Merge branch 'master' of https://gitlab.mpi-sws.org/FP/iris-coq

_CoqProject

@@ -14,7 +14,7 @@ theories/algebra/dra.v
 theories/algebra/cofe_solver.v
 theories/algebra/agree.v
 theories/algebra/excl.v
-theories/algebra/iprod.v
+theories/algebra/functions.v
 theories/algebra/frac.v
 theories/algebra/csum.v
 theories/algebra/list.v

theories/algebra/cmra.v

 From iris.algebra Require Export ofe monoid.
+From stdpp Require Import finite.
 Set Default Proof Using "Type".
 
 Class PCore (A : Type) := pcore : A → option A.
@@ -1462,3 +1463,103 @@ Instance optionURF_contractive F :
 Proof.
   by intros ? A1 A2 B1 B2 n f g Hfg; apply optionC_map_ne, rFunctor_contractive.
 Qed.
+
+(* Dependently-typed functions over a finite domain *)
+Section ofe_fun_cmra.
+  Context `{Hfin : Finite A} {B : A → ucmraT}.
+  Implicit Types f g : ofe_fun B.
+
+  Instance ofe_fun_op : Op (ofe_fun B) := λ f g x, f x ⋅ g x.
+  Instance ofe_fun_pcore : PCore (ofe_fun B) := λ f, Some (λ x, core (f x)).
+  Instance ofe_fun_valid : Valid (ofe_fun B) := λ f, ∀ x, ✓ f x.
+  Instance ofe_fun_validN : ValidN (ofe_fun B) := λ n f, ∀ x, ✓{n} f x.
+
+  Definition ofe_fun_lookup_op f g x : (f ⋅ g) x = f x ⋅ g x := eq_refl.
+  Definition ofe_fun_lookup_core f x : (core f) x = core (f x) := eq_refl.
+
+  Lemma ofe_fun_included_spec (f g : ofe_fun B) : f ≼ g ↔ ∀ x, f x ≼ g x.
+  Proof using Hfin.
+    split; [by intros [h Hh] x; exists (h x); rewrite /op /ofe_fun_op (Hh x)|].
+    intros [h ?]%finite_choice. by exists h.
+  Qed.
+
+  Lemma ofe_fun_cmra_mixin : CmraMixin (ofe_fun B).
+  Proof using Hfin.
+    apply cmra_total_mixin.
+    - eauto.
+    - by intros n f1 f2 f3 Hf x; rewrite ofe_fun_lookup_op (Hf x).
+    - by intros n f1 f2 Hf x; rewrite ofe_fun_lookup_core (Hf x).
+    - by intros n f1 f2 Hf ? x; rewrite -(Hf x).
+    - intros g; split.
+      + intros Hg n i; apply cmra_valid_validN, Hg.
+      + intros Hg i; apply cmra_valid_validN=> n; apply Hg.
+    - intros n f Hf x; apply cmra_validN_S, Hf.
+    - by intros f1 f2 f3 x; rewrite ofe_fun_lookup_op assoc.
+    - by intros f1 f2 x; rewrite ofe_fun_lookup_op comm.
+    - by intros f x; rewrite ofe_fun_lookup_op ofe_fun_lookup_core cmra_core_l.
+    - by intros f x; rewrite ofe_fun_lookup_core cmra_core_idemp.
+    - intros f1 f2; rewrite !ofe_fun_included_spec=> Hf x.
+      by rewrite ofe_fun_lookup_core; apply cmra_core_mono, Hf.
+    - intros n f1 f2 Hf x; apply cmra_validN_op_l with (f2 x), Hf.
+    - intros n f f1 f2 Hf Hf12.
+      destruct (finite_choice (λ x (yy : B x * B x),
+        f x ≡ yy.1 ⋅ yy.2 ∧ yy.1 ≡{n}≡ f1 x ∧ yy.2 ≡{n}≡ f2 x)) as [gg Hgg].
+      { intros x. specialize (Hf12 x).
