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diff --git a/checker/modops.mli b/checker/modops.mli
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(*i $Id: modops.mli 9821 2007-05-11 17:00:58Z aspiwack $ i*)
+
+(*i*)
+open Util
+open Names
+open Univ
+open Term
+open Declarations
+open Environ
+(*i*)
+
+(* Various operations on modules and module types *)
+
+(* make the environment entry out of type *)
+val module_body_of_type : module_type_body -> module_body
+
+val module_type_of_module : module_path option -> module_body -> 
+  module_type_body 
+
+val destr_functor : 
+  env -> struct_expr_body -> mod_bound_id * module_type_body * struct_expr_body
+
+(* Evaluation functions *)
+val eval_struct : env -> struct_expr_body -> struct_expr_body
+
+val type_of_mb : env -> module_body -> struct_expr_body
+
+(* [add_signature mp sign env] assumes that the substitution [msid]
+   $\mapsto$ [mp] has already been performed (or is not necessary, like
+   when [mp = MPself msid]) *)
+val add_signature : module_path -> structure_body -> env -> env
+
+(* adds a module and its components, but not the constraints *)
+val add_module : module_path -> module_body ->  env -> env
+
+val check_modpath_equiv : env -> module_path -> module_path -> unit
+
+val strengthen : env -> struct_expr_body -> module_path -> struct_expr_body
+
+val update_subst : env -> module_body -> module_path -> bool * substitution
+
+val error_incompatible_modtypes : 
+  module_type_body -> module_type_body -> 'a
+
+val error_not_match : label -> structure_field_body -> 'a
+
+val error_with_incorrect : label -> 'a
+
+val error_no_such_label : label -> 'a
+
+val error_no_such_label_sub :
+  label -> mod_self_id -> mod_self_id -> 'a
+
+val error_signature_expected : struct_expr_body -> 'a
+
+val error_not_a_constant : label -> 'a
+
+val error_not_a_module : label -> 'a 
+
+val error_a_generative_module_expected : label -> 'a
+
+val error_application_to_not_path : struct_expr_body -> 'a