookup_subst n subst in
+ let metasenv,subst,ty = sortfy exc metasenv subst cc ty in
let subst =
NCicUntrusted.replace_in_subst n
- (fun attrs,cc,bo,ty->NCicUntrusted.set_kind `IsType attrs,cc,bo,ty)
+ (fun attrs,cc,bo,_->NCicUntrusted.set_kind `IsType attrs,cc,bo,ty)
subst
in
optimize_meta metasenv subst (NCicSubstitution.subst_meta lc bo))
~unify:(fun m s c t1 t2 ->
let ind = !indent in
let res =
- try Some (unify rdb test_eq_only m s c t1 t2 )
+ try Some (unify rdb test_eq_only m s c t1 t2 false)
with UnificationFailure _ | Uncertain _ -> None
in
indent := ind; res)
let oldt = NCicSubstitution.subst_meta lc oldt in
let t = NCicSubstitution.subst_meta lc t in
(* conjecture: always fail --> occur check *)
- unify rdb test_eq_only metasenv subst context t oldt
+ unify rdb test_eq_only metasenv subst context t oldt false
with NCicUtils.Subst_not_found _ ->
move_to_subst n (attrs,cc,t,ty) metasenv subst
in
ppterm ~metasenv ~subst ~context ty ^ "=<=" ^
ppterm ~metasenv ~subst ~context ty_t));
let metasenv, subst =
- unify rdb false metasenv subst context ty_t ty in
+ unify rdb false metasenv subst context ty_t ty false in
delift_to_subst test_eq_only n lc (attrs,cc,ty) t
context metasenv subst
| _ -> assert false)
| `IsType
| `IsTerm ->
- (match ty,t with
- NCic.Implicit (`Typeof _), _ ->
+ (match ty with
+ NCic.Implicit (`Typeof _) ->
let (metasenv, subst), ty_t =
try
NCicMetaSubst.delift
~unify:(fun m s c t1 t2 ->
let ind = !indent in
- let res = try Some (unify rdb test_eq_only m s c t1 t2 )
+ let res = try Some (unify rdb test_eq_only m s c t1 t2 false )
with UnificationFailure _ | Uncertain _ -> None
in
indent := ind; res)
in
delift_to_subst test_eq_only n lc (attrs,cc,ty_t) t context metasenv
subst
- | _, _ ->
+ | _ ->
let lty = NCicSubstitution.subst_meta lc ty in
pp (lazy ("On the types: " ^
ppterm ~metasenv ~subst ~context lty ^ "=<=" ^
ppterm ~metasenv ~subst ~context ty_t));
let metasenv, subst =
- unify rdb false metasenv subst context ty_t lty
+ unify rdb false metasenv subst context ty_t lty false
in
delift_to_subst test_eq_only n lc (attrs,cc,ty) t context metasenv
subst)
-(*
- | kind, ty, NCic.Meta(m,lcm), _ when List.mem_assoc m subst ->
- let at,ccm,bo,tym = NCicUtils.lookup_subst m subst in
- if NCicMetaSubst.is_out_scope_tag at then
- begin
- (* Case meta vs out-scope *)
- pp(lazy("4.1"));
- let ty_t, ccm, kindm =
- NCicSubstitution.subst_meta lcm tym, ccm,
- NCicUntrusted.kind_of_meta at in
- let lty = NCicSubstitution.subst_meta lc ty in
- pp (lazy ("On the types: " ^
- ppterm ~metasenv ~subst ~context lty ^ "=<=" ^
- ppterm ~metasenv ~subst ~context ty_t));
- let metasenv, subst =
- unify rdb false metasenv subst context ty_t lty in
- (*CSC: here I should call kindfy, but it fails since the second
- meta in in the susbt, not the metasenv! *)
- (* let metasenv,subst,t = kindfy exc metasenv subst ccm m lcm ty_t kindm kind in *)
- delift_to_subst test_eq_only n lc attrs cc t ty context metasenv subst
- end
- else
- let bo = NCicSubstitution.subst_meta lcm bo in
- instantiate rdb test_eq_only metasenv subst context n lc bo swap
-*)
(*D*) in outside None; rc with exn -> outside (Some exn); raise exn
-and unify rdb test_eq_only metasenv subst context t1 t2 =
+and unify rdb test_eq_only metasenv subst context t1 t2 swap =
(*D*) inside 'U'; try let rc =
