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Set Primitive Projections.
Set Implicit Arguments.
CoInductive stream A := cons { hd : A; tl : stream A }.
CoFixpoint id {A} (s : stream A) := cons (hd s) (id (tl s)).
Lemma id_spec : forall A (s : stream A), id s = s.
Proof.
intros A s.
Fail change (id s) with (cons (hd (id s)) (tl (id s))).
Abort.
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