diff --git a/src/game/inventory.rs b/src/game/inventory.rs
index dbb5ab1..6599d8e 100644
--- a/src/game/inventory.rs
+++ b/src/game/inventory.rs
@@ -52,8 +52,8 @@ impl Inventory {
     }
 
     pub fn handle(&mut self, cmd: UiCommand, rpg: &Rpg, ui: &mut Ui) {
-        match cmd.data {
-            UiCommandData::Inventory(c) => match c {
+        if let UiCommandData::Inventory(c) = cmd.data {
+            match c {
                 Command::Show => {
                     self.show(rpg, ui);
                 }
@@ -77,7 +77,6 @@ impl Inventory {
                     self.internal.as_mut().unwrap().toggle_mouse_mode(ui);
                 }
             }
-            _ => {}
         }
     }
 
@@ -259,7 +258,7 @@ impl Internal {
         let obj = world.objects().get(self.obj);
         for item in &obj.inventory.items {
             let item_obj = &world.objects().get(item.object);
-            let inv_list_item = Self::to_inv_list_item(item, item_obj);
+            let inv_list_item = Self::make_list_item(item, item_obj);
             match () {
                 _ if item_obj.flags.contains(Flag::Worn) => {
                     assert!(wearing.items().is_empty());
@@ -283,7 +282,7 @@ impl Internal {
     }
 
     // display_inventory_info
-    fn to_inv_list_item(item: &InventoryItem, obj: &Object) -> inventory_list::Item {
+    fn make_list_item(item: &InventoryItem, obj: &Object) -> inventory_list::Item {
         let proto = obj.proto().unwrap();
         let count = if obj.item_kind() == Some(ItemKind::Ammo) {
             obj.proto().unwrap().max_ammo_count().unwrap() * (item.count - 1)
@@ -521,9 +520,9 @@ impl Internal {
         };
         let msg = BString::concat(&[
             name.as_bytes(),
-            "\n--------------------\n".as_bytes(),
+            b"\n--------------------\n",
             description.as_bytes(),
-            "\n".as_bytes(),
+            b"\n",
             weight_msg.as_bytes()]);
         ui.widget_mut::<Panel>(self.item_descr).text_mut().unwrap().text = msg;
         self.switch_text_panels(false, ui);
diff --git a/src/game/object.rs b/src/game/object.rs
index bfed394..59cad5e 100644
--- a/src/game/object.rs
+++ b/src/game/object.rs
@@ -1106,7 +1106,6 @@ impl Objects {
     /// 1. There's a path between them which is not sight-blocked (see `sight_blocker_for_object()`).
     /// 2. Screen distance between objects is within the limit.
     // action_can_talk_to()
-    #[must_use]
     pub fn can_talk(&self, obj1: Handle, obj2: Handle) -> Result<(), CantTalkSpatial> {
         let o1 = self.get(obj1);
         let o2 = self.get(obj2);
diff --git a/src/game/state.rs b/src/game/state.rs
index 1e3a0aa..693ed70 100644
--- a/src/game/state.rs
+++ b/src/game/state.rs
@@ -116,7 +116,7 @@ impl GameState {
 
         let world_view_rect = Rect::with_size(0, 0, 640, 379);
         let world_view = {
-            let win = ui.new_window(world_view_rect.clone(), None);
+            let win = ui.new_window(world_view_rect, None);
             ui.new_widget(win, world_view_rect, None, None, WorldView::new(world.clone()))
         };
         let message_panel = hud::create(ui);
diff --git a/src/game/ui/action_menu.rs b/src/game/ui/action_menu.rs
index 83480fb..845246b 100644
--- a/src/game/ui/action_menu.rs
+++ b/src/game/ui/action_menu.rs
@@ -21,7 +21,7 @@ pub fn show(actions: Vec<(Action, UiCommandData)>, win: Handle, ui: &mut Ui) ->
     };
 
     ui.show_cursor_ghost();
-    ui.set_cursor_constraint(placement.rect.clone());
+    ui.set_cursor_constraint(placement.rect);
     ui.set_cursor_pos(placement.rect.top_left());
 
     let action_menu = ui.new_widget(win, placement.rect, Some(Cursor::Hidden), None,
diff --git a/src/game/ui/inventory_list.rs b/src/game/ui/inventory_list.rs
index 6753e98..f1d9e8d 100644
--- a/src/game/ui/inventory_list.rs
+++ b/src/game/ui/inventory_list.rs
@@ -77,7 +77,7 @@ impl InventoryList {
 
     pub fn can_scroll(&self, scroll: Scroll) -> bool {
         match scroll {
-            Scroll::Down => self.scroll_idx + 1 <= self.max_scroll_idx(),
+            Scroll::Down => self.scroll_idx < self.max_scroll_idx(),
             Scroll::Up => self.scroll_idx > 0,
         }
     }
@@ -89,7 +89,7 @@ impl InventoryList {
     pub fn scroll(&mut self, scroll: Scroll) {
         self.set_scroll_idx(match scroll {
             Scroll::Down => self.scroll_idx + 1,
-            Scroll::Up => self.scroll_idx.checked_sub(1).unwrap_or(0),
+            Scroll::Up => self.scroll_idx.saturating_sub(1),
         });
     }
 
@@ -106,7 +106,7 @@ impl InventoryList {
     }
 
     fn max_scroll_idx(&self) -> usize {
-        self.items.len().checked_sub(self.visible_items).unwrap_or(0)
+        self.items.len().saturating_sub(self.visible_items)
     }
 
     fn item_index_at(&self, rect: Rect, pos: Point) -> Option<usize> {