f_equal, revert, specialize in ML, contradict in better Ltac (+doc)

 * "f_equal" is now a tactic in ML (placed alongside congruence since
   it uses it). Normally, it should be completely compatible with the
   former Ltac version, except that it doesn't suffer anymore from the
   "up to 5 args" earlier limitation.

 * "revert" also becomes an ML tactic. This doesn't bring any real 
   improvement, just some more uniformity with clear and generalize.  

 * The experimental "narrow" tactic is removed from Tactics.v, and 
   replaced by an evolution of the old & undocumented "specialize" 
   ML tactic: 
   - when specialize is called on an hyp H, the specialization is 
     now done in place on H. For instance "specialize (H t u v)"
     removes the three leading forall of H and intantiates them by 
     t u and v.
   - otherwise specialize still works as before (i.e. as a kind of 
     generalize).
   See the RefMan and test-suite/accept/specialize.v for more infos. 
   Btw, specialize can still accept an optional number for specifying 
   how many premises to instantiate. This number should normally 
   be useless now (some autodetection mecanism added). Hence this 
   feature is left undocumented. For the happy few still using 
   specialize in the old manner, beware of the slight incompatibities...

 * finally, "contradict" is left as Ltac in Tactics.v, but it has 
   now a better shape (accepts unfolded nots and/or things in Type), 
   and also some documentation in the RefMan



git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@10637 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 3 insertions, 3 deletions

diff --git a/theories/Sets/Integers.v b/theories/Sets/Integers.v
index 88cdabe3f..ec44a6e58 100644
--- a/theories/Sets/Integers.v
+++ b/theories/Sets/Integers.v
@@ -87,7 +87,7 @@ Section Integers_sect.
     apply Totally_ordered_definition.
     simpl in |- *.
     intros H' x y H'0.
-    specialize  2le_or_lt with (n := x) (m := y); intro H'2; elim H'2.
+    elim le_or_lt with (n := x) (m := y).
     intro H'1; left; auto with sets arith.
     intro H'1; right.
     cut (y <= x); auto with sets arith.
@@ -142,8 +142,8 @@ Section Integers_sect.
     elim H'0; intros H'1 H'2.
     cut (In nat Integers (S x)).
     intro H'3.
-    specialize  1H'2 with (y := S x); intro H'4; lapply H'4;
-      [ intro H'5; clear H'4 | try assumption; clear H'4 ].
+    specialize H'2 with (y := S x); lapply H'2;
+      [ intro H'5; clear H'2 | try assumption; clear H'2 ].
     simpl in H'5.
     absurd (S x <= x); auto with arith.
     apply triv_nat.