From 29cc320bc3d54b9b4b8d78240db50cc8a878b033 Mon Sep 17 00:00:00 2001
From: Pierre-Marie Pédrot
Date: Sat, 4 Jul 2020 18:28:33 +0200
Subject: Store the default evar instance inside the evar info.

---
 engine/evd.mli | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'engine/evd.mli')

diff --git a/engine/evd.mli b/engine/evd.mli
index 679173ca72..b05b74c893 100644
--- a/engine/evd.mli
+++ b/engine/evd.mli
@@ -89,6 +89,15 @@ module Abstraction : sig
   val abstract_last : t -> t
 end
 
+module Identity :
+sig
+  type t
+  (** Identity substitutions *)
+
+  val make : econstr list -> t
+  val none : unit -> t
+end
+
 (** {6 Evar infos} *)
 
 type evar_body =
@@ -114,6 +123,9 @@ type evar_info = {
   (** Information about the evar. *)
   evar_candidates : econstr list option;
   (** List of possible solutions when known that it is a finite list *)
+  evar_identity : Identity.t;
+  (** Default evar instance, i.e. a list of Var nodes projected from the
+      filtered environment. *)
 }
 
 val make_evar : named_context_val -> etypes -> evar_info
@@ -127,6 +139,7 @@ val evar_candidates : evar_info -> constr list option
 val evar_filter : evar_info -> Filter.t
 val evar_env : env -> evar_info -> env
 val evar_filtered_env : env -> evar_info -> env
+val evar_identity_subst : evar_info -> econstr list
 
 val map_evar_body : (econstr -> econstr) -> evar_body -> evar_body
 val map_evar_info : (econstr -> econstr) -> evar_info -> evar_info
-- 
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