Hint Extern 0 (RIntro _ (forall_pointwise_rel _) _ _) =>
eapply forall_pointwise_rintro : typeclass_instances.

Lemma forall_pointwise_relim {V FV1 FV2} R f g v P Q:
RElim (R v) (f v) (g v) P Q ->
RElim (@forall_pointwise_rel V FV1 FV2 R) f g P Q.