File: bug_1944.v

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(* Test some uses of ? in introduction patterns *)

Inductive J : nat -> Prop :=
  | K : forall p, J p -> (True /\ True)  -> J (S p).

Lemma bug : forall n, J n -> J (S n).
Proof.
  intros ? H.
  induction H as [? ? [? ?]].
Abort.