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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open CErrors
open Util
open Names
open Evd
open Evarutil
open Evarsolve
open Pp
(******************************************)
(* Instantiation of existential variables *)
(******************************************)
let depends_on_evar evk _ (pbty,_,t1,t2) =
try Evar.equal (head_evar t1) evk
with NoHeadEvar ->
try Evar.equal (head_evar t2) evk
with NoHeadEvar -> false
let define_and_solve_constraints evk c env evd =
if Termops.occur_evar evk c then
Pretype_errors.error_occur_check env evd evk c;
let evd = define evk c evd in
let (evd,pbs) = extract_changed_conv_pbs evd (depends_on_evar 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 t1 t2
| UnifFailure _ as x -> x) (Success evd)
pbs
with
| Success evd -> evd
| UnifFailure _ -> error "Instance does not satisfy the constraints."
let w_refine (evk,evi) (ltac_var,rawc) sigma =
if Evd.is_defined sigma evk then
error "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 evi.evar_concl) rawc
with e when CErrors.noncritical e ->
let loc = Glob_ops.loc_of_glob_constr rawc in
user_err_loc
(loc,"", str "Instance is not well-typed in the environment of " ++
pr_existential_key sigma evk ++ str ".")
in
define_and_solve_constraints evk typed_c env (evars_reset_evd sigma' sigma)
|
