Hint Rewrite @lift0_exp : norm2.
Hint Rewrite @lift0C_exp : norm2.

Lemma lift0C_sepcon {A}{NA: NatDed A}{SA: SepLog A}:
forall P Q N2 S2,
(@liftx (LiftEnviron A) (@sepcon A N2 S2 P Q)) =
(@sepcon (environ->A) _ _
(@liftx (LiftEnviron A) P)
(@liftx (LiftEnviron A) Q)).