File: bug_3625.v

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coq 8.20.1%2Bdfsg-1
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Require Import TestSuite.admit.
Set Implicit Arguments.
Set Primitive Projections.
Record prod A B := pair { fst : A ; snd : B }.

Goal forall x y : prod Set Set, x.(@fst _ _) = y.(@fst _ _).
 intros.
 refine (f_equal _ _).
 Undo.
 apply f_equal.
 admit.
Qed.