diff --git a/miette-derive/src/utils.rs b/miette-derive/src/utils.rs
index 39d7696..2d58444 100644
--- a/miette-derive/src/utils.rs
+++ b/miette-derive/src/utils.rs
@@ -1,8 +1,6 @@
 use proc_macro2::TokenStream;
 use quote::{format_ident, quote};
-use syn::{
-    spanned::Spanned,
-};
+use syn::spanned::Spanned;
 
 use crate::{
     diagnostic::{DiagnosticConcreteArgs, DiagnosticDef},
diff --git a/src/eyreish/mod.rs b/src/eyreish/mod.rs
index 2dfbf71..3f35103 100644
--- a/src/eyreish/mod.rs
+++ b/src/eyreish/mod.rs
@@ -172,11 +172,7 @@ pub trait ReportHandler: core::any::Any + Send + Sync {
     ///     }
     /// }
     /// ```
-    fn debug(
-        &self,
-        error: &(dyn Diagnostic),
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result;
+    fn debug(&self, error: &dyn Diagnostic, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result;
 
     /// Override for the `Display` format
     fn display(
diff --git a/src/handler.rs b/src/handler.rs
index c993c43..5cd5a53 100644
--- a/src/handler.rs
+++ b/src/handler.rs
@@ -402,7 +402,7 @@ impl Default for MietteHandler {
 }
 
 impl ReportHandler for MietteHandler {
-    fn debug(&self, diagnostic: &(dyn Diagnostic), f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    fn debug(&self, diagnostic: &dyn Diagnostic, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if f.alternate() {
             return fmt::Debug::fmt(diagnostic, f);
         }
diff --git a/src/handlers/debug.rs b/src/handlers/debug.rs
index 50450a4..629908b 100644
--- a/src/handlers/debug.rs
+++ b/src/handlers/debug.rs
@@ -31,7 +31,7 @@ impl DebugReportHandler {
     pub fn render_report(
         &self,
         f: &mut fmt::Formatter<'_>,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
     ) -> fmt::Result {
         let mut diag = f.debug_struct("Diagnostic");
         diag.field("message", &format!("{}", diagnostic));
@@ -61,7 +61,7 @@ impl DebugReportHandler {
 }
 
 impl ReportHandler for DebugReportHandler {
-    fn debug(&self, diagnostic: &(dyn Diagnostic), f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    fn debug(&self, diagnostic: &dyn Diagnostic, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if f.alternate() {
             return fmt::Debug::fmt(diagnostic, f);
         }
diff --git a/src/handlers/graphical.rs b/src/handlers/graphical.rs
index faac695..37b6bf8 100644
--- a/src/handlers/graphical.rs
+++ b/src/handlers/graphical.rs
@@ -242,7 +242,7 @@ impl GraphicalReportHandler {
     pub fn render_report(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
     ) -> fmt::Result {
         self.render_report_inner(f, diagnostic, diagnostic.source_code())
     }
@@ -250,7 +250,7 @@ impl GraphicalReportHandler {
     fn render_report_inner(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         parent_src: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         let src = diagnostic.source_code().or(parent_src);
@@ -281,7 +281,7 @@ impl GraphicalReportHandler {
     fn render_header(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         is_nested: bool,
     ) -> fmt::Result {
         let severity_style = match diagnostic.severity() {
@@ -326,7 +326,7 @@ impl GraphicalReportHandler {
     fn render_causes(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         parent_src: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         let src = diagnostic.source_code().or(parent_src);
@@ -424,7 +424,7 @@ impl GraphicalReportHandler {
         Ok(())
     }
 
