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diff --git a/proofs/proof_trees.mli b/proofs/proof_trees.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: proof_trees.mli,v 1.27.2.1 2004/07/16 19:30:49 herbelin Exp $ i*)
+
+(*i*)
+open Util
+open Names
+open Term
+open Sign
+open Evd
+open Environ
+open Proof_type
+(*i*)
+
+(* This module declares readable constraints, and a few utilities on
+   constraints and proof trees *)
+
+val mk_goal : named_context -> constr -> goal
+
+val rule_of_proof     : proof_tree -> rule
+val ref_of_proof      : proof_tree -> (rule * proof_tree list)
+val children_of_proof : proof_tree -> proof_tree list
+val goal_of_proof     : proof_tree -> goal
+val subproof_of_proof : proof_tree -> proof_tree
+val status_of_proof   : proof_tree -> int
+val is_complete_proof : proof_tree -> bool
+val is_leaf_proof     : proof_tree -> bool
+val is_tactic_proof   : proof_tree -> bool
+
+(*s A readable constraint is a global constraint plus a focus set
+    of existential variables and a signature. *)
+
+val rc_of_gc  : evar_map -> goal -> named_context sigma
+val rc_add    : named_context sigma -> existential_key * goal -> 
+  named_context sigma
+val get_hyps  : named_context sigma -> named_context
+val get_env   : named_context sigma -> env
+val get_gc    : named_context sigma -> evar_map
+
+val pf_lookup_name_as_renamed  : env -> constr -> identifier -> int option
+val pf_lookup_index_as_renamed : env -> constr -> int -> int option
+
+
+(*s Pretty printing functions. *)
+
+(*i*)
+open Pp
+(*i*)
+
+val pr_goal      : goal -> std_ppcmds
+val pr_subgoals  : goal list -> std_ppcmds
+val pr_subgoal   : int -> goal list -> std_ppcmds
+
+val pr_decl      : goal -> std_ppcmds
+val pr_decls     : evar_map -> std_ppcmds
+val pr_evc       : named_context sigma -> std_ppcmds
+
+val prgl         : goal -> std_ppcmds
+val pr_seq       : goal -> std_ppcmds
+val pr_evars     : (existential_key * goal) list -> std_ppcmds
+val pr_evars_int : int -> (existential_key * goal) list -> std_ppcmds
+val pr_subgoals_existential : evar_map -> goal list -> std_ppcmds