From 5ef28823729e4e409c98689840dc61da90749a78 Mon Sep 17 00:00:00 2001
From: msozeau
Date: Fri, 11 Feb 2011 13:13:18 +0000
Subject: Change Evd.fold to a faster version that simply removes unneeded
 evars.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13830 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 tactics/rewrite.ml4 | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/tactics/rewrite.ml4 b/tactics/rewrite.ml4
index 437fb4e328..89a8a5389f 100644
--- a/tactics/rewrite.ml4
+++ b/tactics/rewrite.ml4
@@ -966,12 +966,8 @@ let cl_rewrite_clause_aux ?(abs=None) strat env avoid sigma concl is_hyp : resul
 	let evars = (* Keep only original evars (potentially instantiated) and goal evars,
 		       the rest has been defined and substituted already. *)
 	  let cstrs = cstrevars evars in
-	  Evd.fold
-	    (fun ev evi acc ->
-	       if not (Evd.mem cstrs ev) then
-		 Evd.add acc ev evi
-	       else acc)
-	    evars' Evd.empty
+	    (* cstrs is small *)
+	    Evd.fold (fun ev evi acc -> Evd.remove acc ev) cstrs evars'
 	in
 	let res =
 	  match is_hyp with
@@ -992,16 +988,9 @@ let cl_rewrite_clause_aux ?(abs=None) strat env avoid sigma concl is_hyp : resul
 	      (match p with
 	       | RewPrf (rel, p) ->
 		   (match abs with
-		    | None ->
-(* 			let undef, evar = Evarutil.new_evar undef env newt in *)
-(* 			  Some (undef, Some (mkApp (p, [| evar |])), newt) *)
-			Some (evars, Some p, newt)
+		    | None -> Some (evars, Some p, newt)
 		    | Some (t, ty) ->
-			(* 			let undef, evar = Evarutil.new_evar undef env newt in *)
-			(* 			let proof = subst1 t p in *)
-			let proof = mkApp (mkLambda (Name (id_of_string "lemma"), ty, p),
-					   [| t |])
-			in
+			let proof = mkApp (mkLambda (Name (id_of_string "lemma"), ty, p), [| t |]) in
 			  Some (evars, Some proof, newt))
 	       | RewCast c -> Some (evars, None, newt))
 	in Some res
-- 
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