Hint Rewrite globvars2pred_unfold : norm.
Hint Rewrite @exp_trivial : norm.

Lemma derives_full_bupd0_left: forall Delta P Q,
local (tc_environ Delta) && (allp_fun_id Delta && P) |-- |==> |> FF || Q ->
local (tc_environ Delta) && (allp_fun_id Delta && |==> |> FF || P) |-- |==> |> FF || Q.