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(* This used to raise an anomaly in 8.8 *)
Inductive T := Tau (t : T).
Notation idT t := (match t with Tau t => Tau t end).
Lemma match_itree : forall (t : T), t = idT t.
Proof. destruct t; auto. Qed.
Lemma what (k : unit -> T) : k tt = k tt.
Proof. rewrite match_itree. Abort.
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