+        destruct (cmra_extend n (f x) (f1 x) (f2 x)) as (y1&y2&?&?&?); eauto.
+        exists (y1,y2); eauto. }
+      exists (λ x, gg x.1), (λ x, gg x.2). split_and!=> -?; naive_solver.
+  Qed.
+  Canonical Structure ofe_funR := CmraT (ofe_fun B) ofe_fun_cmra_mixin.
+
+  Instance ofe_fun_unit : Unit (ofe_fun B) := λ x, ε.
+  Definition ofe_fun_lookup_empty x : ε x = ε := eq_refl.
+
+  Lemma ofe_fun_ucmra_mixin : UcmraMixin (ofe_fun B).
+  Proof.
+    split.
+    - intros x; apply ucmra_unit_valid.
+    - by intros f x; rewrite ofe_fun_lookup_op left_id.
+    - constructor=> x. apply core_id_core, _.
+  Qed.
+  Canonical Structure ofe_funUR := UcmraT (ofe_fun B) ofe_fun_ucmra_mixin.
+
+  Global Instance ofe_fun_unit_discrete :
+    (∀ i, Discrete (ε : B i)) → Discrete (ε : ofe_fun B).
+  Proof. intros ? f Hf x. by apply: discrete. Qed.
+End ofe_fun_cmra.
+
+Arguments ofe_funR {_ _ _} _.
+Arguments ofe_funUR {_ _ _} _.
+
+Instance ofe_fun_map_cmra_morphism
+    `{Finite A} {B1 B2 : A → ucmraT} (f : ∀ x, B1 x → B2 x) :
+  (∀ x, CmraMorphism (f x)) → CmraMorphism (ofe_fun_map f).
+Proof.
+  split; first apply _.
+  - intros n g Hg x; rewrite /ofe_fun_map; apply (cmra_morphism_validN (f _)), Hg.
+  - intros. apply Some_proper=>i. apply (cmra_morphism_core (f i)).
+  - intros g1 g2 i. by rewrite /ofe_fun_map ofe_fun_lookup_op cmra_morphism_op.
+Qed.
+
+Program Definition ofe_funURF `{Finite C} (F : C → urFunctor) : urFunctor := {|
+  urFunctor_car A B := ofe_funUR (λ c, urFunctor_car (F c) A B);
+  urFunctor_map A1 A2 B1 B2 fg := ofe_funC_map (λ c, urFunctor_map (F c) fg)
+|}.
+Next Obligation.
+  intros C ?? F A1 A2 B1 B2 n ?? g.
+  by apply ofe_funC_map_ne=>?; apply urFunctor_ne.
+Qed.
+Next Obligation.
+  intros C ?? F A B g; simpl. rewrite -{2}(ofe_fun_map_id g).
+  apply ofe_fun_map_ext=> y; apply urFunctor_id.
+Qed.
+Next Obligation.
+  intros C ?? F A1 A2 A3 B1 B2 B3 f1 f2 f1' f2' g. rewrite /=-ofe_fun_map_compose.
+  apply ofe_fun_map_ext=>y; apply urFunctor_compose.
+Qed.
+Instance ofe_funURF_contractive `{Finite C} (F : C → urFunctor) :
+  (∀ c, urFunctorContractive (F c)) → urFunctorContractive (ofe_funURF F).
+Proof.
+  intros ? A1 A2 B1 B2 n ?? g.
+  by apply ofe_funC_map_ne=>c; apply urFunctor_contractive.
+Qed.

theories/algebra/functions.v

+From iris.algebra Require Export cmra.
+From iris.algebra Require Import updates.
+From stdpp Require Import finite.
+Set Default Proof Using "Type".
+
+Definition ofe_fun_insert `{EqDecision A} {B : A → ofeT}
+    (x : A) (y : B x) (f : ofe_fun B) : ofe_fun B := λ x',
+  match decide (x = x') with left H => eq_rect _ B y _ H | right _ => f x' end.
+Instance: Params (@ofe_fun_insert) 5.