let fo_unif test_eq_only metasenv subst (norm1,t1) (norm2,t2) =
(*D*) inside 'F'; try let rc =
- pp (lazy(" " ^ ppterm ~metasenv ~subst ~context t1 ^ " ==?== " ^
+ pp (lazy(" " ^ ppterm ~metasenv ~subst ~context t1 ^
+ (if swap then " ==>?== "
+ else " ==<?==" ) ^
ppterm ~metasenv ~subst ~context t2 ^ ppmetasenv
~subst metasenv));
- pp (lazy(" " ^ ppterm ~metasenv ~subst:[] ~context t1 ^ " ==??== " ^
+ pp (lazy(" " ^ ppterm ~metasenv ~subst:[] ~context t1 ^
+ (if swap then " ==>??== "
+ else " ==<??==" ) ^
ppterm ~metasenv ~subst:[] ~context t2 ^ ppmetasenv
~subst metasenv));
if t1 === t2 then
| C.Appl (C.Appl _::_), _ | _, C.Appl (C.Appl _::_) ->
prerr_endline "Appl [Appl _;_] or Appl [] or Appl [_] invariant";
assert false
- | (C.Sort (C.Type a), C.Sort (C.Type b)) when not test_eq_only ->
+ | (C.Sort (C.Type a), C.Sort (C.Type b)) when not test_eq_only ->
+ let a, b = if swap then b,a else a,b in
if NCicEnvironment.universe_leq a b then metasenv, subst
else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
| (C.Sort (C.Type a), C.Sort (C.Type b)) ->
if NCicEnvironment.universe_eq a b then metasenv, subst
else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
- | (C.Sort C.Prop,C.Sort (C.Type _)) ->
+ | (C.Sort C.Prop,C.Sort (C.Type _)) when not swap ->
+ if (not test_eq_only) then metasenv, subst
+ else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
+ | (C.Sort (C.Type _), C.Sort C.Prop) when swap ->
if (not test_eq_only) then metasenv, subst
else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
| (C.Lambda (name1,s1,t1), C.Lambda(_,s2,t2))
| (C.Prod (name1,s1,t1), C.Prod(_,s2,t2)) ->
- let metasenv, subst = unify rdb true metasenv subst context s1 s2 in
- unify rdb test_eq_only metasenv subst ((name1, C.Decl s1)::context) t1 t2
+ let metasenv, subst = unify rdb true metasenv subst context s1 s2 swap in
+ unify rdb test_eq_only metasenv subst ((name1, C.Decl s1)::context) t1 t2 swap
| (C.LetIn (name1,ty1,s1,t1), C.LetIn(_,ty2,s2,t2)) ->
- let metasenv,subst=unify rdb test_eq_only metasenv subst context ty1 ty2 in
- let metasenv,subst=unify rdb test_eq_only metasenv subst context s1 s2 in
+ let metasenv,subst=unify rdb test_eq_only metasenv subst context ty1 ty2 swap in
+ let metasenv,subst=unify rdb test_eq_only metasenv subst context s1 s2 swap in
let context = (name1, C.Def (s1,ty1))::context in
- unify rdb test_eq_only metasenv subst context t1 t2
+ unify rdb test_eq_only metasenv subst context t1 t2 swap
| (C.Meta (n1,(s1,l1 as lc1)),C.Meta (n2,(s2,l2 as lc2))) when n1 = n2 ->
(try
(fun t1 t2 (metasenv, subst, to_restrict, i) ->
try
let metasenv, subst =
- unify rdb test_eq_only metasenv subst context
+ unify rdb (*test_eq_only*) true metasenv subst context
(NCicSubstitution.lift s1 t1) (NCicSubstitution.lift s2 t2)
+ swap
in
metasenv, subst, to_restrict, i-1
with UnificationFailure _ | Uncertain _ ->
l1 l2 (metasenv, subst, [], List.length l1)
in
if to_restrict <> [] then
- let metasenv, subst, _ =
+ let metasenv, subst, _, _ =
NCicMetaSubst.restrict metasenv subst n1 to_restrict
in
metasenv, subst
let _,_,term,_ = NCicUtils.lookup_subst n1 subst in
let term1 = NCicSubstitution.subst_meta lc1 term in
let term2 = NCicSubstitution.subst_meta lc2 term in
- unify rdb test_eq_only metasenv subst context term1 term2
+ unify rdb test_eq_only metasenv subst context term1 term2 swap
