diff --git a/youmubot-cf/src/lib.rs b/youmubot-cf/src/lib.rs
index 08f3f54..6331a2d 100644
--- a/youmubot-cf/src/lib.rs
+++ b/youmubot-cf/src/lib.rs
@@ -176,7 +176,7 @@ pub async fn ranks(ctx: &Context, m: &Message) -> CommandResult {
     let ranks = Arc::new(ranks);
 
     const ITEMS_PER_PAGE: usize = 10;
-    let total_pages = (ranks.len() + ITEMS_PER_PAGE - 1) / ITEMS_PER_PAGE;
+    let total_pages = ranks.len().div_ceil(ITEMS_PER_PAGE);
     let last_updated = ranks.iter().map(|(_, cfu)| cfu.last_update).min().unwrap();
 
     paginate_reply(
@@ -308,7 +308,7 @@ pub(crate) async fn contest_rank_table(
     ranks: Vec<(Member, String, codeforces::RanklistRow)>,
 ) -> Result<()> {
     const ITEMS_PER_PAGE: usize = 10;
-    let total_pages = (ranks.len() + ITEMS_PER_PAGE - 1) / ITEMS_PER_PAGE;
+    let total_pages = ranks.len().div_ceil(ITEMS_PER_PAGE);
 
     if ranks.is_empty() {
         reply_to
diff --git a/youmubot-core/src/admin/ignore.rs b/youmubot-core/src/admin/ignore.rs
index 379bf0e..52b9665 100644
--- a/youmubot-core/src/admin/ignore.rs
+++ b/youmubot-core/src/admin/ignore.rs
@@ -82,7 +82,7 @@ async fn list<U: HasCoreEnv>(ctx: CmdContext<'_, U>) -> Result<()> {
         })
         .collect::<Vec<_>>()
         .join("\n");
-    let users = if users == "" {
+    let users = if users.is_empty() {
         "No one is being ignored!"
     } else {
         &users[..]
@@ -118,10 +118,7 @@ impl IgnoredUsers {
         Ok(Self { list: Arc::new(mp) })
     }
 
-    pub fn query<'a>(
-        &'a self,
-        id: UserId,
-    ) -> Option<impl std::ops::Deref<Target = IgnoredUser> + 'a> {
+    pub fn query(&self, id: UserId) -> Option<impl std::ops::Deref<Target = IgnoredUser> + '_> {
         self.list.get(&id)
     }
 
diff --git a/youmubot-core/src/community/roles.rs b/youmubot-core/src/community/roles.rs
index eaaf9d8..84d0be1 100644
--- a/youmubot-core/src/community/roles.rs
+++ b/youmubot-core/src/community/roles.rs
@@ -40,7 +40,7 @@ async fn list(ctx: &Context, m: &Message, _: Args) -> CommandResult {
                 .filter_map(|(_, role)| roles.get(&role.id).cloned().map(|r| (r, role.description)))
                 .collect();
             const ROLES_PER_PAGE: usize = 8;
-            let pages = (roles.len() + ROLES_PER_PAGE - 1) / ROLES_PER_PAGE;
+            let pages = roles.len().div_ceil(ROLES_PER_PAGE);
 
             paginate_reply(
                 paginate_from_fn(|page, btns| {
diff --git a/youmubot-core/src/fun/names.rs b/youmubot-core/src/fun/names.rs
index fd30491..c23596c 100644
--- a/youmubot-core/src/fun/names.rs
+++ b/youmubot-core/src/fun/names.rs
@@ -473,7 +473,7 @@ const FIRST_NAMES: [&str; 440] = [
     "Yusuke",
 ];
 
