X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_disambiguation%2FdisambiguateChoices.ml;h=b7f2410366dbf783059c0449ba2b068087d58862;hb=97c2d258a5c524eb5c4b85208899d80751a2c82f;hp=9f3c554c6ec626ae5f4c2a7d3ea28c43940a6540;hpb=e20f3963028a966fc93ba0d611c4aa8341d20e2c;p=helm.git

diff --git a/helm/ocaml/cic_disambiguation/disambiguateChoices.ml b/helm/ocaml/cic_disambiguation/disambiguateChoices.ml
index 9f3c554c6..b7f241036 100644
--- a/helm/ocaml/cic_disambiguation/disambiguateChoices.ml
+++ b/helm/ocaml/cic_disambiguation/disambiguateChoices.ml
@@ -27,8 +27,7 @@ open Printf
 
 open DisambiguateTypes
 
-exception Invalid_choice
-exception Choice_not_found of string
+exception Choice_not_found of string Lazy.t
 
 let num_choices = ref []
 
@@ -41,7 +40,7 @@ let lookup_num_choices () = !num_choices
 let lookup_num_by_dsc dsc =
   try
     List.find (has_description dsc) !num_choices
-  with Not_found -> raise (Choice_not_found ("Num with dsc " ^  dsc))
+  with Not_found -> raise (Choice_not_found (lazy ("Num with dsc " ^  dsc)))
 
 let mk_choice (dsc, args, appl_pattern) =
   dsc,
@@ -52,7 +51,8 @@ let mk_choice (dsc, args, appl_pattern) =
       in
       try
         List.combine names cic_args
-      with Invalid_argument _ -> raise Invalid_choice
+      with Invalid_argument _ ->
+       raise (Invalid_choice (lazy "The notation expects a different number of arguments"))
     in
     CicNotationFwd.instantiate_appl_pattern env' appl_pattern)
 
@@ -63,5 +63,5 @@ let lookup_symbol_by_dsc symbol dsc =
         (fun (dsc', _, _) -> dsc = dsc')
         (CicNotationRew.lookup_interpretations symbol))
   with CicNotationRew.Interpretation_not_found | Not_found ->
-    raise (Choice_not_found (sprintf "Symbol %s, dsc %s" symbol dsc))
+    raise (Choice_not_found (lazy (sprintf "Symbol %s, dsc %s" symbol dsc)))