with NCicUtils.Subst_not_found _-> raise (UnificationFailure msg))
| NCic.Appl (NCic.Meta (i,_)::_ as l1),
(try
List.fold_left2
(fun (metasenv, subst) t1 t2 ->
- unify rdb test_eq_only metasenv subst context t1 t2)
+ unify rdb (*test_eq_only*) true metasenv subst context t1
+ t2 swap)
(metasenv,subst) l1 l2
with Invalid_argument _ ->
raise (UnificationFailure (mk_msg metasenv subst context t1 t2)))
- | _, NCic.Meta (n, _) when is_locked n subst ->
+ | _, NCic.Meta (n, _) when is_locked n subst && not swap->
(let (metasenv, subst), i =
match NCicReduction.whd ~subst context t1 with
| NCic.Appl (NCic.Meta (i,l) as meta :: args) ->
(NCicTypeChecker.typeof ~metasenv ~subst context meta)
in
unify rdb test_eq_only metasenv subst context
- (C.Meta (i,l)) lambda_Mj,
+ (C.Meta (i,l)) lambda_Mj false,
i
| NCic.Meta (i,_) -> (metasenv, subst), i
| _ ->
let subst = List.filter (fun (j,_) -> j <> i) subst in
metasenv, ((i, (name, ctx, term, ty)) :: subst)
with Not_found -> assert false))
-
- | C.Meta (n,lc), t when List.mem_assoc n subst ->
- let _,_,term,_ = NCicUtils.lookup_subst n subst in
- let term = NCicSubstitution.subst_meta lc term in
- unify rdb test_eq_only metasenv subst context term t
+ | NCic.Meta (n, _), _ when is_locked n subst && swap ->
+ unify rdb test_eq_only metasenv subst context t2 t1 false
| t, C.Meta (n,lc) when List.mem_assoc n subst ->
let _,_,term,_ = NCicUtils.lookup_subst n subst in
let term = NCicSubstitution.subst_meta lc term in
- unify rdb test_eq_only metasenv subst context t term
-
- | NCic.Appl (NCic.Meta (i,l)::args), _ when List.mem_assoc i subst ->
- let _,_,term,_ = NCicUtils.lookup_subst i subst in
- let term = NCicSubstitution.subst_meta l term in
- unify rdb test_eq_only metasenv subst context
- (mk_appl ~upto:(List.length args) term args) t2
+ unify rdb test_eq_only metasenv subst context t term swap
+ | C.Meta (n,_), _ when List.mem_assoc n subst ->
+ unify rdb test_eq_only metasenv subst context t2 t1 (not swap)
| _, NCic.Appl (NCic.Meta (i,l)::args) when List.mem_assoc i subst ->
let _,_,term,_ = NCicUtils.lookup_subst i subst in
let term = NCicSubstitution.subst_meta l term in
unify rdb test_eq_only metasenv subst context t1
- (mk_appl ~upto:(List.length args) term args)
-
+ (mk_appl ~upto:(List.length args) term args) swap
+ | NCic.Appl (NCic.Meta (i,_)::_), _ when List.mem_assoc i subst ->
+ unify rdb test_eq_only metasenv subst context t2 t1 (not swap)
+
+ | C.Meta (n,_), C.Meta (m,lc') when
+ let _,cc1,_ = NCicUtils.lookup_meta n metasenv in
+ let _,cc2,_ = NCicUtils.lookup_meta m metasenv in
+ (n < m && cc1 = cc2) ||
+ let len1 = List.length cc1 in
+ let len2 = List.length cc2 in
+ len2 < len1 && cc2 = fst (HExtlib.split_nth len2 cc1) ->
+ instantiate rdb test_eq_only metasenv subst context m lc'
+ (NCicReduction.head_beta_reduce ~subst t1) (not swap)
| C.Meta (n,lc), t ->
instantiate rdb test_eq_only metasenv subst context n lc
- (NCicReduction.head_beta_reduce ~subst t) false
-
+ (NCicReduction.head_beta_reduce ~subst t) swap
| t, C.Meta (n,lc) ->
instantiate rdb test_eq_only metasenv subst context n lc
- (NCicReduction.head_beta_reduce ~subst t) true
+ (NCicReduction.head_beta_reduce ~subst t) (not swap)
| NCic.Appl (NCic.Meta (i,l) as meta :: args), _ ->
let metasenv, lambda_Mj =
let metasenv, subst =
try