-const LAST_NAMES: [&str; 1051] = [
+static LAST_NAMES: [&str; 1051] = [
     // A Surnames
     "Abe",
     "Abukara",
diff --git a/youmubot-core/src/lib.rs b/youmubot-core/src/lib.rs
index d2470ae..3cf4d15 100644
--- a/youmubot-core/src/lib.rs
+++ b/youmubot-core/src/lib.rs
@@ -45,8 +45,8 @@ impl<T: AsRef<CoreEnv> + Send + Sync> HasCoreEnv for T {
 pub async fn setup(path: &std::path::Path, data: &mut TypeMap, prelude: Env) -> Result<CoreEnv> {
     db::load_role_list(
         &mut *data,
-        &path.join("roles_v2.yaml"),
-        &path.join("roles.yaml"),
+        path.join("roles_v2.yaml"),
+        path.join("roles.yaml"),
     )?;
 
     // Start reaction handlers
diff --git a/youmubot-db/src/lib.rs b/youmubot-db/src/lib.rs
index 34f09a3..dc7ee24 100644
--- a/youmubot-db/src/lib.rs
+++ b/youmubot-db/src/lib.rs
@@ -64,7 +64,7 @@ where
     }
 }
 
-impl<'a, T> DBWriteGuard<'a, T>
+impl<T> DBWriteGuard<'_, T>
 where
     T: Send + Sync + Clone + std::fmt::Debug + Serialize + DeserializeOwned,
 {
@@ -79,7 +79,7 @@ where
     }
 }
 
-impl<'a, T> Drop for DBWriteGuard<'a, T>
+impl<T> Drop for DBWriteGuard<'_, T>
 where
     T: Send + Sync + Clone + std::fmt::Debug + Serialize + DeserializeOwned,
 {
diff --git a/youmubot-osu/src/discord/announcer.rs b/youmubot-osu/src/discord/announcer.rs
index 1a0277c..da30934 100644
--- a/youmubot-osu/src/discord/announcer.rs
+++ b/youmubot-osu/src/discord/announcer.rs
@@ -291,7 +291,7 @@ impl<'a> CollectedScore<'a> {
     }
 }
 
-impl<'a> CollectedScore<'a> {
+impl CollectedScore<'_> {
     async fn send_message(
         self,
         ctx: impl CacheHttp,
diff --git a/youmubot-osu/src/discord/commands.rs b/youmubot-osu/src/discord/commands.rs
index 82a829c..f38f935 100644
--- a/youmubot-osu/src/discord/commands.rs
+++ b/youmubot-osu/src/discord/commands.rs
@@ -186,7 +186,6 @@ pub async fn save<U: HasOsuEnv>(
     ctx.defer().await?;
     let (u, mode, score, beatmap, info) = find_save_requirements(env, username).await?;
     let reply = ctx
-        .clone()
         .send(
             CreateReply::default()
                 .content(save_request_message(&u.username, score.beatmap_id, mode))
@@ -197,10 +196,10 @@ pub async fn save<U: HasOsuEnv>(
                 ]),
         )
         .await?;
-    let mut p = (reply, ctx.clone());
+    let mut p = (reply, ctx);
     match handle_save_respond(
         ctx.serenity_context(),
-        &env,
+        env,
         ctx.author().id,
         &mut p,
         &beatmap,
@@ -212,7 +211,7 @@ pub async fn save<U: HasOsuEnv>(
         Ok(_) => (),
         Err(e) => {
             p.0.delete(ctx).await?;
-            return Err(e.into());
+            return Err(e);
         }
     };
 
@@ -235,8 +234,8 @@ pub async fn forcesave<U: HasOsuEnv>(
     else {
         return Err(Error::msg("osu! user not found"));
     };
-    add_user(discord_name.id, &u, &env).await?;
-    let ex = UserExtras::from_user(&env, &u, u.preferred_mode).await?;
+    add_user(discord_name.id, &u, env).await?;
+    let ex = UserExtras::from_user(env, &u, u.preferred_mode).await?;
     ctx.send(
         CreateReply::default()
             .content(
@@ -289,8 +288,7 @@ async fn handle_listing<U: HasOsuEnv>(
                         user.mention()
                     ))
                     .embed({
-                        let mut b =
-                            transform(nth + 1, score_embed(&play, &beatmap, &content, user));
+                        let mut b = transform(nth + 1, score_embed(play, &beatmap, &content, user));
                         if let Some(rank) = play.global_rank {
                             b = b.world_record(rank as u16);
                         }
@@ -301,15 +299,15 @@ async fn handle_listing<U: HasOsuEnv>(
             .await?;
 