+
+Definition ofe_fun_singleton `{Finite A} {B : A → ucmraT} 
+  (x : A) (y : B x) : ofe_fun B := ofe_fun_insert x y ε.
+Instance: Params (@ofe_fun_singleton) 5.
+
+Section ofe.
+  Context `{Heqdec : EqDecision A} {B : A → ofeT}.
+  Implicit Types x : A.
+  Implicit Types f g : ofe_fun B.
+
+  (** Properties of ofe_fun_insert. *)
+  Global Instance ofe_fun_insert_ne x :
+    NonExpansive2 (ofe_fun_insert (B:=B) x).
+  Proof.
+    intros n y1 y2 ? f1 f2 ? x'; rewrite /ofe_fun_insert.
+    by destruct (decide _) as [[]|].
+  Qed.
+  Global Instance ofe_fun_insert_proper x :
+    Proper ((≡) ==> (≡) ==> (≡)) (ofe_fun_insert x) := ne_proper_2 _.
+
+  Lemma ofe_fun_lookup_insert f x y : (ofe_fun_insert x y f) x = y.
+  Proof.
+    rewrite /ofe_fun_insert; destruct (decide _) as [Hx|]; last done.
+    by rewrite (proof_irrel Hx eq_refl).
+  Qed.
+  Lemma ofe_fun_lookup_insert_ne f x x' y :
+    x ≠ x' → (ofe_fun_insert x y f) x' = f x'.
+  Proof. by rewrite /ofe_fun_insert; destruct (decide _). Qed.
+
+  Global Instance ofe_fun_insert_discrete f x y :
+    Discrete f → Discrete y → Discrete (ofe_fun_insert x y f).
+  Proof.
+    intros ?? g Heq x'; destruct (decide (x = x')) as [->|].
+    - rewrite ofe_fun_lookup_insert.
+      apply: discrete. by rewrite -(Heq x') ofe_fun_lookup_insert.
+    - rewrite ofe_fun_lookup_insert_ne //.
+      apply: discrete. by rewrite -(Heq x') ofe_fun_lookup_insert_ne.
+  Qed.
+End ofe.
+
+Section cmra.
+  Context `{Finite A} {B : A → ucmraT}.
+  Implicit Types x : A.
+  Implicit Types f g : ofe_fun B.
+
+  Global Instance ofe_fun_singleton_ne x :
+    NonExpansive (ofe_fun_singleton x : B x → _).
+  Proof. intros n y1 y2 ?; apply ofe_fun_insert_ne. done. by apply equiv_dist. Qed.
+  Global Instance ofe_fun_singleton_proper x :
+    Proper ((≡) ==> (≡)) (ofe_fun_singleton x) := ne_proper _.
+
+  Lemma ofe_fun_lookup_singleton x (y : B x) : (ofe_fun_singleton x y) x = y.
+  Proof. by rewrite /ofe_fun_singleton ofe_fun_lookup_insert. Qed.
+  Lemma ofe_fun_lookup_singleton_ne x x' (y : B x) :
+    x ≠ x' → (ofe_fun_singleton x y) x' = ε.
+  Proof. intros; by rewrite /ofe_fun_singleton ofe_fun_lookup_insert_ne. Qed.
+
+  Global Instance ofe_fun_singleton_discrete x (y : B x) :
+    (∀ i, Discrete (ε : B i)) →  Discrete y → Discrete (ofe_fun_singleton x y).
+  Proof. apply _. Qed.
+
+  Lemma ofe_fun_singleton_validN n x (y : B x) : ✓{n} ofe_fun_singleton x y ↔ ✓{n} y.
+  Proof.
+    split; [by move=>/(_ x); rewrite ofe_fun_lookup_singleton|].
+    move=>Hx x'; destruct (decide (x = x')) as [->|];
+      rewrite ?ofe_fun_lookup_singleton ?ofe_fun_lookup_singleton_ne //.
+    by apply ucmra_unit_validN.
+  Qed.
+
+  Lemma ofe_fun_core_singleton x (y : B x) :
+    core (ofe_fun_singleton x y) ≡ ofe_fun_singleton x (core y).
