[lib] Split auxiliary libraries into Coq-specific and general.

Up to this point the `lib` directory contained two different library
archives, `clib.cma` and `lib.cma`, which a rough splitting between
Coq-specific libraries and general-purpose ones.

We know split the directory in two, as to make the distinction clear:

- `clib`: contains libraries that are not Coq specific and implement
  common data structures and programming patterns. These libraries
  could be eventually replace with external dependencies and the rest
  of the code base wouldn't notice much.

- `lib`: contains Coq-specific common libraries in widespread use
  along the codebase, but that are not considered part of other
  components. Examples are printing, error handling, or flags.

In some cases we have coupling due to utility files depending on Coq
specific flags, however this commit doesn't modify any files, but only
moves them around, further cleanup is welcome, as indeed a few files
in `lib` should likely be placed in `clib`.

Also note that `Deque` is not used ATM.

1 files changed, 39 insertions, 0 deletions

diff --git a/clib/exninfo.mli b/clib/exninfo.mli
new file mode 100644
index 000000000..c960ac7c0
--- /dev/null
+++ b/clib/exninfo.mli
@@ -0,0 +1,39 @@
+(***********************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team    *)
+(* <O___,, *        INRIA-Rocquencourt  &  LRI-CNRS-Orsay              *)
+(*   \VV/  *************************************************************)
+(*    //   *      This file is distributed under the terms of the      *)
+(*         *       GNU Lesser General Public License Version 2.1       *)
+(***********************************************************************)
+
+(** Additional information worn by exceptions. *)
+
+type 'a t
+(** Information containing a given type. *)
+
+type info
+(** All information *)
+
+type iexn = exn * info
+(** Information-wearing exceptions *)
+
+val make : unit -> 'a t
+(** Create a new piece of information. *)
+
+val null : info
+(** No information *)
+
+val add : info -> 'a t -> 'a -> info
+(** Add information to an exception. *)
+
+val get : info -> 'a t -> 'a option
+(** Get information worn by an exception. Returns [None] if undefined. *)
+
+val info : exn -> info
+(** Retrieve the information of the last exception raised. *)
+
+val iraise : iexn -> 'a
+(** Raise the given enriched exception. *)
+
+val raise : ?info:info -> exn -> 'a
+(** Raise the given exception with additional information. *)