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diff --git a/src/core_env.sig b/src/core_env.sig
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+(* Copyright (c) 2008, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+signature CORE_ENV = sig
+
+    val liftConInCon : int -> Core.con -> Core.con
+    val subConInCon : (int * Core.con) -> Core.con -> Core.con
+
+    val liftConInExp : int -> Core.exp -> Core.exp
+    val subConInExp : (int * Core.con) -> Core.exp -> Core.exp
+
+    val liftExpInExp : int -> Core.exp -> Core.exp
+    val subExpInExp : (int * Core.exp) -> Core.exp -> Core.exp
+
+    type env
+
+    val empty : env
+
+    exception UnboundRel of int
+    exception UnboundNamed of int
+
+    val pushKRel : env -> string -> env
+    val lookupKRel : env -> int -> string
+
+    val pushCRel : env -> string -> Core.kind -> env
+    val lookupCRel : env -> int -> string * Core.kind
+
+    val pushCNamed : env -> string -> int -> Core.kind -> Core.con option -> env
+    val lookupCNamed : env -> int -> string * Core.kind * Core.con option
+
+    val pushDatatype : env -> string -> int -> string list -> (string * int * Core.con option) list -> env
+    val lookupDatatype : env -> int -> string * string list * (string * int * Core.con option) list
+
+    val lookupConstructor : env -> int -> string * string list * Core.con option * int
+
+    val pushERel : env -> string -> Core.con -> env
+    val lookupERel : env -> int -> string * Core.con
+
+    val pushENamed : env -> string -> int -> Core.con -> Core.exp option -> string -> env
+    val lookupENamed : env -> int -> string * Core.con * Core.exp option * string
+
+    val declBinds : env -> Core.decl -> env
+    val patBinds : env -> Core.pat -> env
+
+    val patBindsN : Core.pat -> int
+    val patBindsL : Core.pat -> (string * Core.con) list
+                                                 
+end