Integrate build and documentation of Ltac2

Since Ltac2 cannot be put under the stdlib logical root (some file names
would clash), we move it to the `user-contrib` directory, to avoid adding
another hardcoded path in `coqinit.ml`, following a suggestion by @ejgallego.

Thanks to @Zimmi48 for the thorough documentation review and the
numerous suggestions.

1 files changed, 34 insertions, 0 deletions

diff --git a/user-contrib/Ltac2/tac2dyn.mli b/user-contrib/Ltac2/tac2dyn.mli
new file mode 100644
index 0000000000..e995296840
--- /dev/null
+++ b/user-contrib/Ltac2/tac2dyn.mli
@@ -0,0 +1,34 @@
+(************************************************************************)
+(*  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        *)
+(************************************************************************)
+
+(** Dynamic arguments for Ltac2. *)
+
+module Arg :
+sig
+  type ('a, 'b) tag
+  val create : string -> ('a, 'b) tag
+  val eq : ('a1, 'b1) tag -> ('a2, 'b2) tag -> ('a1 * 'b1, 'a2 * 'b2) CSig.eq option
+  val repr : ('a, 'b) tag -> string
+end
+(** Arguments that are part of an AST. *)
+
+module type Param = sig type ('raw, 'glb) t end
+
+module ArgMap (M : Param) :
+sig
+  type _ pack = Pack : ('raw, 'glb) M.t -> ('raw * 'glb) pack
+  type t
+  val empty : t
+  val add : ('a, 'b) Arg.tag -> ('a * 'b) pack -> t -> t
+  val remove : ('a, 'b) Arg.tag -> t -> t
+  val find : ('a, 'b) Arg.tag -> t -> ('a * 'b) pack
+  val mem : ('a, 'b) Arg.tag -> t -> bool
+end
+
+module Val : Dyn.S
+(** Toplevel values *)