+ let u,typ,term, metasenv =
+ let context_of_t, (t, metasenv, u) =
+ match terms_with_context, term with
+ [], None ->
+ raise
+ UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly
+ | [], Some t -> context, t context metasenv u
+ | (context_of_t, _)::_, Some t ->
+ context_of_t, t context_of_t metasenv u
+ | (context_of_t, t)::_, None -> context_of_t, (t, metasenv, u)
+ in
+ let t,subst,metasenv' =
+ try
+ CicMetaSubst.delift_rels [] metasenv
+ (List.length context_of_t - List.length context) t
+ with
+ CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+ raise TheSelectedTermsMustLiveInTheGoalContext in
+ (*CSC: I am not sure about the following two assertions;
+ maybe I need to propagate the new subst and metasenv *)
+ assert (subst = []);
+ assert (metasenv' = metasenv);
+ let typ,u = CicTypeChecker.type_of_aux' ~subst metasenv context t u in
+ u,typ,t,metasenv
+ in
+ (* We need to check:
+ 1. whether they live in the context of the goal;
+ if they do they are also well-typed since they are closed subterms
+ of a well-typed term in the well-typed context of the well-typed
+ term
+ 2. whether they are convertible
+ *)
+ ignore (
+ (* TASSI: FIXME *)
+ List.fold_left
+ (fun u (context_of_t,t) ->
+ (* 1 *)
+ let t,subst,metasenv' =
+ try
+ CicMetaSubst.delift_rels [] metasenv
+ (List.length context_of_t - List.length context) t
+ with
+ CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+ raise TheSelectedTermsMustLiveInTheGoalContext in
+ (*CSC: I am not sure about the following two assertions;
+ maybe I need to propagate the new subst and metasenv *)
+ assert (subst = []);
+ assert (metasenv' = metasenv);
+ (* 2 *)
+ let b,u1 = CicReduction.are_convertible ~subst context term t u in
+ if not b then
+ raise AllSelectedTermsMustBeConvertible
+ else
+ u1
+ ) u terms_with_context) ;
+ PET.apply_tactic
+ (T.thens
+ ~start:
+ (P.cut_tac
+ (C.Prod(
+ (mk_fresh_name_callback metasenv context C.Anonymous ~typ:typ),
+ typ,
+ (ProofEngineReduction.replace_lifting_csc 1
+ ~equality:(==)
+ ~what:(List.map snd terms_with_context)
+ ~with_what:(List.map (function _ -> C.Rel 1) terms_with_context)
+ ~where:ty)
+ )))
+ ~continuations:
+ [(P.apply_tac ~term:(C.Appl [C.Rel 1; CicSubstitution.lift 1 term])) ;
+ T.id_tac])
+ status
+ in
+ PET.mk_tactic (generalize_tac mk_fresh_name_callback ~pattern)