+  Proof.
+    move=>x'; destruct (decide (x = x')) as [->|];
+      by rewrite ofe_fun_lookup_core ?ofe_fun_lookup_singleton
+      ?ofe_fun_lookup_singleton_ne // (core_id_core ∅).
+  Qed.
+
+  Global Instance ofe_fun_singleton_core_id x (y : B x) :
+    CoreId y → CoreId (ofe_fun_singleton x y).
+  Proof. by rewrite !core_id_total ofe_fun_core_singleton=> ->. Qed.
+
+  Lemma ofe_fun_op_singleton (x : A) (y1 y2 : B x) :
+    ofe_fun_singleton x y1 ⋅ ofe_fun_singleton x y2 ≡ ofe_fun_singleton x (y1 ⋅ y2).
+  Proof.
+    intros x'; destruct (decide (x' = x)) as [->|].
+    - by rewrite ofe_fun_lookup_op !ofe_fun_lookup_singleton.
+    - by rewrite ofe_fun_lookup_op !ofe_fun_lookup_singleton_ne // left_id.
+  Qed.
+
+  Lemma ofe_fun_insert_updateP x (P : B x → Prop) (Q : ofe_fun B → Prop) g y1 :
+    y1 ~~>: P → (∀ y2, P y2 → Q (ofe_fun_insert x y2 g)) →
+    ofe_fun_insert x y1 g ~~>: Q.
+  Proof.
+    intros Hy1 HP; apply cmra_total_updateP.
+    intros n gf Hg. destruct (Hy1 n (Some (gf x))) as (y2&?&?).
+    { move: (Hg x). by rewrite ofe_fun_lookup_op ofe_fun_lookup_insert. }
+    exists (ofe_fun_insert x y2 g); split; [auto|].
+    intros x'; destruct (decide (x' = x)) as [->|];
+      rewrite ofe_fun_lookup_op ?ofe_fun_lookup_insert //; [].
+    move: (Hg x'). by rewrite ofe_fun_lookup_op !ofe_fun_lookup_insert_ne.
+  Qed.
+
+  Lemma ofe_fun_insert_updateP' x (P : B x → Prop) g y1 :
+    y1 ~~>: P →
+    ofe_fun_insert x y1 g ~~>: λ g', ∃ y2, g' = ofe_fun_insert x y2 g ∧ P y2.
+  Proof. eauto using ofe_fun_insert_updateP. Qed.
+  Lemma ofe_fun_insert_update g x y1 y2 :
+    y1 ~~> y2 → ofe_fun_insert x y1 g ~~> ofe_fun_insert x y2 g.
+  Proof.
+    rewrite !cmra_update_updateP; eauto using ofe_fun_insert_updateP with subst.
+  Qed.
+
+  Lemma ofe_fun_singleton_updateP x (P : B x → Prop) (Q : ofe_fun B → Prop) y1 :
+    y1 ~~>: P → (∀ y2, P y2 → Q (ofe_fun_singleton x y2)) →
+    ofe_fun_singleton x y1 ~~>: Q.
+  Proof. rewrite /ofe_fun_singleton; eauto using ofe_fun_insert_updateP. Qed.
+  Lemma ofe_fun_singleton_updateP' x (P : B x → Prop) y1 :
+    y1 ~~>: P →
+    ofe_fun_singleton x y1 ~~>: λ g, ∃ y2, g = ofe_fun_singleton x y2 ∧ P y2.
+  Proof. eauto using ofe_fun_singleton_updateP. Qed.
+  Lemma ofe_fun_singleton_update x (y1 y2 : B x) :
+    y1 ~~> y2 → ofe_fun_singleton x y1 ~~> ofe_fun_singleton x y2.
+  Proof. eauto using ofe_fun_insert_update. Qed.
+
+  Lemma ofe_fun_singleton_updateP_empty x (P : B x → Prop) (Q : ofe_fun B → Prop) :
+    ε ~~>: P → (∀ y2, P y2 → Q (ofe_fun_singleton x y2)) → ε ~~>: Q.
