From c0b7b5b8127955fa2cb5d70bd0a84aec50f8e015 Mon Sep 17 00:00:00 2001
From: msozeau
Date: Thu, 18 Apr 2013 15:26:08 +0000
Subject: Finer fix for bug 3017, mark unresolvability only of goals that are
 instances of metas in clenvtac. Makes Math-Classes compile again.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16429 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 pretyping/typeclasses.ml | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

(limited to 'pretyping/typeclasses.ml')

diff --git a/pretyping/typeclasses.ml b/pretyping/typeclasses.ml
index d2cd0957e8..25109ffcf0 100644
--- a/pretyping/typeclasses.ml
+++ b/pretyping/typeclasses.ml
@@ -505,23 +505,27 @@ let mark_resolvability b evi =
 let mark_unresolvable evi = mark_resolvability false evi
 let mark_resolvable evi = mark_resolvability true evi
 
-let mark_resolvability b sigma =
-  Evd.fold_undefined (fun ev evi evs ->
-    Evd.add evs ev (mark_resolvability_undef b evi))
-    sigma (Evd.defined_evars sigma)
-
-let mark_unresolvables sigma = mark_resolvability false sigma
-let mark_resolvables sigma = mark_resolvability true sigma
-
 open Evar_kinds
 type evar_filter = Evar_kinds.t -> bool
 
 let all_evars _ = true
-let no_goals = function GoalEvar -> false | _ -> true
+let all_goals = function GoalEvar -> true | _ -> false
+let no_goals evi = not (all_goals evi)
 let no_goals_or_obligations = function
   | GoalEvar | QuestionMark _ -> false
   | _ -> true
 
+let mark_resolvability filter b sigma =
+  Evd.fold_undefined 
+    (fun ev evi evs ->
+     if filter (snd evi.evar_source) then
+       Evd.add evs ev (mark_resolvability_undef b evi)
+     else Evd.add evs ev evi)
+  sigma (Evd.defined_evars sigma)
+
+let mark_unresolvables ?(filter=all_evars) sigma = mark_resolvability filter false sigma
+let mark_resolvables sigma = mark_resolvability all_evars true sigma
+
 let has_typeclasses filter evd =
   Evd.fold_undefined (fun ev evi has -> has ||
     (filter (snd evi.evar_source) && is_class_evar evd evi && is_resolvable evi))
-- 
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