From 83afcfd21be0084b2eff33ffd9e2d8b785679d4a Mon Sep 17 00:00:00 2001
From: Siddharth Bhat <siddu.druid@gmail.com>
Date: Tue, 17 Jul 2018 01:14:36 +0200
Subject: change into QuestionMark default

---
 engine/evar_kinds.ml         |  6 ++++++
 engine/evar_kinds.mli        | 51 ++++++++++++++++++++++++++++++++++++++++++++
 interp/constrintern.ml       | 18 ++++------------
 pretyping/coercion.ml        |  2 +-
 pretyping/glob_ops.ml        |  4 +---
 tactics/hipattern.ml         |  4 +---
 vernac/comProgramFixpoint.ml |  4 +---
 7 files changed, 65 insertions(+), 24 deletions(-)
 create mode 100644 engine/evar_kinds.mli

diff --git a/engine/evar_kinds.ml b/engine/evar_kinds.ml
index bedfd0cbb..ea1e57254 100644
--- a/engine/evar_kinds.ml
+++ b/engine/evar_kinds.ml
@@ -30,6 +30,12 @@ type question_mark = {
      qm_record_field: record_field option;
 }
 
+let default_question_mark = {
+  qm_obligation=Define true;
+  qm_name=Anonymous;
+  qm_record_field=None;
+}
+
 type t =
   | ImplicitArg of GlobRef.t * (int * Id.t option)
      * bool (** Force inference *)
diff --git a/engine/evar_kinds.mli b/engine/evar_kinds.mli
new file mode 100644
index 000000000..4facdb200
--- /dev/null
+++ b/engine/evar_kinds.mli
@@ -0,0 +1,51 @@
+(************************************************************************)
+(*         *   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 Names
+
+(** The kinds of existential variable *)
+
+(** Should the obligation be defined (opaque or transparent (default)) or
+    defined transparent and expanded in the term? *)
+
+type obligation_definition_status = Define of bool | Expand
+
+type matching_var_kind = FirstOrderPatVar of Id.t | SecondOrderPatVar of Id.t
+
+type subevar_kind = Domain | Codomain | Body
+
+(* maybe this should be a Projection.t *)
+(* Represents missing record field *)
+type record_field = { fieldname : Constant.t; recordname : Names.inductive }
+
+type question_mark = {
+     qm_obligation: obligation_definition_status;
+     qm_name: Name.t;
+     (* Tracks if the evar represents a missing record field *)
+     qm_record_field: record_field option;
+}
+
+(* Default value of question_mark which is used most often *)
+val default_question_mark : question_mark
+
+type t =
+  | ImplicitArg of GlobRef.t * (int * Id.t option)
+     * bool (** Force inference *)
+  | BinderType of Name.t
+  | NamedHole of Id.t (* coming from some ?[id] syntax *)
+  | QuestionMark of question_mark
+  | CasesType of bool (* true = a subterm of the type *)
+  | InternalHole
+  | TomatchTypeParameter of inductive * int
+  | GoalEvar
+  | ImpossibleCase
+  | MatchingVar of matching_var_kind
+  | VarInstance of Id.t
+  | SubEvar of subevar_kind option * Evar.t
diff --git a/interp/constrintern.ml b/interp/constrintern.ml
index f7a1f3bf3..1f37d6367 100644
--- a/interp/constrintern.ml
+++ b/interp/constrintern.ml
@@ -566,11 +566,7 @@ let term_of_name = function
   | Name id -> DAst.make (GVar id)
   | Anonymous ->
        let st = Evar_kinds.Define (not (Program.get_proofs_transparency ())) in
-       DAst.make (GHole (Evar_kinds.QuestionMark {
-           Evar_kinds.qm_obligation=st;
-           Evar_kinds.qm_name=Anonymous;
-           Evar_kinds.qm_record_field=None;
-      }, IntroAnonymous, None))
+    DAst.make (GHole (Evar_kinds.QuestionMark { Evar_kinds.default_question_mark with Evar_kinds.qm_obligation=st }, IntroAnonymous, None))
 