             // Save the beatmap...
-            cache::save_beatmap(&env, ctx.channel_id(), &beatmap).await?;
+            cache::save_beatmap(env, ctx.channel_id(), &beatmap).await?;
         }
         Nth::All => {
             let header = format!("Here are the {} plays by {}!", listing_kind, user.mention());
-            let reply = ctx.clone().reply(&header).await?;
+            let reply = ctx.reply(&header).await?;
             style
                 .display_scores(
                     plays,
-                    ctx.clone().serenity_context(),
+                    ctx.serenity_context(),
                     ctx.guild_id(),
                     (reply, ctx).with_header(header),
                 )
@@ -380,11 +378,10 @@ async fn beatmap<U: HasOsuEnv>(
         EmbedType::Beatmapset(vec, _) => {
             let b0 = &vec[0];
             let msg = ctx
-                .clone()
                 .reply(format!("Information for {}", b0.beatmapset_mention()))
                 .await?;
             display_beatmapset(
-                ctx.clone().serenity_context(),
+                ctx.serenity_context(),
                 vec,
                 mode,
                 mods,
@@ -480,7 +477,7 @@ async fn check<U: HasOsuEnv>(
         args.user.mention(),
         display
     );
-    let msg = ctx.clone().reply(&header).await?;
+    let msg = ctx.reply(&header).await?;
 
     let style = style.unwrap_or(if scores.len() <= 5 {
         ScoreListStyle::Grid
@@ -491,7 +488,7 @@ async fn check<U: HasOsuEnv>(
     style
         .display_scores(
             scores,
-            ctx.clone().serenity_context(),
+            ctx.serenity_context(),
             ctx.guild_id(),
             (msg, ctx).with_header(header),
         )
@@ -512,7 +509,7 @@ async fn ranks<U: HasOsuEnv>(
     let guild = ctx.partial_guild().await.unwrap();
     ctx.defer().await?;
     server_rank::do_server_ranks(
-        ctx.clone().serenity_context(),
+        ctx.serenity_context(),
         env,
         &guild,
         mode,
@@ -551,7 +548,7 @@ async fn leaderboard<U: HasOsuEnv>(
     let scoreboard_msg = embed.mention();
     let (mut scores, show_diff) = get_leaderboard_from_embed(
         ctx.serenity_context(),
-        &env,
+        env,
         embed,
         None,
         unranked.unwrap_or(true),
diff --git a/youmubot-osu/src/discord/db.rs b/youmubot-osu/src/discord/db.rs
index eaa5501..9496c53 100644
--- a/youmubot-osu/src/discord/db.rs
+++ b/youmubot-osu/src/discord/db.rs
@@ -176,7 +176,7 @@ impl From<model::OsuUser> for OsuUser {
 impl From<OsuUser> for crate::models::UserHeader {
     fn from(value: OsuUser) -> Self {
         Self {
-            id: value.id as u64,
+            id: value.id,
             username: value.username.to_string(),
         }
     }
diff --git a/youmubot-osu/src/discord/display.rs b/youmubot-osu/src/discord/display.rs
index a9eee4e..088599a 100644
--- a/youmubot-osu/src/discord/display.rs
+++ b/youmubot-osu/src/discord/display.rs
@@ -138,7 +138,7 @@ mod scores {
                     .await?
                     .ok_or_else(|| Error::msg("user not found"))?;
 
