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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+Declare ML Module "ltac2_plugin".
+
+(** Primitive types *)
+
+Ltac2 Type int.
+Ltac2 Type string.
+Ltac2 Type char.
+Ltac2 Type ident.
+
+(** Constr-specific built-in types *)
+Ltac2 Type meta.
+Ltac2 Type evar.
+Ltac2 Type sort.
+Ltac2 Type cast.
+Ltac2 Type instance.
+Ltac2 Type constant.
+Ltac2 Type inductive.
+Ltac2 Type constructor.
+Ltac2 Type projection.
+Ltac2 Type pattern.
+Ltac2 Type constr.
+
+Ltac2 Type message.
+Ltac2 Type exn := [ .. ].
+Ltac2 Type 'a array.
+
+(** Pervasive types *)
+
+Ltac2 Type 'a option := [ None | Some ('a) ].
+
+Ltac2 Type 'a ref := { mutable contents : 'a }.
+
+Ltac2 Type bool := [ true | false ].
+
+Ltac2 Type 'a result := [ Val ('a) | Err (exn) ].
+
+(** Pervasive exceptions *)
+
+Ltac2 Type err.
+(** Coq internal errors. Cannot be constructed, merely passed around. *)
+
+Ltac2 Type exn ::= [ Internal (err) ].
+(** Wrapper around the errors raised by Coq implementation. *)
+
+Ltac2 Type exn ::= [ Out_of_bounds ].
+(** Used for bound checking, e.g. with String and Array. *)
+
+Ltac2 Type exn ::= [ Not_focussed ].
+(** In Ltac2, the notion of "current environment" only makes sense when there is
+    at most one goal under focus. Contrarily to Ltac1, instead of dynamically
+    focussing when we need it, we raise this non-backtracking error when it does
+    not make sense. *)
+
+Ltac2 Type exn ::= [ Not_found ].
+(** Used when something is missing. *)
+
+Ltac2 Type exn ::= [ Match_failure ].
+(** Used to signal a pattern didn't match a term. *)
+
+Ltac2 Type exn ::= [ Tactic_failure (message option) ].
+(** Generic error for tactic failure. *)