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(** Checks that Ltac's '+' tactical works as intended. *)
Goal forall (A B C D:Prop), (A->C) -> (B->C) -> (D->C) -> B -> C.
Proof.
intros A B C D h0 h1 h2 h3.
(* backtracking *)
(apply h0 + apply h1);apply h3.
Undo.
Fail ((apply h0+apply h2) || apply h1); apply h3.
(* interaction with || *)
((apply h0+apply h1) || apply h2); apply h3.
Qed.
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