Commit c9760db3 authored by Robbert Krebbers's avatar Robbert Krebbers

Comment about BiFUpdPlainly and affine BIs.

parent f716d0dc
......@@ -79,6 +79,10 @@ Class BiBUpdPlainly (PROP : sbi) `{!BiBUpd PROP, !BiPlainly PROP} :=
bupd_plainly (P : PROP) : (|==> P) - P.
Hint Mode BiBUpdPlainly ! - - : typeclass_instances.
(** These rules for the interaction between the [■] and [|={E1,E2=>] modalities
only make sense for affine logics. From the axioms below, one could derive
[■ P ={E}=∗ P] (see the lemma [fupd_plainly_elim]), which in turn gives
[True ={E}=∗ emp]. *)
Class BiFUpdPlainly (PROP : sbi) `{!BiFUpd PROP, !BiPlainly PROP} := {
fupd_plainly_mask_empty E (P : PROP) :
(|={E,}=> P) |={E}=> P;
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