1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * Copyright INRIA, CNRS and contributors *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(* \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 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) =
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 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 (Evarconv.default_flags_of TransparentState.full) env evd pbty t1 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) env sigma =
if Evd.is_defined sigma evk then
user_err Pp.(str "Instantiate called on already-defined evar");
let env = Evd.evar_filtered_env env evi in
let sigma',typed_c =
let flags = Pretyping.{
use_coercions = true;
use_typeclasses = UseTC;
solve_unification_constraints = true;
fail_evar = false;
expand_evars = true;
program_mode = false;
polymorphic = false;
} 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
(str "Instance is not well-typed in the environment of " ++
Termops.pr_existential_key env sigma evk ++ str ".")
in
define_and_solve_constraints evk typed_c env (evars_reset_evd sigma' sigma)
|
