File: bug_7982.v

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coq 8.20.1%2Bdfsg-1
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Set Primitive Projections.

CoInductive stream (A : Type) := cons { hd : A; tl : stream A }.

CoFixpoint const {A} (x : A) := cons A x (const x).

Goal forall A x, (@const A x).(tl _) = const x.
Proof.
intros.
simpl.
match goal with [ |- ?x = ?x ] => idtac end.
Abort.