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Require Program.Tactics.
Set Suggest Proof Using.
Set Warnings "-opaque-let".
Lemma nosec : nat. Proof. exact 0. Qed.
Lemma nosec_exactproof : bool. Proof false.
Program Definition nosec_program : nat := _.
Next Obligation. exact 1. Qed.
Lemma nosec_abstract : nat.
Proof. abstract exact 3. Defined.
Section Sec.
Variables A B : Type.
(* Some normal lemma. *)
Lemma Nat : Set.
Proof.
exact nat.
Qed.
(* Make sure All is suggested even though we add an unused variable
to the context. *)
Let foo : Type.
Proof.
exact (A -> B).
Qed.
(* Having a [Proof using] disables the suggestion message. *)
Definition bar : Type.
Proof using A.
exact A.
Qed.
(* Transparent definitions don't get a suggestion message. *)
Definition baz : Type.
Proof.
exact A.
Defined.
(* No suggest, is this OK? There's nowhere to put it anyway. *)
Program Definition program : nat := _.
Next Obligation. exact 1. Qed.
(* Must not suggest *)
Lemma sec_abstract : nat.
Proof. abstract exact 3. Defined.
(* Suggests even though there's nowhere to put it, bug? *)
Lemma sec_exactproof : bool. Proof true.
End Sec.
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