(* This file contains tactics that are similar to ssreflect tactics. * The tactics here use numbers to refer to hypotheses to the right * of the entailment. *)
Section indexed.
Context {L : Type}
{ILO : ILogicOps L}
{IL : ILogic L}.

Theorem skip_top : forall A B C D : L,
(A //\\ B) //\\ C |-- D ->
A //\\ C |-- B -->> D.