(* 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}.

Lemma apply_ctx' : forall A B C D : L,
C //\\ B |-- D ->
C |-- A ->
C //\\ (A -->> B) |-- D.