 let traverse_binder intern_pat ntnvars (terms,_,binders,_ as subst) avoid (renaming,env) = function
  | Anonymous -> (renaming,env), None, Anonymous
@@ -1929,11 +1925,10 @@ let internalize globalenv env pattern_mode (_, ntnvars as lvar) c =
                              {fieldname=fieldname; recordname=inductive_of_constructor constructorname}
                              in
                          CAst.make ?loc @@ CHole (Some
-                 (Evar_kinds.QuestionMark {
+                 (Evar_kinds.QuestionMark { Evar_kinds.default_question_mark with
                      Evar_kinds.qm_obligation=st;
-                     Evar_kinds.qm_name=Anonymous;
                      Evar_kinds.qm_record_field=Some fieldinfo
-                             }) , IntroAnonymous, None))
+                }) , IntroAnonymous, None))
        in
        begin
 	  match fields with
@@ -2016,12 +2011,7 @@ let internalize globalenv env pattern_mode (_, ntnvars as lvar) c =
            let st = Evar_kinds.Define (not (Program.get_proofs_transparency ())) in
            (match naming with
            | IntroIdentifier id -> Evar_kinds.NamedHole id
-           | _ -> Evar_kinds.QuestionMark
-           {
-               Evar_kinds.qm_obligation=st;
-           Evar_kinds.qm_name=Anonymous;
-           Evar_kinds.qm_record_field=None;
-        })
+           | _ -> Evar_kinds.QuestionMark { Evar_kinds.default_question_mark with Evar_kinds.qm_obligation=st; })
         | Some k -> k
         in
         let solve = match solve with
diff --git a/pretyping/coercion.ml b/pretyping/coercion.ml
index 7b4b2d42f..7be05ea60 100644
--- a/pretyping/coercion.ml
+++ b/pretyping/coercion.ml
@@ -99,9 +99,9 @@ open Program
 
 let make_existential ?loc ?(opaque = not (get_proofs_transparency ())) na env evdref c =
   let src = Loc.tag ?loc (Evar_kinds.QuestionMark {
+      Evar_kinds.default_question_mark with
       Evar_kinds.qm_obligation=Evar_kinds.Define opaque;
       Evar_kinds.qm_name=na;
-      Evar_kinds.qm_record_field=None;
   }) in
   let evd, v = Evarutil.new_evar env !evdref ~src c in
   evdref := evd;
diff --git a/pretyping/glob_ops.ml b/pretyping/glob_ops.ml
index 9ed0090ed..24eb66682 100644
--- a/pretyping/glob_ops.ml
+++ b/pretyping/glob_ops.ml
@@ -563,9 +563,7 @@ let rec glob_constr_of_cases_pattern_aux isclosed x = DAst.map_with_loc (fun ?lo
       GVar id
   | PatVar Anonymous when not isclosed ->
       GHole (Evar_kinds.QuestionMark {
-          Evar_kinds.qm_obligation=Define false;
-          Evar_kinds.qm_name=Anonymous;
-          Evar_kinds.qm_record_field=None;
+        Evar_kinds.default_question_mark with Evar_kinds.qm_obligation=Define false;
       },Namegen.IntroAnonymous,None)
   | _ -> raise Not_found
   ) x
diff --git a/tactics/hipattern.ml b/tactics/hipattern.ml
index 9d2288346..7da059ae3 100644
--- a/tactics/hipattern.ml
+++ b/tactics/hipattern.ml
@@ -264,9 +264,7 @@ let mkPattern c = snd (Patternops.pattern_of_glob_constr c)
 let mkGApp f args = DAst.make @@ GApp (f, args)
 let mkGHole = DAst.make @@
   GHole (QuestionMark {
-      Evar_kinds.qm_obligation=Define false;
-      Evar_kinds.qm_name=Anonymous;
-      Evar_kinds.qm_record_field=None
+        Evar_kinds.default_question_mark with Evar_kinds.qm_obligation=Define false;
   }, Namegen.IntroAnonymous, None)
 let mkGProd id c1 c2 = DAst.make @@
   GProd (Name (Id.of_string id), Explicit, c1, c2)
diff --git a/vernac/comProgramFixpoint.ml b/vernac/comProgramFixpoint.ml
index 00d14f5b0..102a98f04 100644
--- a/vernac/comProgramFixpoint.ml
+++ b/vernac/comProgramFixpoint.ml
@@ -188,9 +188,7 @@ let build_wellfounded (recname,pl,n,bl,arityc,body) poly r measure notation =
     let sigma, h_a_term = Evarutil.new_global sigma (delayed_force fix_sub_ref) in
     let sigma, h_e_term = Evarutil.new_evar env sigma
         ~src:(Loc.tag @@ Evar_kinds.QuestionMark {
-            Evar_kinds.qm_obligation=Evar_kinds.Define false;
-            Evar_kinds.qm_name=Anonymous;
-            Evar_kinds.qm_record_field=None;
+            Evar_kinds.default_question_mark with Evar_kinds.qm_obligation=Evar_kinds.Define false;
         }) wf_proof in
     sigma, mkApp (h_a_term, [| argtyp ; wf_rel ; h_e_term; prop |])
   in
-- 
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