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Set Primitive Projections.
CoInductive stream A := { hd : A; tl : stream A }.
CoFixpoint ticks (n : nat) : stream unit := {| hd := tt; tl := ticks n |}.
Lemma expand : exists n : nat, (ticks n) = (ticks n).(tl _).
Proof.
eexists.
(* Set Debug Tactic Unification. *)
(* Set Debug RAKAM. *)
reflexivity.
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