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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(* $Id$ *)
open Util
open Names
open Term
open Evd
open Sign
open Proof_trees
open Refiner
(******************************************)
(* Instantiation of existential variables *)
(******************************************)
(* w_tactic pour instantiate *)
let w_refine ev rawc evd =
if Evd.is_defined (evars_of evd) ev then
error "Instantiate called on already-defined evar";
let e_info = Evd.find (evars_of evd) ev in
let env = Evd.evar_env e_info in
let sigma,typed_c =
try Pretyping.Default.understand_tcc (evars_of evd) env
~expected_type:e_info.evar_concl rawc
with _ -> error ("The term is not well-typed in the environment of " ^
string_of_existential ev)
in
evar_define ev typed_c (evars_reset_evd sigma evd)
(* vernac command Existential *)
let instantiate_pf_com n com pfts =
let gls = top_goal_of_pftreestate pfts in
let sigma = gls.sigma in
let (sp,evi) (* as evc *) =
let evl = Evarutil.non_instantiated sigma in
if (n <= 0) then
error "incorrect existential variable index"
else if List.length evl < n then
error "not so many uninstantiated existential variables"
else
List.nth evl (n-1)
in
let env = Evd.evar_env evi in
let rawc = Constrintern.intern_constr sigma env com in
let evd = create_goal_evar_defs sigma in
let evd' = w_refine sp rawc evd in
change_constraints_pftreestate (evars_of evd') pfts
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