From 9eeb0905d1d6f2c9e7b9be83660335838d2c1295 Mon Sep 17 00:00:00 2001
From: msozeau
Date: Thu, 27 Mar 2008 00:57:38 +0000
Subject: Various fixes on typeclasses: - Better interface in constrintern
 w.r.t. evars used during typechecking - Add "unsatisfiable_constraints"
 exception which gives back the raw evar_map that was not satisfied during
 typeclass search (presentation could be improved). - Correctly infer the
 minimal sort for typeclasses declared as definitions (everything was in type
 before). - Really handle priorities in typeclass eauto: goals produced with
 higher priority (lowest number) instances are tried before other of lower
 priority goals, regardless of the number of subgoals. - Change inverse to a
 notation for flip, now that universe polymorphic definitions are handled
 correctly. - Add EquivalenceDec class similar to SetoidDec, declaring
 decision procedures for equivalences.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@10724 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 pretyping/typeclasses_errors.ml | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'pretyping/typeclasses_errors.ml')

diff --git a/pretyping/typeclasses_errors.ml b/pretyping/typeclasses_errors.ml
index 1648f667ab..4db8261085 100644
--- a/pretyping/typeclasses_errors.ml
+++ b/pretyping/typeclasses_errors.ml
@@ -28,6 +28,7 @@ type typeclass_error =
     | NotAClass of constr
     | UnboundMethod of global_reference * identifier located (* Class name, method *)
     | NoInstance of identifier located * constr list
+    | UnsatisfiableConstraints of evar_map
     | MismatchedContextInstance of contexts * constr_expr list * named_context (* found, expected *)
 
 exception TypeClassError of env * typeclass_error
@@ -40,4 +41,6 @@ let unbound_method env cid id = typeclass_error env (UnboundMethod (cid, id))
 
 let no_instance env id args = typeclass_error env (NoInstance (id, args))
 
+let unsatisfiable_constraints env evm = typeclass_error env (UnsatisfiableConstraints evm)
+
 let mismatched_ctx_inst env c n m = typeclass_error env (MismatchedContextInstance (c, n, m))
-- 
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