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|
(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
open CErrors
open Util
open Names
open Evd
open Evarutil
open Evarsolve
open Pp
open Glob_term
open Ltac_pretype
(******************************************)
(* Instantiation of existential variables *)
(******************************************)
type glob_constr_ltac_closure = ltac_var_map * glob_constr
let depends_on_evar sigma evk _ (pbty,_,t1,t2) =
let t1 = EConstr.of_constr t1 in
let t2 = EConstr.of_constr t2 in
try Evar.equal (head_evar sigma t1) evk
with NoHeadEvar ->
try Evar.equal (head_evar sigma t2) evk
with NoHeadEvar -> false
let define_and_solve_constraints evk c env evd =
if Termops.occur_evar evd evk c then
Pretype_errors.error_occur_check env evd evk c;
let evd = define evk (EConstr.Unsafe.to_constr c) evd in
let (evd,pbs) = extract_changed_conv_pbs evd (depends_on_evar evd evk) in
match
List.fold_left
(fun p (pbty,env,t1,t2) -> match p with
| Success evd -> Evarconv.evar_conv_x full_transparent_state env evd pbty (EConstr.of_constr t1) (EConstr.of_constr t2)
| UnifFailure _ as x -> x) (Success evd)
pbs
with
| Success evd -> evd
| UnifFailure _ -> user_err Pp.(str "Instance does not satisfy the constraints.")
let w_refine (evk,evi) (ltac_var,rawc) sigma =
if Evd.is_defined sigma evk then
user_err Pp.(str "Instantiate called on already-defined evar");
let env = Evd.evar_filtered_env evi in
let sigma',typed_c =
let flags = {
Pretyping.use_typeclasses = true;
Pretyping.solve_unification_constraints = true;
Pretyping.use_hook = None;
Pretyping.fail_evar = false;
Pretyping.expand_evars = true } in
try Pretyping.understand_ltac flags
env sigma ltac_var (Pretyping.OfType (EConstr.of_constr evi.evar_concl)) rawc
with e when CErrors.noncritical e ->
let loc = Glob_ops.loc_of_glob_constr rawc in
user_err ?loc
(str "Instance is not well-typed in the environment of " ++
Termops.pr_existential_key sigma evk ++ str ".")
in
define_and_solve_constraints evk typed_c env (evars_reset_evd sigma' sigma)
|