-                save_beatmap(&env, self.channel_id, &bm).await?;
+                save_beatmap(env, self.channel_id, &bm).await?;
                 Ok(Some(
                     CreateReply::default()
                         .embed({
@@ -479,7 +479,7 @@ mod beatmapset {
                 .oppai
                 .get_beatmap(b.beatmap_id)
                 .await
-                .map(move |v| v.get_possible_pp_with(b.mode.with_override(self.mode), &mods))
+                .map(move |v| v.get_possible_pp_with(b.mode.with_override(self.mode), mods))
         }
     }
 
diff --git a/youmubot-osu/src/discord/embeds.rs b/youmubot-osu/src/discord/embeds.rs
index bc0c4cd..571e86c 100644
--- a/youmubot-osu/src/discord/embeds.rs
+++ b/youmubot-osu/src/discord/embeds.rs
@@ -269,7 +269,7 @@ pub(crate) struct ScoreEmbedBuilder<'a> {
     footer: Option<String>,
 }
 
-impl<'a> ScoreEmbedBuilder<'a> {
+impl ScoreEmbedBuilder<'_> {
     pub fn top_record(mut self, rank: u8) -> Self {
         self.top_record = Some(rank);
         self
@@ -304,7 +304,7 @@ pub(crate) fn score_embed<'a>(
     }
 }
 
-impl<'a> ScoreEmbedBuilder<'a> {
+impl ScoreEmbedBuilder<'_> {
     #[allow(clippy::many_single_char_names)]
     pub fn build(mut self) -> CreateEmbed {
         let mode = self.bm.mode();
@@ -471,7 +471,7 @@ pub(crate) struct FakeScore<'a> {
     pub max_combo: Option<u32>,
 }
 
-impl<'a> FakeScore<'a> {
+impl FakeScore<'_> {
     fn score_origin(&self, attrs: &OsuPerformanceAttributes) -> OsuScoreOrigin {
         if !self.mods.is_lazer {
             OsuScoreOrigin::Stable
diff --git a/youmubot-osu/src/discord/hook.rs b/youmubot-osu/src/discord/hook.rs
index bde485f..3a0d568 100644
--- a/youmubot-osu/src/discord/hook.rs
+++ b/youmubot-osu/src/discord/hook.rs
@@ -135,7 +135,7 @@ pub fn dot_osu_hook<'a>(
             .collect::<Vec<_>>()
             .await;
 
-        const ARCHIVE_EXTS: [&'static str; 2] = [".osz", ".olz"];
+        const ARCHIVE_EXTS: [&str; 2] = [".osz", ".olz"];
         let osz_embeds = msg
             .attachments
             .iter()
diff --git a/youmubot-osu/src/discord/interaction.rs b/youmubot-osu/src/discord/interaction.rs
index b1900db..d2fc8c6 100644
--- a/youmubot-osu/src/discord/interaction.rs
+++ b/youmubot-osu/src/discord/interaction.rs
@@ -109,7 +109,7 @@ pub fn handle_check_button<'a>(
 
         let guild_id = comp.guild_id;
         ScoreListStyle::Grid
-            .display_scores(scores, &ctx, guild_id, (comp, ctx).with_header(header))
+            .display_scores(scores, ctx, guild_id, (comp, ctx).with_header(header))
             .await
             .pls_ok();
         Ok(())
@@ -209,7 +209,7 @@ pub fn handle_simulate_button<'a>(
 