+  Proof.
+    intros Hx HQ; apply cmra_total_updateP.
+    intros n gf Hg. destruct (Hx n (Some (gf x))) as (y2&?&?); first apply Hg.
+    exists (ofe_fun_singleton x y2); split; [by apply HQ|].
+    intros x'; destruct (decide (x' = x)) as [->|].
+    - by rewrite ofe_fun_lookup_op ofe_fun_lookup_singleton.
+    - rewrite ofe_fun_lookup_op ofe_fun_lookup_singleton_ne //. apply Hg.
+  Qed.
+  Lemma ofe_fun_singleton_updateP_empty' x (P : B x → Prop) :
+    ε ~~>: P → ε ~~>: λ g, ∃ y2, g = ofe_fun_singleton x y2 ∧ P y2.
+  Proof. eauto using ofe_fun_singleton_updateP_empty. Qed.
+  Lemma ofe_fun_singleton_update_empty x (y : B x) :
+    ε ~~> y → ε ~~> ofe_fun_singleton x y.
+  Proof.
+    rewrite !cmra_update_updateP;
+      eauto using ofe_fun_singleton_updateP_empty with subst.
+  Qed.
+End cmra.

theories/algebra/iprod.v

-From iris.algebra Require Export cmra.
-From iris.base_logic Require Import base_logic.
-From stdpp Require Import finite.
-Set Default Proof Using "Type".
-
-(** * Indexed product *)
-(** Need to put this in a definition to make canonical structures to work. *)
-Definition iprod `{Finite A} (B : A → ofeT) := ∀ x, B x.
-Definition iprod_insert `{Finite A} {B : A → ofeT}
-    (x : A) (y : B x) (f : iprod B) : iprod B := λ x',
-  match decide (x = x') with left H => eq_rect _ B y _ H | right _ => f x' end.
-Instance: Params (@iprod_insert) 5.
-
-Section iprod_cofe.
-  Context `{Finite A} {B : A → ofeT}.
-  Implicit Types x : A.
-  Implicit Types f g : iprod B.
-
-  Instance iprod_equiv : Equiv (iprod B) := λ f g, ∀ x, f x ≡ g x.
-  Instance iprod_dist : Dist (iprod B) := λ n f g, ∀ x, f x ≡{n}≡ g x.
-  Definition iprod_ofe_mixin : OfeMixin (iprod B).
-  Proof.
-    split.
-    - intros f g; split; [intros Hfg n k; apply equiv_dist, Hfg|].
-      intros Hfg k; apply equiv_dist; intros n; apply Hfg.
-    - intros n; split.
-      + by intros f x.
-      + by intros f g ? x.
-      + by intros f g h ?? x; trans (g x).
-    - intros n f g Hfg x; apply dist_S, Hfg.
-  Qed.
-  Canonical Structure iprodC : ofeT := OfeT (iprod B) iprod_ofe_mixin.
-
-  Program Definition iprod_chain (c : chain iprodC) (x : A) : chain (B x) :=
-    {| chain_car n := c n x |}.
-  Next Obligation. by intros c x n i ?; apply (chain_cauchy c). Qed.
-  Global Program Instance iprod_cofe `{∀ a, Cofe (B a)} : Cofe iprodC :=
-    {| compl c x := compl (iprod_chain c x) |}.
-  Next Obligation.
-    intros ? n c x.
-    rewrite (conv_compl n (iprod_chain c x)).
-    apply (chain_cauchy c); lia.
-  Qed.
-
-  (** Properties of iprod_insert. *)
-  Global Instance iprod_insert_ne x :
-    NonExpansive2 (iprod_insert x).
-  Proof.
-    intros n y1 y2 ? f1 f2 ? x'; rewrite /iprod_insert.
-    by destruct (decide _) as [[]|].
-  Qed.
-  Global Instance iprod_insert_proper x :
-    Proper ((≡) ==> (≡) ==> (≡)) (iprod_insert x) := ne_proper_2 _.
