Back-porting from new Matita:

- GREAT: when unifying ?1 : Type[i]  with ?2: Type[j] the unifier
  randomly tried to instantiate ?1 with ?2 even when j > i, yielding to
  an unification error later on. In turn, this created that horrible
  behaviour of rewriting that failed if you did not pass enough types
  to the lemma.
- in rewriting the argument is now automatically saturated

These two fixes together allow most of the time to write simply >f as we
did in the old system.

diff --git a/helm/software/components/ng_tactics/nTactics.ml b/helm/software/components/ng_tactics/nTactics.ml
index 895eec2d2ae917fba76374a9f82b3d1f6effbb87..86b42f66190403dc2630ec8ebe941cb66db75dec 100644 (file)
--- a/helm/software/components/ng_tactics/nTactics.ml
+++ b/helm/software/components/ng_tactics/nTactics.ml
@@ -542,6 +542,7 @@ let rewrite_tac ~dir ~what:(_,_,what) ~where status =
      `LeftToRight -> "eq" ^ suffix ^ "_r"
    | `RightToLeft -> "eq" ^ suffix
  in
+ let what = Ast.Appl [what; Ast.Implicit `Vector] in
   block_tac
    [ select_tac ~where ~job:(`Substexpand 2) true;
      exact_tac