module C = NCic
module Ref = NReference
+module E = NCicEnvironment
module type Strategy = sig
type stack_term
let (===) x y = Pervasives.compare x y = 0 ;;
(* t1, t2 must be well-typed *)
-let are_convertible ?(subst=[]) =
+let are_convertible ?(subst=[]) get_relevance =
let rec aux test_eq_only context t1 t2 =
let rec alpha_eq test_eq_only t1 t2 =
if t1 === t2 then
| (C.Prod (name1,s1,t1), C.Prod(_,s2,t2)) ->
aux true context s1 s2 &&
aux test_eq_only ((name1, C.Decl s1)::context) t1 t2
- | (C.Lambda (name1,s1,t1), C.Lambda(_,s2,t2)) ->
- aux true context s1 s2 &&
+ | (C.Lambda (name1,s1,t1), C.Lambda(_,_,t2)) ->
+ (* thanks to inversion of well typedness, the source
+ * of these lambdas must be already convertible *)
aux test_eq_only ((name1, C.Decl s1)::context) t1 t2
| (C.LetIn (name1,ty1,s1,t1), C.LetIn(_,ty2,s2,t2)) ->
aux test_eq_only context ty1 ty2 &&
aux test_eq_only context t1 term
with NCicUtils.Subst_not_found _ -> false)
- | (C.Appl (C.Const r1::tl1), C.Appl (C.Const r2::tl2)) ->
- r1 = r2 &&
- let relevance = NCicEnvironment.get_relevance r1 in
+ | (C.Appl (hd1::tl1), C.Appl (hd2::tl2)) ->
+ aux test_eq_only context hd1 hd2 &&
+ let relevance = get_relevance ~subst context hd1 tl1 in
(try
HExtlib.list_forall_default3
(fun t1 t2 b -> not b || aux test_eq_only context t1 t2)
tl1 tl2 true relevance
with Invalid_argument _ -> false)
- | (C.Appl l1, C.Appl l2) ->
- (try List.for_all2 (aux test_eq_only context) l1 l2
- with Invalid_argument _ -> false)
-
- | (C.Match (ref1,outtype1,term1,pl1),
- C.Match (ref2,outtype2,term2,pl2)) ->
+ | (C.Match (Ref.Ref (_,Ref.Ind (_,tyno,_)) as ref1,outtype1,term1,pl1),
+ C.Match (ref2,outtype2,term2,pl2)) ->
+ let _,_,itl,_,_ = E.get_checked_indtys ref1 in
+ let _,_,ty,_ = List.nth itl tyno in
+ let rec remove_prods ~subst context ty =
+ let ty = whd ~subst context ty in
+ match ty with
+ | C.Sort _ -> ty
+ | C.Prod (name,so,ta) -> remove_prods ~subst ((name,(C.Decl so))::context) ta
+ | _ -> assert false
+ in
+ let is_prop =
+ match remove_prods ~subst [] ty with
+ | C.Sort C.Prop -> true
+ | _ -> false
+ in
Ref.eq ref1 ref2 &&
aux test_eq_only context outtype1 outtype2 &&
- aux test_eq_only context term1 term2 &&
+ (is_prop || aux test_eq_only context term1 term2) &&
(try List.for_all2 (aux test_eq_only context) pl1 pl2
with Invalid_argument _ -> false)
-
| (C.Implicit _, _) | (_, C.Implicit _) -> assert false
| (_,_) -> false
in