-
-  Lemma iprod_lookup_insert f x y : (iprod_insert x y f) x = y.
-  Proof.
-    rewrite /iprod_insert; destruct (decide _) as [Hx|]; last done.
-    by rewrite (proof_irrel Hx eq_refl).
-  Qed.
-  Lemma iprod_lookup_insert_ne f x x' y :
-    x ≠ x' → (iprod_insert x y f) x' = f x'.
-  Proof. by rewrite /iprod_insert; destruct (decide _). Qed.
-
-  Global Instance iprod_lookup_discrete f x : Discrete f → Discrete (f x).
-  Proof.
-    intros ? y ?.
-    cut (f ≡ iprod_insert x y f).
-    { by move=> /(_ x)->; rewrite iprod_lookup_insert. }
-    apply (discrete _)=> x'; destruct (decide (x = x')) as [->|];
-      by rewrite ?iprod_lookup_insert ?iprod_lookup_insert_ne.
-  Qed.
-  Global Instance iprod_insert_discrete f x y :
-    Discrete f → Discrete y → Discrete (iprod_insert x y f).
-  Proof.
-    intros ?? g Heq x'; destruct (decide (x = x')) as [->|].
-    - rewrite iprod_lookup_insert.
-      apply: discrete. by rewrite -(Heq x') iprod_lookup_insert.
-    - rewrite iprod_lookup_insert_ne //.
-      apply: discrete. by rewrite -(Heq x') iprod_lookup_insert_ne.
-  Qed.
-End iprod_cofe.
-
-Arguments iprodC {_ _ _} _.
-
-Section iprod_cmra.
-  Context `{Finite A} {B : A → ucmraT}.
-  Implicit Types f g : iprod B.
-
-  Instance iprod_op : Op (iprod B) := λ f g x, f x ⋅ g x.
-  Instance iprod_pcore : PCore (iprod B) := λ f, Some (λ x, core (f x)).
-  Instance iprod_valid : Valid (iprod B) := λ f, ∀ x, ✓ f x.
-  Instance iprod_validN : ValidN (iprod B) := λ n f, ∀ x, ✓{n} f x.
-
-  Definition iprod_lookup_op f g x : (f ⋅ g) x = f x ⋅ g x := eq_refl.
-  Definition iprod_lookup_core f x : (core f) x = core (f x) := eq_refl.
-
-  Lemma iprod_included_spec (f g : iprod B) : f ≼ g ↔ ∀ x, f x ≼ g x.
-  Proof.
-    split; [by intros [h Hh] x; exists (h x); rewrite /op /iprod_op (Hh x)|].
-    intros [h ?]%finite_choice. by exists h.
-  Qed.
-
-  Lemma iprod_cmra_mixin : CmraMixin (iprod B).
-  Proof.
-    apply cmra_total_mixin.
-    - eauto.
-    - by intros n f1 f2 f3 Hf x; rewrite iprod_lookup_op (Hf x).
-    - by intros n f1 f2 Hf x; rewrite iprod_lookup_core (Hf x).
-    - by intros n f1 f2 Hf ? x; rewrite -(Hf x).
-    - intros g; split.
-      + intros Hg n i; apply cmra_valid_validN, Hg.
-      + intros Hg i; apply cmra_valid_validN=> n; apply Hg.
-    - intros n f Hf x; apply cmra_validN_S, Hf.
-    - by intros f1 f2 f3 x; rewrite iprod_lookup_op assoc.
-    - by intros f1 f2 x; rewrite iprod_lookup_op comm.
-    - by intros f x; rewrite iprod_lookup_op iprod_lookup_core cmra_core_l.
-    - by intros f x; rewrite iprod_lookup_core cmra_core_idemp.
-    - intros f1 f2; rewrite !iprod_included_spec=> Hf x.
-      by rewrite iprod_lookup_core; apply cmra_core_mono, Hf.
-    - intros n f1 f2 Hf x; apply cmra_validN_op_l with (f2 x), Hf.
