From 7cfc4e5146be5666419451bdd516f1f3f264d24a Mon Sep 17 00:00:00 2001
From: Enrico Tassi <gareuselesinge@debian.org>
Date: Sun, 25 Jan 2015 14:42:51 +0100
Subject: Imported Upstream version 8.5~beta1+dfsg

---
 proofs/evar_refiner.ml | 58 +++++++++++++++++++++++++++++---------------------
 1 file changed, 34 insertions(+), 24 deletions(-)

(limited to 'proofs/evar_refiner.ml')

diff --git a/proofs/evar_refiner.ml b/proofs/evar_refiner.ml
index 6548a1dd..c8cb1d1c 100644
--- a/proofs/evar_refiner.ml
+++ b/proofs/evar_refiner.ml
@@ -1,61 +1,71 @@
 (************************************************************************)
 (*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
-(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2014     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
 (*   \VV/  **************************************************************)
 (*    //   *      This file is distributed under the terms of the       *)
 (*         *       GNU Lesser General Public License Version 2.1        *)
 (************************************************************************)
 
+open Errors
 open Util
 open Names
-open Term
 open Evd
 open Evarutil
-open Sign
-open Refiner
+open Evarsolve
 
 (******************************************)
 (* Instantiation of existential variables *)
 (******************************************)
 
 let depends_on_evar evk _ (pbty,_,t1,t2) =
-  try head_evar t1 = evk
+  try Evar.equal (head_evar t1) evk
   with NoHeadEvar ->
-  try head_evar t2 = evk
+  try Evar.equal (head_evar t2) evk
   with NoHeadEvar -> false
 
-let define_and_solve_constraints evk c evd =
-  try
-    let evd = define evk c evd in
-    let (evd,pbs) = extract_changed_conv_pbs evd (depends_on_evar evk) in
-    fst (List.fold_left
-      (fun (evd,b as p) (pbty,env,t1,t2) ->
-	if b then Evarconv.evar_conv_x full_transparent_state env evd pbty t1 t2 else p) (evd,true)
-      pbs)
-  with e when Pretype_errors.precatchable_exception e ->
-    error "Instance does not satisfy constraints."
+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_env evi in
+  let env = Evd.evar_filtered_env evi in
   let sigma',typed_c =
-    try Pretyping.Default.understand_ltac ~resolve_classes:true true sigma env ltac_var
-	  (Pretyping.OfType (Some evi.evar_concl)) rawc
+    let flags = {
+      Pretyping.use_typeclasses = true;
+      Pretyping.use_unif_heuristics = 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 Errors.noncritical e ->
-      let loc = Glob_term.loc_of_glob_constr rawc in
+      let loc = Glob_ops.loc_of_glob_constr rawc in
       user_err_loc
         (loc,"",Pp.str ("Instance is not well-typed in the environment of " ^
 			string_of_existential evk))
   in
-  define_and_solve_constraints evk typed_c (evars_reset_evd sigma' sigma)
+  define_and_solve_constraints evk typed_c env (evars_reset_evd sigma' sigma)
 
 (* vernac command Existential *)
 
 (* Main component of vernac command Existential *)
 let instantiate_pf_com evk com sigma =
   let evi = Evd.find sigma evk in
-  let env = Evd.evar_env evi in
-  let rawc = Constrintern.intern_constr sigma env com in
-  let sigma' = w_refine (evk,evi) (([],[]),rawc) sigma in
+  let env = Evd.evar_filtered_env evi in
+  let rawc = Constrintern.intern_constr env com in
+  let ltac_vars = Pretyping.empty_lvar in
+  let sigma' = w_refine (evk, evi) (ltac_vars, rawc) sigma in
   sigma'
-- 
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