Removed spurious try/with in Proofview.Notation.(>>=) and (>>==).

They were a hack to avoid looking where exceptions were raised and not
caught. Hopefully I produce a cleaner stack now, catching errors when
it is needed.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16980 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 16 insertions, 12 deletions

diff --git a/plugins/setoid_ring/newring.ml4 b/plugins/setoid_ring/newring.ml4
index 010a550f0c..7bd0c7e43d 100644
--- a/plugins/setoid_ring/newring.ml4
+++ b/plugins/setoid_ring/newring.ml4
@@ -800,12 +800,14 @@ open Proofview.Notations
 let ring_lookup (f:glob_tactic_expr) lH rl t =
   Proofview.tclEVARMAP >= fun sigma ->
   Proofview.Goal.env >>= fun env ->
-  let rl = make_args_list rl t in
-  let e = find_ring_structure env sigma rl in
-  let rl = carg (make_term_list e.ring_carrier rl) in
-  let lH = carg (make_hyp_list env lH) in
-  let ring = ltac_ring_structure e in
-  ltac_apply f (ring@[lH;rl])
+  try (* find_ring_strucure can raise an exception *)
+    let rl = make_args_list rl t in
+    let e = find_ring_structure env sigma rl in
+    let rl = carg (make_term_list e.ring_carrier rl) in
+    let lH = carg (make_hyp_list env lH) in
+    let ring = ltac_ring_structure e in
+    ltac_apply f (ring@[lH;rl])
+  with e when Proofview.V82.catchable_exception e -> Proofview.tclZERO e
 
 TACTIC EXTEND ring_lookup
 | [ "ring_lookup" tactic0(f) "[" constr_list(lH) "]" ne_constr_list(lrt) ] ->
@@ -1121,12 +1123,14 @@ let ltac_field_structure e =
 let field_lookup (f:glob_tactic_expr) lH rl t =
   Proofview.tclEVARMAP >= fun sigma ->
   Proofview.Goal.env >>= fun env ->
-  let rl = make_args_list rl t in
-  let e = find_field_structure env sigma rl in
-  let rl = carg (make_term_list e.field_carrier rl) in
-  let lH = carg (make_hyp_list env lH) in
-  let field = ltac_field_structure e in
-  ltac_apply f (field@[lH;rl])
+  try
+    let rl = make_args_list rl t in
+    let e = find_field_structure env sigma rl in
+    let rl = carg (make_term_list e.field_carrier rl) in
+    let lH = carg (make_hyp_list env lH) in
+    let field = ltac_field_structure e in
+    ltac_apply f (field@[lH;rl])
+  with e when Proofview.V82.catchable_exception e -> Proofview.tclZERO e
 
 
 TACTIC EXTEND field_lookup