diff --git a/src/handler.rs b/src/handler.rs
index 95382c09..efbee864 100644
--- a/src/handler.rs
+++ b/src/handler.rs
@@ -11,22 +11,17 @@ use crate::ThemeCharacters;
 use crate::ThemeStyles;
 
 /// Settings to control the color format used for graphical rendering.
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Default)]
 pub enum RgbColors {
     /// Use RGB colors even if the terminal does not support them
     Always,
     /// Use RGB colors instead of ANSI if the terminal supports RGB
     Preferred,
     /// Always use ANSI, regardless of terminal support for RGB
+    #[default]
     Never,
 }
 
-impl Default for RgbColors {
-    fn default() -> RgbColors {
-        RgbColors::Never
-    }
-}
-
 /**
 Create a custom [`MietteHandler`] from options.
 
diff --git a/src/handlers/graphical.rs b/src/handlers/graphical.rs
index 9c1d7ab1..dc2a776f 100644
--- a/src/handlers/graphical.rs
+++ b/src/handlers/graphical.rs
@@ -359,7 +359,7 @@ impl GraphicalReportHandler {
 
                         // If there was no header, remove the leading newline
                         let inner = inner.trim_start_matches('\n');
-                        writeln!(f, "{}", self.wrap(&inner, opts))?;
+                        writeln!(f, "{}", self.wrap(inner, opts))?;
                     }
                     ErrorKind::StdError(err) => {
                         writeln!(f, "{}", self.wrap(&err.to_string(), opts))?;
@@ -667,7 +667,7 @@ impl GraphicalReportHandler {
                     f,
                     max_gutter,
                     line,
-                    &labels,
+                    labels,
                     LabelRenderMode::SingleLine,
                 )?;
 
@@ -683,7 +683,7 @@ impl GraphicalReportHandler {
                     f,
                     max_gutter,
                     line,
-                    &labels,
+                    labels,
                     LabelRenderMode::MultiLineFirst,
                 )?;
 
@@ -701,7 +701,7 @@ impl GraphicalReportHandler {
                         f,
                         max_gutter,
                         line,
-                        &labels,
+                        labels,
                         LabelRenderMode::MultiLineRest,
                     )?;
                     self.render_multi_line_end_single(
@@ -714,13 +714,7 @@ impl GraphicalReportHandler {
             }
         } else {
             // gutter _again_
-            self.render_highlight_gutter(
-                f,
-                max_gutter,
-                line,
-                &labels,
-                LabelRenderMode::SingleLine,
-            )?;
+            self.render_highlight_gutter(f, max_gutter, line, labels, LabelRenderMode::SingleLine)?;
             // has no label
             writeln!(f, "{}", self.theme.characters.hbar.style(label.style))?;
         }
@@ -894,12 +888,10 @@ impl GraphicalReportHandler {
                     } else {
                         result.push_str(opts.initial_indent);
                     }
+                } else if line.trim().is_empty() {
+                    result.push_str(trimmed_indent);
                 } else {
-                    if line.trim().is_empty() {
-                        result.push_str(trimmed_indent);
-                    } else {
-                        result.push_str(opts.subsequent_indent);
-                    }
+                    result.push_str(opts.subsequent_indent);
                 }
                 result.push_str(line);
             }
diff --git a/src/highlighters/syntect.rs b/src/highlighters/syntect.rs
index 57ebadf8..69ed0159 100644
--- a/src/highlighters/syntect.rs
+++ b/src/highlighters/syntect.rs
@@ -1,6 +1,7 @@
 use std::path::Path;
 
 // all syntect imports are explicitly qualified, but their paths are shortened for convenience
+#[allow(clippy::module_inception)]
 mod syntect {
     pub(super) use syntect::{
         highlighting::{
@@ -96,7 +97,7 @@ impl SyntectHighlighter {
         }
         // finally, attempt to guess syntax based on first line
         return self.syntax_set.find_syntax_by_first_line(
-            &std::str::from_utf8(contents.data())
+            std::str::from_utf8(contents.data())
                 .ok()?
                 .split('\n')
                 .next()?,
@@ -116,13 +117,13 @@ pub(crate) struct SyntectHighlighterState<'h> {
 
 impl<'h> HighlighterState for SyntectHighlighterState<'h> {
     fn highlight_line<'s>(&mut self, line: &'s str) -> Vec<Styled<&'s str>> {
-        if let Ok(ops) = self.parse_state.parse_line(line, &self.syntax_set) {
+        if let Ok(ops) = self.parse_state.parse_line(line, self.syntax_set) {
             let use_bg_color = self.use_bg_color;
             syntect::HighlightIterator::new(
                 &mut self.highlight_state,
                 &ops,
                 line,
-                &mut self.highlighter,
+                &self.highlighter,
             )
             .map(|(style, str)| (convert_style(style, use_bg_color).style(str)))
             .collect()
diff --git a/src/panic.rs b/src/panic.rs
index ad98cacb..c258b320 100644
--- a/src/panic.rs
+++ b/src/panic.rs
@@ -12,7 +12,7 @@ pub fn set_panic_hook() {
             message = msg.to_string();
         }
         if let Some(msg) = payload.downcast_ref::<String>() {
-            message = msg.clone();
+            message.clone_from(msg);
         }
         let mut report: Result<()> = Err(Panic(message).into());
         if let Some(loc) = info.location() {