* http://cs.unibo.it/helm/.
*)
-(*
+
module PEH = ProofEngineHelpers
-*)
module U = CicUniv
module TC = CicTypeChecker
module PET = ProofEngineTypes
module PESR = ProofEngineStructuralRules
let fail_msg0 = "unexported clearbody: invalid argument"
-let fail_msg1 = "fwd: argument is not premise in the current goal"
let fail_msg2 = "fwd: no applicable simplification"
let error msg = raise (PET.Fail msg)
let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
let lemma = FNG.clean_dummy_dependent_types lemma in
let metasenv, metas, conts = strip_prods metasenv context ?how_many to_what lemma in
- let conclusion = Cic.Appl (what :: List.rev metas) in
+ let conclusion =
+ match metas with [] -> what | _ -> Cic.Appl (what :: List.rev metas)
+ in
let tac = T.thens ~start:(letin_tac conclusion)
~continuations:[clearbody ~index:1]
in
(* fwd **********************************************************************)
let fwd_simpl_tac
- ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
- ~dbd hyp
- =
- let find_type metasenv context =
- let rec aux p = function
- | Some (Cic.Name name, Cic.Decl t) :: _ when name = hyp -> p, t
- | Some (Cic.Name name, Cic.Def (_, Some t)) :: _ when name = hyp -> p, t
- | Some (Cic.Name name, Cic.Def (u, _)) :: tail when name = hyp ->
- p, fst (TC.type_of_aux' metasenv tail u U.empty_ugraph)
- | _ :: tail -> aux (succ p) tail
- | [] -> error fail_msg1
- in
- aux 1 context
- in
+ ?(mk_fresh_name_callback = FNG.mk_fresh_name ~subst:[])
+ ~dbd hyp =
let lapply_tac to_what lemma =
lapply_tac ~mk_fresh_name_callback ~how_many:1 ~to_what:[to_what] lemma
in
let (proof, goal) = status in
let _, metasenv, _, _ = proof in
let _, context, ty = CicUtil.lookup_meta goal metasenv in
- let index, major = find_type metasenv context in
+ let index, major = PEH.lookup_type metasenv context hyp in
match MetadataQuery.fwd_simpl ~dbd major with
| [] -> error fail_msg2
| uri :: _ ->