         let Some(query) = comp
             .quick_modal(
-                &ctx,
+                ctx,
                 CreateQuickModal::new(format!(
                     "Simulate Score on beatmap `{}`",
                     b.short_link(None, Mods::NOMOD)
@@ -263,7 +263,7 @@ async fn handle_simluate_query(
         let (mods, max_combo, c100, c50, cmiss) =
             (&inputs[0], &inputs[1], &inputs[2], &inputs[3], &inputs[4]);
         let mods = UnparsedMods::from_str(mods)
-            .map_err(|v| Error::msg(v))?
+            .map_err(Error::msg)?
             .to_mods(mode)?;
         let info = content.get_info_with(mode, &mods);
         let max_combo = max_combo.parse::<u32>().ok();
@@ -351,7 +351,7 @@ async fn handle_last_req(
                 &ctx,
                 serenity::all::CreateInteractionResponseFollowup::new()
                     .content(content_type)
-                    .embed(beatmap_embed(&*b, m.unwrap_or(b.mode), &mods, &info))
+                    .embed(beatmap_embed(&b, m.unwrap_or(b.mode), &mods, &info))
                     .components(vec![beatmap_components(m.unwrap_or(b.mode), comp.guild_id)]),
             )
             .await?;
diff --git a/youmubot-osu/src/discord/mod.rs b/youmubot-osu/src/discord/mod.rs
index 70165c7..34bd53f 100644
--- a/youmubot-osu/src/discord/mod.rs
+++ b/youmubot-osu/src/discord/mod.rs
@@ -361,7 +361,7 @@ pub(crate) async fn handle_save_respond(
             .is_some_and(|s| s.beatmap_id == map_id))
     }
     let msg_id = reply.get_message().await?.id;
-    let recv = InteractionCollector::create(&ctx, msg_id).await?;
+    let recv = InteractionCollector::create(ctx, msg_id).await?;
     let timeout = std::time::Duration::from_secs(300) + beatmap.difficulty.total_length;
     let completed = loop {
         let Some(reaction) = recv.next(timeout).await else {
@@ -385,7 +385,7 @@ pub(crate) async fn handle_save_respond(
         return Ok(());
     }
 
-    add_user(sender, &user, &env).await?;
+    add_user(sender, &user, env).await?;
     let ex = UserExtras::from_user(env, &user, mode).await?;
     reply
         .apply_edit(
@@ -450,7 +450,7 @@ async fn add_user(target: serenity::model::id::UserId, user: &User, env: &OsuEnv
     let modes = [Mode::Std, Mode::Taiko, Mode::Catch, Mode::Mania]
         .into_iter()
         .map(|mode| {
-            let mode = mode.clone();
+            let mode = mode;
             async move {
                 let pp = async {
                     env.client
@@ -790,7 +790,7 @@ pub async fn pins(ctx: &Context, msg: &Message, mut args: Args) -> CommandResult
                     &ctx,
                     CreateMessage::new()
                         .content("Here is the play that you requested".to_string())
-                        .embed(score_embed(&play, &beatmap_mode, &content, user).build())
+                        .embed(score_embed(play, &beatmap_mode, &content, user).build())
                         .components(vec![score_components(msg.guild_id)])
                         .reference_message(msg),
                 )
@@ -908,13 +908,11 @@ pub(crate) async fn load_beatmap(
         None => load_beatmap_from_channel(env, channel_id).await,
     };
 
-    if req == LoadRequest::Beatmapset {
-        if embed.is_none() {
-            if let Some(EmbedType::Beatmap(b, mode, _, _)) = fallback {
-                return EmbedType::from_beatmapset_id(env, b.beatmapset_id, mode)
-                    .await
-                    .ok();
-            }
+    if req == LoadRequest::Beatmapset && embed.is_none() {
+        if let Some(EmbedType::Beatmap(b, mode, _, _)) = fallback {
+            return EmbedType::from_beatmapset_id(env, b.beatmapset_id, mode)
+                .await
+                .ok();
         }
     }
     embed
@@ -1052,7 +1050,7 @@ pub(crate) async fn do_check(
             .scores(b.beatmap_id, |f| f.user(UserID::ID(user.id)).mode(m))
             .and_then(|v| v.get_all())
             .map_ok(move |mut v| {
-                v.retain(|s| mods.as_ref().is_none_or(|m| s.mods.contains(&m)));
+                v.retain(|s| mods.as_ref().is_none_or(|m| s.mods.contains(m)));
                 v
             })
             .await
@@ -1060,7 +1058,7 @@ pub(crate) async fn do_check(
 
