Seal the RulesetMember trait

+ use maplit instead of custom macro
+ fix two little issues in the documentation

ruma-common/Cargo.toml

@@ -12,6 +12,7 @@ edition = "2018"
 
 [dependencies]
 js_int = { version = "0.1.9", features = ["serde"] }
+maplit = "1.0.2"
 ruma-common-macros = { version = "=0.2.0", path = "../ruma-common-macros" }
 ruma-identifiers = { version = "0.17.4", path = "../ruma-identifiers" }
 ruma-serde = { version = "0.2.3", path = "../ruma-serde" }

ruma-common/src/push.rs

@@ -14,8 +14,8 @@
 //! - room rules
 //! - sender rules
 //!
-//! Each of these kind of rule has a corresponding type, that is
+//! Each of these kind of rule has a corresponding type that is
-//! just a wrapper arround another type:
+//! just a wrapper around another type:
 //!
 //! - `SimplePushRule` for room and sender rules
 //! - `ConditionalPushRule` for override and underride rules: push rules that may depend on a
@@ -112,11 +112,21 @@ impl IntoIterator for Ruleset {
 }
 
 /// A trait for types that can be added in a Ruleset
-pub trait RulesetMember {
+pub trait RulesetMember: private::Sealed {
     /// Adds a value in the correct field of a Ruleset.
     fn add_to(self, ruleset: &mut Ruleset) -> bool;
 }
 
+mod private {
+    // See <https://rust-lang.github.io/api-guidelines/future-proofing.html>
+    pub trait Sealed {}
+    impl Sealed for super::OverridePushRule {}
+    impl Sealed for super::UnderridePushRule {}
+    impl Sealed for super::ContentPushRule {}
+    impl Sealed for super::RoomPushRule {}
+    impl Sealed for super::SenderPushRule {}
+}
+
 /// Creates a new wrapper type around a PushRule-like type
 /// to make it possible to tell what kind of rule it is
 /// even if the inner type is the same.

ruma-common/src/push/predefined.rs

@@ -1,27 +1,15 @@
 ///! Constructors for [predefined push rules].
 ///!
 ///! [predefined push rules]: https://matrix.org/docs/spec/client_server/r0.6.1#predefined-rules
+
+use maplit::btreeset;
+use ruma_identifiers::UserId;
+
 use super::{
     Action::*, ConditionalPushRule, ContentPushRule, OverridePushRule, PatternedPushRule,
     PushCondition::*, RoomMemberCountIs, Ruleset, Tweak, UnderridePushRule,
 };
 
-use ruma_identifiers::UserId;
-
-macro_rules! set {
-    ($( $elt:expr ),*) => {
-        {
-            use std::collections::BTreeSet;
-
-            let mut s = BTreeSet::new();
-            $( s.insert( $elt ); )*
-            s
-        }
-    };
-    ($( $elt:expr ),* ,) => {
-        set![ $( $elt ),* ]
-    };
-}
 
 impl Ruleset {
     /// The list of all [predefined push rules].
@@ -34,8 +22,8 @@ impl Ruleset {
     ///   user's ID (for instance those to send notifications when they are mentioned).
     pub fn server_default(user_id: &UserId) -> Self {
         Self {
-            content: set![ContentPushRule::contains_user_name(user_id)],
+            content: btreeset![ContentPushRule::contains_user_name(user_id)],
-            override_: set![
+            override_: btreeset![
                 OverridePushRule::master(),
                 OverridePushRule::suppress_notices(),
                 OverridePushRule::invite_for_me(user_id),
@@ -44,7 +32,7 @@ impl Ruleset {
                 OverridePushRule::tombstone(),
                 OverridePushRule::roomnotif(),
             ],
-            underride: set![
+            underride: btreeset![
                 UnderridePushRule::call(),
                 UnderridePushRule::encrypted_room_one_to_one(),
                 UnderridePushRule::room_one_to_one(),