-    - intros n f f1 f2 Hf Hf12.
-      destruct (finite_choice (λ x (yy : B x * B x),
-        f x ≡ yy.1 ⋅ yy.2 ∧ yy.1 ≡{n}≡ f1 x ∧ yy.2 ≡{n}≡ f2 x)) as [gg Hgg].
-      { intros x. specialize (Hf12 x).
-        destruct (cmra_extend n (f x) (f1 x) (f2 x)) as (y1&y2&?&?&?); eauto.
-        exists (y1,y2); eauto. }
-      exists (λ x, gg x.1), (λ x, gg x.2). split_and!=> -?; naive_solver.
-  Qed.
-  Canonical Structure iprodR := CmraT (iprod B) iprod_cmra_mixin.
-
-  Instance iprod_unit : Unit (iprod B) := λ x, ε.
-  Definition iprod_lookup_empty x : ε x = ε := eq_refl.
-
-  Lemma iprod_ucmra_mixin : UcmraMixin (iprod B).
-  Proof.
-    split.
-    - intros x; apply ucmra_unit_valid.
-    - by intros f x; rewrite iprod_lookup_op left_id.
-    - constructor=> x. apply core_id_core, _.
-  Qed.
-  Canonical Structure iprodUR := UcmraT (iprod B) iprod_ucmra_mixin.
-
-  Global Instance iprod_unit_discrete :
-    (∀ i, Discrete (ε : B i)) → Discrete (ε : iprod B).
-  Proof. intros ? f Hf x. by apply: discrete. Qed.
-
-  (** Internalized properties *)
-  Lemma iprod_equivI {M} g1 g2 : g1 ≡ g2 ⊣⊢ (∀ i, g1 i ≡ g2 i : uPred M).
-  Proof. by uPred.unseal. Qed.
-  Lemma iprod_validI {M} g : ✓ g ⊣⊢ (∀ i, ✓ g i : uPred M).
-  Proof. by uPred.unseal. Qed.
-
-  (** Properties of iprod_insert. *)
-  Lemma iprod_insert_updateP x (P : B x → Prop) (Q : iprod B → Prop) g y1 :
-    y1 ~~>: P → (∀ y2, P y2 → Q (iprod_insert x y2 g)) →
-    iprod_insert x y1 g ~~>: Q.
-  Proof.
-    intros Hy1 HP; apply cmra_total_updateP.
-    intros n gf Hg. destruct (Hy1 n (Some (gf x))) as (y2&?&?).
-    { move: (Hg x). by rewrite iprod_lookup_op iprod_lookup_insert. }
-    exists (iprod_insert x y2 g); split; [auto|].
-    intros x'; destruct (decide (x' = x)) as [->|];
-      rewrite iprod_lookup_op ?iprod_lookup_insert //; [].
-    move: (Hg x'). by rewrite iprod_lookup_op !iprod_lookup_insert_ne.
-  Qed.
-
-  Lemma iprod_insert_updateP' x (P : B x → Prop) g y1 :
-    y1 ~~>: P →
-    iprod_insert x y1 g ~~>: λ g', ∃ y2, g' = iprod_insert x y2 g ∧ P y2.
-  Proof. eauto using iprod_insert_updateP. Qed.
-  Lemma iprod_insert_update g x y1 y2 :
-    y1 ~~> y2 → iprod_insert x y1 g ~~> iprod_insert x y2 g.
-  Proof.
-    rewrite !cmra_update_updateP; eauto using iprod_insert_updateP with subst.
-  Qed.
-End iprod_cmra.
-
-Arguments iprodR {_ _ _} _.
-Arguments iprodUR {_ _ _} _.
-
-Definition iprod_singleton `{Finite A} {B : A → ucmraT} 
-  (x : A) (y : B x) : iprod B := iprod_insert x y ε.
-Instance: Params (@iprod_singleton) 5.
-
-Section iprod_singleton.
-  Context `{Finite A} {B : A → ucmraT}.
-  Implicit Types x : A.