     let mut scores = match embed {
         EmbedType::Beatmap(beatmap, mode, _, _) => {
-            fetch_for_beatmap(env, &**beatmap, *mode, &mods, user).await?
+            fetch_for_beatmap(env, beatmap, *mode, &mods, user).await?
         }
         EmbedType::Beatmapset(vec, mode) => vec
             .iter()
@@ -1118,7 +1116,7 @@ pub async fn top(ctx: &Context, msg: &Message, mut args: Args) -> CommandResult
                             user.mention()
                         ))
                         .embed(
-                            score_embed(&play, &beatmap, &content, user)
+                            score_embed(play, &beatmap, &content, user)
                                 .top_record(nth + 1)
                                 .build(),
                         )
diff --git a/youmubot-osu/src/discord/server_rank.rs b/youmubot-osu/src/discord/server_rank.rs
index 476e1e9..551ea4c 100644
--- a/youmubot-osu/src/discord/server_rank.rs
+++ b/youmubot-osu/src/discord/server_rank.rs
@@ -234,7 +234,7 @@ where
     let users = Arc::new(users);
     let last_update = last_update.unwrap();
     let total_len = users.len();
-    let total_pages = (total_len + ITEMS_PER_PAGE - 1) / ITEMS_PER_PAGE;
+    let total_pages = total_len.div_ceil(ITEMS_PER_PAGE);
     paginate_with_first_message(
         paginate_from_fn(move |page: u8, btns| {
             let header = header.clone();
@@ -404,7 +404,7 @@ pub async fn show_leaderboard(ctx: &Context, msg: &Message, mut args: Args) -> C
 
     let header = format!(
         "Here are the top scores of **{}** on {}",
-        guild.name(&ctx).unwrap(),
+        guild.name(ctx).unwrap(),
         scoreboard_msg,
     );
     let has_lazer_score = scores.iter().any(|v| v.score.mods.is_lazer);
@@ -587,7 +587,7 @@ pub async fn get_leaderboard_from_embed(
             let iter = std::iter::once(*map);
             let scores = get_leaderboard(
                 ctx,
-                &env,
+                env,
                 iter,
                 mode_override.or(mode),
                 show_unranked,
@@ -603,7 +603,7 @@ pub async fn get_leaderboard_from_embed(
             (
                 get_leaderboard(
                     ctx,
-                    &env,
+                    env,
                     maps,
                     mode_override.or(mode),
                     show_unranked,
@@ -689,7 +689,7 @@ pub(crate) fn rankings_to_table(
                         } else {
                             beatmap.difficulty_name.clone()
                         };
-                        format!("[{:.2}*] {} {}", star, trimmed_diff, score.mods.to_string())
+                        format!("[{:.2}*] {} {}", star, trimmed_diff, score.mods)
                     } else {
                         score.mods.to_string()
                     },
@@ -716,7 +716,7 @@ pub async fn display_rankings_table(
 ) -> Result<()> {
     const ITEMS_PER_PAGE: usize = 5;
     let total_len = scores.len();
-    let total_pages = (total_len + ITEMS_PER_PAGE - 1) / ITEMS_PER_PAGE;
+    let total_pages = total_len.div_ceil(ITEMS_PER_PAGE);
     let header = to.content.clone();
 
     paginate_with_first_message(
diff --git a/youmubot-osu/src/models/mod.rs b/youmubot-osu/src/models/mod.rs
index 27bd6cc..f28d5b0 100644
--- a/youmubot-osu/src/models/mod.rs
+++ b/youmubot-osu/src/models/mod.rs
@@ -125,9 +125,9 @@ impl Difficulty {
 
         if let Some(ratio) = mods.inner.clock_rate() {
             if ratio != 1.0 {
-                diff.apply_length_by_ratio(1.0 / ratio as f64);
-                diff.apply_ar_by_time_ratio(1.0 / ratio as f64);
-                diff.apply_od_by_time_ratio(1.0 / ratio as f64);
+                diff.apply_length_by_ratio(1.0 / ratio);
+                diff.apply_ar_by_time_ratio(1.0 / ratio);
+                diff.apply_od_by_time_ratio(1.0 / ratio);
             }
         }
 
