X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fcomponents%2Fgrafite_engine%2FgrafiteTypes.ml;h=7cb6bef0c37877feb62dd3bf90bd8755e181d2f1;hb=3c2b1af52212c320f6e4506d10df7077379a222c;hp=0e1b87fa1a6d949e3f36c9bd4d2d2ce1de9269a2;hpb=f9f775a550264a8dc9ce7ea9a48b79892a122c3c;p=helm.git

diff --git a/matita/components/grafite_engine/grafiteTypes.ml b/matita/components/grafite_engine/grafiteTypes.ml
index 0e1b87fa1..7cb6bef0c 100644
--- a/matita/components/grafite_engine/grafiteTypes.ml
+++ b/matita/components/grafite_engine/grafiteTypes.ml
@@ -31,7 +31,7 @@ exception Command_error of string
 
 let command_error msg = raise (Command_error msg)
 
-class status = fun (b : string) ->
+class virtual status = fun (b : string) ->
  let fake_obj =
   NUri.uri_of_string "cic:/matita/dummy.decl",0,[],[],
    NCic.Constant([],"",None,NCic.Implicit `Closed,(`Provided,`Theorem,`Regular))
@@ -52,4 +52,8 @@ class status = fun (b : string) ->
  end
 
 module Serializer =
- NCicLibrary.Serializer(struct type dumpable_status = status end)
+ NCicLibrary.Serializer(struct
+  type dumpable_s = status
+  let get status = (status : #status :> NCicLibrary.dumpable_status)
+  let set (status : dumpable_s) dump_status = status#set_dumpable_status dump_status
+ end)