-
-  Global Instance iprod_singleton_ne x :
-    NonExpansive (iprod_singleton x : B x → _).
-  Proof. intros n y1 y2 ?; apply iprod_insert_ne. done. by apply equiv_dist. Qed.
-  Global Instance iprod_singleton_proper x :
-    Proper ((≡) ==> (≡)) (iprod_singleton x) := ne_proper _.
-
-  Lemma iprod_lookup_singleton x (y : B x) : (iprod_singleton x y) x = y.
-  Proof. by rewrite /iprod_singleton iprod_lookup_insert. Qed.
-  Lemma iprod_lookup_singleton_ne x x' (y : B x) :
-    x ≠ x' → (iprod_singleton x y) x' = ε.
-  Proof. intros; by rewrite /iprod_singleton iprod_lookup_insert_ne. Qed.
-
-  Global Instance iprod_singleton_discrete x (y : B x) :
-    (∀ i, Discrete (ε : B i)) →  Discrete y → Discrete (iprod_singleton x y).
-  Proof. apply _. Qed.
-
-  Lemma iprod_singleton_validN n x (y : B x) : ✓{n} iprod_singleton x y ↔ ✓{n} y.
-  Proof.
-    split; [by move=>/(_ x); rewrite iprod_lookup_singleton|].
-    move=>Hx x'; destruct (decide (x = x')) as [->|];
-      rewrite ?iprod_lookup_singleton ?iprod_lookup_singleton_ne //.
-    by apply ucmra_unit_validN.
-  Qed.
-
-  Lemma iprod_core_singleton x (y : B x) :
-    core (iprod_singleton x y) ≡ iprod_singleton x (core y).
-  Proof.
-    move=>x'; destruct (decide (x = x')) as [->|];
-      by rewrite iprod_lookup_core ?iprod_lookup_singleton
-      ?iprod_lookup_singleton_ne // (core_id_core ∅).
-  Qed.
-
-  Global Instance iprod_singleton_core_id x (y : B x) :
-    CoreId y → CoreId (iprod_singleton x y).
-  Proof. by rewrite !core_id_total iprod_core_singleton=> ->. Qed.
-
-  Lemma iprod_op_singleton (x : A) (y1 y2 : B x) :
-    iprod_singleton x y1 ⋅ iprod_singleton x y2 ≡ iprod_singleton x (y1 ⋅ y2).
-  Proof.
-    intros x'; destruct (decide (x' = x)) as [->|].
-    - by rewrite iprod_lookup_op !iprod_lookup_singleton.
-    - by rewrite iprod_lookup_op !iprod_lookup_singleton_ne // left_id.
-  Qed.
-
-  Lemma iprod_singleton_updateP x (P : B x → Prop) (Q : iprod B → Prop) y1 :
-    y1 ~~>: P → (∀ y2, P y2 → Q (iprod_singleton x y2)) →
-    iprod_singleton x y1 ~~>: Q.
-  Proof. rewrite /iprod_singleton; eauto using iprod_insert_updateP. Qed.
-  Lemma iprod_singleton_updateP' x (P : B x → Prop) y1 :
-    y1 ~~>: P →
-    iprod_singleton x y1 ~~>: λ g, ∃ y2, g = iprod_singleton x y2 ∧ P y2.
-  Proof. eauto using iprod_singleton_updateP. Qed.
-  Lemma iprod_singleton_update x (y1 y2 : B x) :
-    y1 ~~> y2 → iprod_singleton x y1 ~~> iprod_singleton x y2.
-  Proof. eauto using iprod_insert_update. Qed.
-
-  Lemma iprod_singleton_updateP_empty x (P : B x → Prop) (Q : iprod B → Prop) :
-    ε ~~>: P → (∀ y2, P y2 → Q (iprod_singleton x y2)) → ε ~~>: Q.
-  Proof.
-    intros Hx HQ; apply cmra_total_updateP.
-    intros n gf Hg. destruct (Hx n (Some (gf x))) as (y2&?&?); first apply Hg.