Avoid double instance for fupd_proper

theories/bi/updates.v

@@ -13,7 +13,7 @@ Notation "P ==∗ Q" := (P ⊢ |==> Q) (only parsing) : stdpp_scope.
 Notation "P ==∗ Q" := (P -∗ |==> Q)%I : bi_scope.
 
 Class FUpd (PROP : Type) : Type := fupd : coPset → coPset → PROP → PROP.
-Instance: Params (@fupd) 4 := {}.
+Instance: Params (@fupd) 2 := {}.
 Hint Mode FUpd ! : typeclass_instances.
 
 Notation "|={ E1 , E2 }=> Q" := (fupd E1 E2 Q) : bi_scope.
@@ -213,11 +213,9 @@ Section fupd_derived.
   Context `{BiFUpd PROP}.
   Implicit Types P Q R : PROP.
 
-  Global Instance fupd_proper' :
+  Global Instance fupd_proper :
     Proper ((≡) ==> (≡) ==> (≡) ==> (≡)) (fupd (PROP:=PROP)).
   Proof. solve_proper_prepare. exact: ne_proper. Qed.
-  Global Instance fupd_proper E1 E2 :
-    Proper ((≡) ==> (≡)) (fupd (PROP:=PROP) E1 E2). Proof. solve_proper. Qed.
 
   (** FUpd derived rules *)
   Global Instance fupd_mono' E1 E2 : Proper ((⊢) ==> (⊢)) (fupd (PROP:=PROP) E1 E2).