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+(* Copyright (c) 2008-2011, 2014, 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
+       | KUnit
+       | KTuple of kind list
+
+       | KError
+       | KUnif of ErrorMsg.span * string * kunif ref
+       | KTupleUnif of ErrorMsg.span * (int * kind) list * kunif ref
+
+       | KRel of int
+       | KFun of string * kind
+
+and kunif =
+    KUnknown of kind -> bool (* Is the kind a valid unification? *)
+  | KKnown of kind
+
+withtype kind = kind' located
+
+datatype explicitness =
+         Explicit
+       | Implicit
+
+datatype con' =
+         TFun of con * con
+       | TCFun of explicitness * string * kind * con
+       | TRecord of con
+       | TDisjoint of con * con * con
+
+       | CRel of int
+       | CNamed of int
+       | CModProj of int * string list * string
+       | CApp of con * con
+       | CAbs of string * kind * con
+
+       | CKAbs of string * con
+       | CKApp of con * kind
+       | TKFun of string * con
+
+       | CName of string
+
+       | CRecord of kind * (con * con) list
+       | CConcat of con * con
+       | CMap of kind * kind
+
+       | CUnit
+
+       | CTuple of con list
+       | CProj of con * int
+
+       | CError
+       | CUnif of int * ErrorMsg.span * kind * string * cunif ref
+
+and cunif =
+    Unknown of con -> bool (* Is the constructor a valid unification? *)
+  | Known of con
+
+withtype con = con' located
+
+datatype datatype_kind = datatype DatatypeKind.datatype_kind
+
+datatype patCon =
+         PConVar of int
+       | PConProj of int * string list * string
+
+datatype pat' =
+         PVar of string * con
+       | PPrim of Prim.t
+       | PCon of datatype_kind * patCon * con list * pat option
+       | PRecord of (string * pat * con) list
+
+withtype pat = pat' located
+
+datatype exp' =
+         EPrim of Prim.t
+       | ERel of int
+       | ENamed of int
+       | EModProj of int * string list * string
+       | EApp of exp * exp
+       | EAbs of string * con * con * exp
+       | ECApp of exp * con
+       | ECAbs of explicitness * string * kind * exp
+
+       | EKAbs of string * exp
+       | EKApp of exp * kind
+
+       | ERecord of (con * exp * con) list
+       | EField of exp * con * { field : con, rest : con }
+       | EConcat of exp * con * exp * con
+       | ECut of exp * con * { field : con, rest : con }
+       | ECutMulti of exp * con * { rest : con }
+
+       | ECase of exp * (pat * exp) list * { disc : con, result : con }
+
+       | EError
+       | EUnif of exp option ref
+
+       | ELet of edecl list * exp * con
+
+and edecl' =
+    EDVal of pat * con * exp
+  | EDValRec of (string * con * exp) list
+
+withtype exp = exp' located
+     and edecl = edecl' located
+
+(* We have to be careful about crawling automatically generated signatures recursively,
+ * importing all type-class instances that we find.
+ * The reason is that selfification will add signatures of anonymous structures,
+ * and it's counterintuitive for instances to escape anonymous structures! *)
+datatype import_mode = Import | Skip
+
+datatype sgn_item' =
+         SgiConAbs of string * int * kind
+       | SgiCon of string * int * kind * con
+       | SgiDatatype of (string * int * string list * (string * int * con option) list) list
+       | SgiDatatypeImp of string * int * int * string list * string * string list * (string * int * con option) list
+       | SgiVal of string * int * con
+       | SgiStr of import_mode * string * int * sgn
+       | SgiSgn of string * int * sgn
+       | SgiConstraint of con * con
+       | SgiClassAbs of string * int * kind
+       | SgiClass of string * int * kind * con
+
+and sgn' =
+    SgnConst of sgn_item list
+  | SgnVar of int
+  | SgnFun of string * int * sgn * sgn
+  | SgnWhere of sgn * string list * string * con
+  | SgnProj of int * string list * string
+  | SgnError
+
+withtype sgn_item = sgn_item' located
+and sgn = sgn' located
+
+datatype decl' =
+         DCon of string * int * kind * con
+       | DDatatype of (string * int * string list * (string * int * con option) list) list
+       | DDatatypeImp of string * int * int * string list * string * string list * (string * int * con option) list
+       | DVal of string * int * con * exp
+       | DValRec of (string * int * con * exp) list
+       | DSgn of string * int * sgn
+       | DStr of string * int * sgn * str
+       | DFfiStr of string * int * sgn
+       | DConstraint of con * con
+       | DExport of int * sgn * str
+       | DTable of int * string * int * con * exp * con * exp * con
+       | DSequence of int * string * int
+       | DView of int * string * int * exp * con
+       | DDatabase of string
+       | DCookie of int * string * int * con
+       | DStyle of int * string * int
+       | DTask of exp * exp
+       | DPolicy of exp
+       | DOnError of int * string list * string
+       | DFfi of string * int * Source.ffi_mode list * con
+
+     and str' =
+         StrConst of decl list
+       | StrVar of int
+       | StrProj of str * string
+       | StrFun of string * int * sgn * sgn * str
+       | StrApp of str * str
+       | StrError
+
+withtype decl = decl' located
+     and str = str' located
+               
+type file = decl list
+
+end