Integrate a few improvements on typeclasses and Program from the equations branch

and remove equations stuff which moves to a separate plugin.

Classes:
- Ability to define classes post-hoc from constants or inductive types.
- Correctly rebuild the hint database associated to local hypotheses when 
  they are changed by a [Hint Extern] in typeclass resolution.

Tactics and proofs:
- Change [revert] so that it keeps let-ins (but not [generalize]).
- Various improvements to the [generalize_eqs] tactic to make it more robust
  and produce the smallest proof terms possible.
  Move [specialize_hypothesis] in tactics.ml as it goes hand in hand with 
  [generalize_eqs].
- A few new general purpose tactics in Program.Tactics like [revert_until]
- Make transitive closure well-foundedness proofs transparent.
- More uniform testing for metas/evars in pretyping/unification.ml
  (might introduce a few changes in the contribs).

Program:
- Better sorting of dependencies in obligations.
- Ability to start a Program definition from just a type and no obligations, 
  automatically adding an obligation for this type.
- In compilation of Program's well-founded definitions, make the functional a
  separate definition for easier reasoning.
- Add a hint database for every Program populated by [Hint Unfold]s for 
  every defined obligation constant.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12440 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 9 insertions, 7 deletions

diff --git a/plugins/subtac/eterm.mli b/plugins/subtac/eterm.mli
index 1d1c51266..f45dfa1cc 100644
--- a/plugins/subtac/eterm.mli
+++ b/plugins/subtac/eterm.mli
@@ -22,11 +22,13 @@ val sort_dependencies : (int * evar_info * Intset.t) list -> (int * evar_info *
 
 (* env, id, evars, number of function prototypes to try to clear from
    evars contexts, object and type *)
-val eterm_obligations : env -> identifier -> evar_defs -> evar_map -> int ->
-  ?status:obligation_definition_status -> constr -> types ->
-  (identifier * types * loc * obligation_definition_status * Intset.t *
-      Tacexpr.raw_tactic_expr option) array * constr * types
-    (* Obl. name, type as product, location of the original evar, associated tactic,
+val eterm_obligations : env -> identifier -> evar_defs -> evar_map -> int -> 
+  ?status:obligation_definition_status -> constr -> types -> 
+  (identifier * types * loc * obligation_definition_status * Intset.t * 
+      tactic option) array
+    (* Existential key, obl. name, type as product, location of the original evar, associated tactic,
        status and dependencies as indexes into the array *)
-
-val etermtac : open_constr -> tactic
+  * ((existential_key * identifier) list * ((identifier -> constr) -> constr -> constr)) * constr * types
+    (* Translations from existential identifiers to obligation identifiers 
+       and for terms with existentials to closed terms, given a 
+       translation from obligation identifiers to constrs, new term, new type *)