Declare Implicit Tactic

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@7366 85f007b7-540e-0410-9357-904b9bb8a0f7

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+(* A Wiedijk-Cruz-Filipe style tactic for solving implicit arguments *)
+
+(* Declare a term expression with a hole *)
+Parameter quo : nat -> forall n:nat, n<>0 -> nat.
+Notation "x / y" := (quo x y _) : nat_scope.
+
+(* Declare the tactic for resolving implicit arguments still
+   unresolved after type-checking; it must complete the subgoal to
+   succeed *)
+Declare Implicit Tactic assumption.
+
+Goal forall n d, d<>0 -> { q:nat & { r:nat | d * q + r = n }}.
+intros.
+(* Here, assumption is used to solve the implicit argument of quo *)
+exists (n / d).