unify rdb test_eq_only metasenv subst context
- (C.Meta (i,l)) lambda_Mj
+ (C.Meta (i,l)) lambda_Mj swap
with UnificationFailure msg | Uncertain msg when not norm2->
(* failure: let's try again argument vs argument *)
raise (KeepReducing msg)
in
let metasenv, subst =
- unify rdb test_eq_only metasenv subst context t1 t2
+ unify rdb test_eq_only metasenv subst context t1 t2 swap
in
(try
let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
let subst = List.filter (fun (j,_) -> j <> i) subst in
metasenv, ((i, (name, ctx, term, ty)) :: subst)
with Not_found -> assert false)
-
- | _, NCic.Appl (NCic.Meta (i,l) as meta :: args) ->
- let metasenv, lambda_Mj =
- lambda_intros rdb metasenv subst context (List.length args)
- (NCicTypeChecker.typeof ~metasenv ~subst context meta)
- in
- let metasenv, subst =
- try
- unify rdb test_eq_only metasenv subst context
- lambda_Mj (C.Meta (i,l))
- with UnificationFailure msg | Uncertain msg when not norm1 ->
- (* failure: let's try again argument vs argument *)
- raise (KeepReducing msg)
- in
- let metasenv, subst =
- unify rdb test_eq_only metasenv subst context t1 t2
- in
- (try
- let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
- let term = eta_reduce subst term in
- let subst = List.filter (fun (j,_) -> j <> i) subst in
- metasenv, ((i, (name, ctx, term, ty)) :: subst)
- with Not_found -> assert false)
+ | _, NCic.Appl (NCic.Meta (_,_) :: _) ->
+ unify rdb test_eq_only metasenv subst context t2 t1 (not swap)
(* processing this case here we avoid a useless small delta step *)
| (C.Appl ((C.Const r1) as _hd1::tl1), C.Appl (C.Const r2::tl2))
match relevance with b::tl -> b,tl | _ -> true, [] in
let metasenv, subst =
try unify rdb test_eq_only metasenv subst context t1 t2
+ swap
with UnificationFailure _ | Uncertain _ when not b ->
metasenv, subst
in
raise (Uncertain (mk_msg metasenv subst context t1 t2))
else
let metasenv, subst =
- unify rdb test_eq_only metasenv subst context outtype1 outtype2 in
+ unify rdb test_eq_only metasenv subst context outtype1 outtype2 swap in
let metasenv, subst =
- try unify rdb test_eq_only metasenv subst context term1 term2
+ try unify rdb test_eq_only metasenv subst context term1 term2 swap
with UnificationFailure _ | Uncertain _ when is_prop ->
metasenv, subst
in
(try
List.fold_left2
- (fun (metasenv,subst) ->
- unify rdb test_eq_only metasenv subst context)
+ (fun (metasenv,subst) t1 t2 ->
+ unify rdb test_eq_only metasenv subst context t1 t2 swap)
(metasenv, subst) pl1 pl2
with Invalid_argument _ -> assert false)
| (C.Implicit _, _) | (_, C.Implicit _) -> assert false
let metasenv,subst =
List.fold_left
(fun (metasenv, subst) (x,y) ->
- unify rdb test_eq_only metasenv subst context x y)
+ unify rdb test_eq_only metasenv subst context x y false)
(metasenv, subst) premises
in
pp(lazy("FUNZIONA!"));
~unify:(fun m s c t1 t2 ->
let ind = !indent in
let res =
- try Some (unify rdb false m s c t1 t2 )
+ try Some (unify rdb false m s c t1 t2 false)
with UnificationFailure _ | Uncertain _ -> None
in
indent := ind; res)
;;
-let unify rdb ?(test_eq_only=false) =
+let unify rdb ?(test_eq_only=false) ?(swap=false) metasenv subst context t1 t2=
indent := "";
- unify rdb test_eq_only;;
+ unify rdb test_eq_only metasenv subst context t1 t2 swap;;
let fix_sorts m s =
fix m s true false (UnificationFailure (lazy "no sup"))