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Definition classical_logic : Prop := forall(P : Prop), ~~P -> P.
(* automatic test marker 1 *)
Lemma classic_excluded_middle :
(forall(P : Prop), P \/ ~ P) -> classical_logic.
Proof.
intros H P H0.
(* automatic test marker 2 *)
specialize (H P).
Abort.
Lemma classic_excluded_middle :
(forall(P : Prop), P \/ ~ P) -> classical_logic.
Proof using.
intros H P H0.
specialize (H P).
(* automatic test marker 3 *)
destruct H.
trivial.
contradiction.
Qed.
(* automatic test marker 4 *)
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