From c3bb115fa765278bc3bcb3beb8c74b0fb8b35d98 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin
Date: Sat, 22 Nov 2014 15:20:04 +0100
Subject: Specific printer of Evar.Set.t for ocamldebug + more information in a
 UserError to ease debugging.

---
 dev/db                    | 1 +
 tactics/tacticMatching.ml | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/dev/db b/dev/db
index eb84065e8d..8588f62726 100644
--- a/dev/db
+++ b/dev/db
@@ -9,6 +9,7 @@ install_printer Top_printers.ppidset
 install_printer Top_printers.ppevar
 install_printer Top_printers.ppevarsubst
 install_printer Top_printers.ppexistentialfilter
+install_printer Top_printers.ppexistentialset
 install_printer Top_printers.ppintset
 install_printer Top_printers.pplab
 install_printer Top_printers.ppdir
diff --git a/tactics/tacticMatching.ml b/tactics/tacticMatching.ml
index fa1b7f1586..c662fad0be 100644
--- a/tactics/tacticMatching.ml
+++ b/tactics/tacticMatching.ml
@@ -102,7 +102,7 @@ let verify_metas_coherence env sigma (ln1,lcm) (ln,lm) =
   (merged, Id.Map.merge merge lcm lm)
 
 let matching_error =
-  Errors.UserError ("" , Pp.str "No matching clauses for match.")
+  Errors.UserError ("tactic matching" , Pp.str "No matching clauses for match.")
 
 (** A functor is introduced to share the environment and the
     evar_map. They do not change and it would be a pity to introduce
-- 
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