open Printf
-exception Elim_failure of string
+exception Elim_failure of string Lazy.t
exception Can_t_eliminate
-(*
-let debug_print = fun _ -> () *)
-let debug_print = prerr_endline
+let debug_print = fun _ -> ()
+(*let debug_print s = prerr_endline (Lazy.force s) *)
let counter = ref ~-1 ;;
let t = strip_left_params liftno paramsno t in
branch (uri, typeno) insource paramsno t fix head args
-let elim_of ?(sort = Cic.Type (CicUniv.fresh ())) uri typeno =
+let elim_of ~sort uri typeno =
counter := ~-1;
let (obj, univ) = (CicEnvironment.get_obj CicUniv.empty_ugraph uri) in
match obj with
let paramsno = count_pi ty in (* number of (left or right) parameters *)
let rightno = paramsno - leftno in
let dependent = (strip_pi ty <> Cic.Sort Cic.Prop) in
+let head = match strip_pi ty with Cic.Sort s -> s in
let conslen = List.length constructors in
let consno = ref (conslen + 1) in
- if (not dependent) && (sort <> Cic.Prop) && (conslen > 1) then
- raise Can_t_eliminate;
+ if
+ not
+ (CicTypeChecker.check_allowed_sort_elimination uri typeno head sort)
+ then
+ raise Can_t_eliminate;
let indty =
let indty = Cic.MutInd (uri, typeno, []) in
if paramsno = 0 then
in
add_params (fun b s t -> Cic.Lambda (b, s, t)) leftno ty cic
in
-debug_print (CicPp.ppterm eliminator_type);
-debug_print (CicPp.ppterm eliminator_body);
+(*
+debug_print (lazy (CicPp.ppterm eliminator_type));
+debug_print (lazy (CicPp.ppterm eliminator_body));
+*)
let eliminator_type =
FreshNamesGenerator.mk_fresh_names [] [] [] eliminator_type in
let eliminator_body =
FreshNamesGenerator.mk_fresh_names [] [] [] eliminator_body in
-debug_print (CicPp.ppterm eliminator_type);
-debug_print (CicPp.ppterm eliminator_body);
+(*
+debug_print (lazy (CicPp.ppterm eliminator_type));
+debug_print (lazy (CicPp.ppterm eliminator_body));
+*)
let (computed_type, ugraph) =
try
CicTypeChecker.type_of_aux' [] [] eliminator_body CicUniv.empty_ugraph
with CicTypeChecker.TypeCheckerFailure msg ->
- raise (Elim_failure (sprintf
+ raise (Elim_failure (lazy (sprintf
"type checker failure while type checking:\n%s\nerror:\n%s"
- (CicPp.ppterm eliminator_body) msg))
+ (CicPp.ppterm eliminator_body) (Lazy.force msg))))
in
if not (fst (CicReduction.are_convertible []
eliminator_type computed_type ugraph))