Start of elaboration

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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.
+ *)
+
+structure Elab = struct
+
+type 'a located = 'a ErrorMsg.located
+
+datatype kind' =
+         KType
+       | KArrow of kind * kind
+       | KName
+       | KRecord of kind
+
+       | KError
+       | KUnif of string * kind option ref
+
+withtype kind = kind' located
+
+datatype explicitness =
+         Explicit
+       | Implicit
+
+datatype con' =
+         TFun of con * con
+       | TCFun of explicitness * string * kind * con
+       | TRecord of con
+
+       | CRel of int
+       | CNamed of int
+       | CApp of con * con
+       | CAbs of explicitness * string * kind * con
+
+       | CName of string
+
+       | CRecord of kind * (con * con) list
+       | CConcat of con * con
+
+       | CError
+       | CUnif of string * con option ref
+
+withtype con = con' located
+
+datatype decl' =
+         DCon of string * kind * con
+
+withtype decl = decl' located
+
+type file = decl list
+
+end