--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/elab_err.sig	Sat Sep 13 10:30:45 2008 -0400
@@ -0,0 +1,113 @@
+(* 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 ELAB_ERR = sig
+
+    datatype kunify_error =
+             KOccursCheckFailed of Elab.kind * Elab.kind
+           | KIncompatible of Elab.kind * Elab.kind
+
+    val kunifyError : kunify_error -> unit
+
+    datatype con_error =
+             UnboundCon of ErrorMsg.span * string
+           | UnboundDatatype of ErrorMsg.span * string
+           | UnboundStrInCon of ErrorMsg.span * string
+           | WrongKind of Elab.con * Elab.kind * Elab.kind * kunify_error
+           | DuplicateField of ErrorMsg.span * string
+           | ProjBounds of Elab.con * int
+           | ProjMismatch of Elab.con * Elab.kind
+
+    val conError : ElabEnv.env -> con_error -> unit
+
+    datatype cunify_error =
+             CKind of Elab.kind * Elab.kind * kunify_error
+           | COccursCheckFailed of Elab.con * Elab.con
+           | CIncompatible of Elab.con * Elab.con
+           | CExplicitness of Elab.con * Elab.con
+           | CKindof of Elab.kind * Elab.con
+           | CRecordFailure of Elab.con * Elab.con
+
+    val cunifyError : ElabEnv.env -> cunify_error -> unit
+
+    datatype exp_error =
+             UnboundExp of ErrorMsg.span * string
+           | UnboundStrInExp of ErrorMsg.span * string
+           | Unify of Elab.exp * Elab.con * Elab.con * cunify_error
+           | Unif of string * Elab.con
+           | WrongForm of string * Elab.exp * Elab.con
+           | IncompatibleCons of Elab.con * Elab.con
+           | DuplicatePatternVariable of ErrorMsg.span * string
+           | PatUnify of Elab.pat * Elab.con * Elab.con * cunify_error
+           | UnboundConstructor of ErrorMsg.span * string list * string
+           | PatHasArg of ErrorMsg.span
+           | PatHasNoArg of ErrorMsg.span
+           | Inexhaustive of ErrorMsg.span
+           | DuplicatePatField of ErrorMsg.span * string
+           | Unresolvable of ErrorMsg.span * Elab.con
+           | OutOfContext of ErrorMsg.span * (Elab.exp * Elab.con) option
+           | IllegalRec of string * Elab.exp
+
+    val expError : ElabEnv.env -> exp_error -> unit
+
+    datatype decl_error =
+             KunifsRemain of Elab.decl list
+           | CunifsRemain of Elab.decl list
+           | Nonpositive of Elab.decl
+
+    val declError : ElabEnv.env -> decl_error -> unit
+
+    datatype sgn_error =
+             UnboundSgn of ErrorMsg.span * string
+           | UnmatchedSgi of Elab.sgn_item
+           | SgiWrongKind of Elab.sgn_item * Elab.kind * Elab.sgn_item * Elab.kind * kunify_error
+           | SgiWrongCon of Elab.sgn_item * Elab.con * Elab.sgn_item * Elab.con * cunify_error
+           | SgiMismatchedDatatypes of Elab.sgn_item * Elab.sgn_item * (Elab.con * Elab.con * cunify_error) option
+           | SgnWrongForm of Elab.sgn * Elab.sgn
+           | UnWhereable of Elab.sgn * string
+           | WhereWrongKind of Elab.kind * Elab.kind * kunify_error
+           | NotIncludable of Elab.sgn
+           | DuplicateCon of ErrorMsg.span * string
+           | DuplicateVal of ErrorMsg.span * string
+           | DuplicateSgn of ErrorMsg.span * string
+           | DuplicateStr of ErrorMsg.span * string
+           | NotConstraintsable of Elab.sgn
+
+    val sgnError : ElabEnv.env -> sgn_error -> unit
+
+    datatype str_error =
+             UnboundStr of ErrorMsg.span * string
+           | NotFunctor of Elab.sgn
+           | FunctorRebind of ErrorMsg.span
+           | UnOpenable of Elab.sgn
+           | NotType of Elab.kind * (Elab.kind * Elab.kind * kunify_error)
+           | DuplicateConstructor of string * ErrorMsg.span
+           | NotDatatype of ErrorMsg.span
+
+    val strError : ElabEnv.env -> str_error -> unit
+
+end