@@ -587,7 +587,7 @@ pub struct User {
 }
 
 impl User {
-    pub fn mention<'a>(&'a self) -> impl Display + 'a {
+    pub fn mention(&self) -> impl Display + '_ {
         UserHeaderLink(&self.username, self.id)
     }
 
@@ -603,14 +603,14 @@ impl User {
 #[derive(Debug, Clone)]
 struct UserHeaderLink<'a>(&'a String, u64);
 
-impl<'a> Display for UserHeaderLink<'a> {
+impl Display for UserHeaderLink<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "[{}](<https://osu.ppy.sh/users/{}>)", self.0, self.1)
     }
 }
 
 impl UserHeader {
-    pub fn mention<'a>(&'a self) -> impl Display + 'a {
+    pub fn mention(&self) -> impl Display + '_ {
         UserHeaderLink(&self.username, self.id)
     }
 
diff --git a/youmubot-osu/src/models/rosu.rs b/youmubot-osu/src/models/rosu.rs
index 0c9cb98..7df21d5 100644
--- a/youmubot-osu/src/models/rosu.rs
+++ b/youmubot-osu/src/models/rosu.rs
@@ -116,7 +116,7 @@ impl From<rosu::score::Score> for Score {
             s.score as u64
         } else {
             s.classic_score
-        } as u64;
+        };
         Self {
             id: Some(s.id),
             user_id: s.user_id as u64,
diff --git a/youmubot-osu/src/request/mod.rs b/youmubot-osu/src/request/mod.rs
index a13eee0..eb13d29 100644
--- a/youmubot-osu/src/request/mod.rs
+++ b/youmubot-osu/src/request/mod.rs
@@ -215,7 +215,7 @@ pub mod builders {
                     match &self.mods {
                         Some(mods) => r.await.map(|mut ss| {
                             ss.retain(|s| {
-                                Mods::from_gamemods(s.mods.clone(), s.set_on_lazer).contains(&mods)
+                                Mods::from_gamemods(s.mods.clone(), s.set_on_lazer).contains(mods)
                             });
                             ss
                         }),
@@ -225,7 +225,7 @@ pub mod builders {
                 None => {
                     let mut r = osu.rosu.beatmap_scores(self.beatmap_id as u32).global();
                     if let Some(mode) = &self.mode {
-                        r = r.mode(mode.clone().into());
+                        r = r.mode((*mode).into());
                     }
                     if let Some(mods) = &self.mods {
                         r = r.mods(GameModsIntermode::from(mods.inner.clone()));
@@ -241,7 +241,7 @@ pub mod builders {
         pub(crate) async fn build(self, osu: &OsuClient) -> Result<impl Scores> {
             // user queries always return all scores, so no need to consider offset.
             // otherwise, it's not working anyway...
-            Ok(self.fetch_scores(osu, 0).await?)
+            self.fetch_scores(osu, 0).await
         }
     }
 
diff --git a/youmubot-osu/src/request/scores.rs b/youmubot-osu/src/request/scores.rs
index 1ef3171..f113009 100644
--- a/youmubot-osu/src/request/scores.rs
+++ b/youmubot-osu/src/request/scores.rs
@@ -106,7 +106,7 @@ impl Scores for Vec<Score> {
     }
 
     async fn find<F: FnMut(&Score) -> bool + Send>(&mut self, mut f: F) -> Result<Option<&Score>> {
-        Ok(self.iter().find(|v| f(*v)))
+        Ok(self.iter().find(|v| f(v)))
     }
 }
 
@@ -155,7 +155,7 @@ impl<T: FetchScores> Scores for ScoresFetcher<T> {
 
     /// Get the index-th score.
     async fn get(&mut self, index: usize) -> Result<Option<&Score>> {
-        Ok(self.get_range(index..(index + 1)).await?.get(0))
+        Ok(self.get_range(index..(index + 1)).await?.first())
     }
 
