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(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
+(* Author: Jean-Christophe Filliâtre as part of the rebuilding of Coq
+ around a purely functional abstract type-checker, Aug 1999 *)
+(* Cleaning and lightening of the kernel by Bruno Barras, Nov 2001 *)
+(* Flag for predicativity of Set by Hugo Herbelin in Oct 2003 *)
+(* Support for virtual machine by Benjamin Grégoire in Oct 2004 *)
+(* Support for retroknowledge by Arnaud Spiwack in May 2007 *)
+(* Support for assumption dependencies by Arnaud Spiwack in May 2007 *)
+
+(* Miscellaneous maintenance by Bruno Barras, Hugo Herbelin, Jean-Marc
+ Notin, Matthieu Sozeau *)
+
+(* This file defines the type of environments on which the
+ type-checker works, together with simple related functions *)
+
open Util
open Names
open Sign