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+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.