     /// Get all scores.
diff --git a/youmubot-prelude/src/interaction_collector.rs b/youmubot-prelude/src/interaction_collector.rs
index 09007ad..4faefc6 100644
--- a/youmubot-prelude/src/interaction_collector.rs
+++ b/youmubot-prelude/src/interaction_collector.rs
@@ -42,6 +42,12 @@ impl Drop for InteractionCollectorGuard {
     }
 }
 
+impl Default for InteractionCollector {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl InteractionCollector {
     pub fn new() -> Self {
         Self {
@@ -51,7 +57,7 @@ impl InteractionCollector {
     /// Create a new collector, returning a receiver.
     pub fn create_collector(&self, msg: MessageId) -> InteractionCollectorGuard {
         let (send, recv) = flume::unbounded();
-        self.channels.insert(msg.clone(), send);
+        self.channels.insert(msg, send);
         InteractionCollectorGuard {
             msg_id: msg,
             ch: recv,
diff --git a/youmubot-prelude/src/pagination.rs b/youmubot-prelude/src/pagination.rs
index eea9b6f..434df6c 100644
--- a/youmubot-prelude/src/pagination.rs
+++ b/youmubot-prelude/src/pagination.rs
@@ -43,7 +43,7 @@ impl<T: CanEdit> CanEdit for WithHeaders<T> {
     }
 }
 
-impl<'a> CanEdit for (Message, &'a Context) {
+impl CanEdit for (Message, &Context) {
     async fn get_message(&self) -> Result<Message> {
         Ok(self.0.clone())
     }
@@ -56,7 +56,7 @@ impl<'a> CanEdit for (Message, &'a Context) {
     }
 }
 
-impl<'a, 'b> CanEdit for (&'a ComponentInteraction, &'b Context) {
+impl CanEdit for (&ComponentInteraction, &Context) {
     async fn get_message(&self) -> Result<Message> {
         Ok(self.0.get_response(&self.1.http).await?)
     }
@@ -72,7 +72,7 @@ impl<'a, 'b> CanEdit for (&'a ComponentInteraction, &'b Context) {
     }
 }
 
-impl<'a, 'e, Env: Send + Sync> CanEdit for (ReplyHandle<'a>, CmdContext<'e, Env>) {
+impl<Env: Send + Sync> CanEdit for (ReplyHandle<'_>, CmdContext<'_, Env>) {
     async fn get_message(&self) -> Result<Message> {
         Ok(self.0.message().await?.into_owned())
     }
@@ -326,13 +326,7 @@ pub async fn handle_pagination_reaction(
     let new_page = match reaction {
         PREV | FAST_PREV if page == 0 => return Ok(page),
         PREV => page - 1,
-        FAST_PREV => {
-            if page < fast {
-                0
-            } else {
-                page - fast
-            }
-        }
+        FAST_PREV => page.saturating_sub(fast),
         NEXT if pages.filter(|&pages| page as usize + 1 >= pages).is_some() => return Ok(page),
         NEXT => page + 1,
         FAST_NEXT => (pages.unwrap() as u8 - 1).min(page + fast),
diff --git a/youmubot-prelude/src/ratelimit.rs b/youmubot-prelude/src/ratelimit.rs
index 122f96e..6354d8e 100644
--- a/youmubot-prelude/src/ratelimit.rs
+++ b/youmubot-prelude/src/ratelimit.rs
@@ -50,14 +50,14 @@ impl<T> Ratelimit<T> {
     }
 }
 
-impl<'a, T> Deref for RatelimitGuard<'a, T> {
+impl<T> Deref for RatelimitGuard<'_, T> {
     type Target = T;
     fn deref(&self) -> &Self::Target {
         self.inner
     }
 }
 
-impl<'a, T> Drop for RatelimitGuard<'a, T> {
+impl<T> Drop for RatelimitGuard<'_, T> {
     fn drop(&mut self) {
         let send = self.send.clone();
         let wait_time = *self.wait_time;