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bug in object subtyping + subtyping forget constraints 

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@7023 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
master
Jacques Garrigue 2005-08-17 05:38:23 +00:00
parent c78bc94a7a
commit 5bef38ba93
1 changed files with 29 additions and 20 deletions
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41
typing/ctype.ml
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@ -219,10 +219,15 @@ let associate_fields fields1 fields2 =
(**** Check whether an object is open ****)
(* +++ Il faudra penser a eventuellement expanser l'abreviation *)
let rec opened_object ty =
match (repr ty).desc with
Tobject (t, _) -> opened_object t
| Tfield(_, _, _, t) -> opened_object t
let rec object_row ty =
let ty = repr ty in
match ty.desc with
Tobject (t, _) -> object_row t
| Tfield(_, _, _, t) -> object_row t
| _ -> ty
let opened_object ty =
match (object_row ty).desc with
| Tvar -> true
| Tunivar -> true
| Tconstr _ -> true
@ -2829,7 +2834,7 @@ let subtype_error env trace =
let rec subtype_rec env trace t1 t2 cstrs =
let t1 = repr t1 in
let t2 = repr t2 in
if t1 == t2 then [] else
if t1 == t2 then cstrs else
begin try
TypePairs.find subtypes (t1, t2);
@ -2869,7 +2874,7 @@ let rec subtype_rec env trace t1 t2 cstrs =
(trace, t1, t2, !univar_pairs)::cstrs
end
| (Tobject (f1, _), Tobject (f2, _))
when opened_object f1 && opened_object f2 || has_constr_row t2 ->
when (object_row f1).desc = Tvar && (object_row f2).desc = Tvar ->
(* Same row variable implies same object. *)
(trace, t1, t2, !univar_pairs)::cstrs
| (Tobject (f1, _), Tobject (f2, _)) ->
@ -2920,20 +2925,24 @@ and subtype_fields env trace ty1 ty2 cstrs =
let (fields1, rest1) = flatten_fields ty1 in
let (fields2, rest2) = flatten_fields ty2 in
let (pairs, miss1, miss2) = associate_fields fields1 fields2 in
let cstrs =
if rest2.desc = Tnil then cstrs else
if miss1 = [] then
subtype_rec env ((rest1, rest2)::trace) rest1 rest2 cstrs
else
(trace, build_fields (repr ty1).level miss1 rest1, rest2,
!univar_pairs) :: cstrs
in
let cstrs =
if miss2 = [] then cstrs else
(trace, rest1, build_fields (repr ty2).level miss2 (newvar ()),
!univar_pairs)
::
begin match rest2.desc with
Tnil -> []
| _ ->
[trace, build_fields (repr ty1).level miss1 rest1, rest2, !univar_pairs]
end
@
(List.fold_left
!univar_pairs) :: cstrs
in
List.fold_left
(fun cstrs (_, k1, t1, k2, t2) ->
(* Theses fields are always present *)
subtype_rec env ((t1, t2)::trace) t1 t2 cstrs)
cstrs pairs)
cstrs pairs
let subtype env ty1 ty2 =
TypePairs.clear subtypes;