diff --git a/alacritty/src/display/mod.rs b/alacritty/src/display/mod.rs
index ec3f9ac7..7bd50049 100644
--- a/alacritty/src/display/mod.rs
+++ b/alacritty/src/display/mod.rs
@@ -134,7 +134,7 @@ impl From<glutin::ContextError> for Error {
 }
 
 /// Terminal size info.
-#[derive(Serialize, Deserialize, Debug, Copy, Clone, PartialEq)]
+#[derive(Serialize, Deserialize, Debug, Copy, Clone, PartialEq, Eq)]
 pub struct SizeInfo<T = f32> {
     /// Terminal window width.
     width: T,
diff --git a/alacritty/src/display/window.rs b/alacritty/src/display/window.rs
index ad89738d..480654cf 100644
--- a/alacritty/src/display/window.rs
+++ b/alacritty/src/display/window.rs
@@ -524,7 +524,7 @@ impl Window {
 
         let value = if has_shadows { YES } else { NO };
         unsafe {
-            let _: () = msg_send![raw_window, setHasShadow: value];
+            let _: id = msg_send![raw_window, setHasShadow: value];
         }
     }
 
diff --git a/alacritty_terminal/src/ansi.rs b/alacritty_terminal/src/ansi.rs
index 3f33a1cb..ff468ffc 100644
--- a/alacritty_terminal/src/ansi.rs
+++ b/alacritty_terminal/src/ansi.rs
@@ -1090,7 +1090,7 @@ where
                     return unhandled(params);
                 }
 
-                let clipboard = params[1].get(0).unwrap_or(&b'c');
+                let clipboard = params[1].first().unwrap_or(&b'c');
                 match params[2] {
                     b"?" => self.handler.clipboard_load(*clipboard, terminator),
                     base64 => self.handler.clipboard_store(*clipboard, base64),
@@ -1175,7 +1175,7 @@ where
             },
             ('C', []) | ('a', []) => handler.move_forward(Column(next_param_or(1) as usize)),
             ('c', intermediates) if next_param_or(0) == 0 => {
-                handler.identify_terminal(intermediates.get(0).map(|&i| i as char))
+                handler.identify_terminal(intermediates.first().map(|&i| i as char))
             },
             ('D', []) => handler.move_backward(Column(next_param_or(1) as usize)),
             ('d', []) => handler.goto_line(Line(next_param_or(1) as i32 - 1)),
@@ -1201,7 +1201,7 @@ where
             },
             ('h', intermediates) => {
                 for param in params_iter.map(|param| param[0]) {
-                    match Mode::from_primitive(intermediates.get(0), param) {
+                    match Mode::from_primitive(intermediates.first(), param) {
                         Some(mode) => handler.set_mode(mode),
                         None => unhandled!(),
                     }
@@ -1238,7 +1238,7 @@ where
             ('L', []) => handler.insert_blank_lines(next_param_or(1) as usize),
             ('l', intermediates) => {
                 for param in params_iter.map(|param| param[0]) {
-                    match Mode::from_primitive(intermediates.get(0), param) {
+                    match Mode::from_primitive(intermediates.first(), param) {
                         Some(mode) => handler.unset_mode(mode),
                         None => unhandled!(),
                     }
diff --git a/alacritty_terminal/src/grid/mod.rs b/alacritty_terminal/src/grid/mod.rs
index 8b94ac41..b42c5075 100644
--- a/alacritty_terminal/src/grid/mod.rs
+++ b/alacritty_terminal/src/grid/mod.rs
@@ -540,7 +540,7 @@ impl Dimensions for (usize, usize) {
     }
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 pub struct Indexed<T> {
     pub point: Point,
     pub cell: T,