-    fn render_footer(&self, f: &mut impl fmt::Write, diagnostic: &(dyn Diagnostic)) -> fmt::Result {
+    fn render_footer(&self, f: &mut impl fmt::Write, diagnostic: &dyn Diagnostic) -> fmt::Result {
         if let Some(help) = diagnostic.help() {
             let width = self.termwidth.saturating_sub(2);
             let initial_indent = "  help: ".style(self.theme.styles.help).to_string();
@@ -447,7 +447,7 @@ impl GraphicalReportHandler {
     fn render_related(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         parent_src: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         let src = diagnostic.source_code().or(parent_src);
@@ -535,7 +535,7 @@ impl GraphicalReportHandler {
     fn render_snippets(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         opt_source: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         let source = match opt_source {
@@ -1361,7 +1361,7 @@ impl GraphicalReportHandler {
 }
 
 impl ReportHandler for GraphicalReportHandler {
-    fn debug(&self, diagnostic: &(dyn Diagnostic), f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    fn debug(&self, diagnostic: &dyn Diagnostic, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if f.alternate() {
             return fmt::Debug::fmt(diagnostic, f);
         }
diff --git a/src/handlers/json.rs b/src/handlers/json.rs
index 0b4a405..e37064c 100644
--- a/src/handlers/json.rs
+++ b/src/handlers/json.rs
@@ -60,7 +60,7 @@ impl JSONReportHandler {
     pub fn render_report(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
     ) -> fmt::Result {
         self._render_report(f, diagnostic, None)
     }
@@ -68,7 +68,7 @@ impl JSONReportHandler {
     fn _render_report(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         parent_src: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         write!(f, r#"{{"message": "{}","#, escape(&diagnostic.to_string()))?;
@@ -154,7 +154,7 @@ impl JSONReportHandler {
     fn render_snippets(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         source: &dyn SourceCode,
     ) -> fmt::Result {
         if let Some(mut labels) = diagnostic.labels() {
@@ -170,7 +170,7 @@ impl JSONReportHandler {
 }
 
 impl ReportHandler for JSONReportHandler {
-    fn debug(&self, diagnostic: &(dyn Diagnostic), f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    fn debug(&self, diagnostic: &dyn Diagnostic, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.render_report(f, diagnostic)
     }
 }
diff --git a/src/handlers/narratable.rs b/src/handlers/narratable.rs
index f8d36ae..8dead98 100644
--- a/src/handlers/narratable.rs
+++ b/src/handlers/narratable.rs
@@ -69,7 +69,7 @@ impl NarratableReportHandler {
     pub fn render_report(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
     ) -> fmt::Result {
         self.render_header(f, diagnostic)?;
         if self.with_cause_chain {
@@ -85,7 +85,7 @@ impl NarratableReportHandler {
         Ok(())
     }
 
-    fn render_header(&self, f: &mut impl fmt::Write, diagnostic: &(dyn Diagnostic)) -> fmt::Result {
+    fn render_header(&self, f: &mut impl fmt::Write, diagnostic: &dyn Diagnostic) -> fmt::Result {
         writeln!(f, "{}", diagnostic)?;
         let severity = match diagnostic.severity() {
             Some(Severity::Error) | None => "error",
@@ -96,7 +96,7 @@ impl NarratableReportHandler {
         Ok(())
     }
 
-    fn render_causes(&self, f: &mut impl fmt::Write, diagnostic: &(dyn Diagnostic)) -> fmt::Result {
+    fn render_causes(&self, f: &mut impl fmt::Write, diagnostic: &dyn Diagnostic) -> fmt::Result {
         if let Some(cause_iter) = diagnostic
             .diagnostic_source()
             .map(DiagnosticChain::from_diagnostic)
@@ -110,7 +110,7 @@ impl NarratableReportHandler {
         Ok(())
     }
 
-    fn render_footer(&self, f: &mut impl fmt::Write, diagnostic: &(dyn Diagnostic)) -> fmt::Result {
+    fn render_footer(&self, f: &mut impl fmt::Write, diagnostic: &dyn Diagnostic) -> fmt::Result {
         if let Some(help) = diagnostic.help() {
             writeln!(f, "diagnostic help: {}", help)?;
         }
@@ -126,7 +126,7 @@ impl NarratableReportHandler {
     fn render_related(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         parent_src: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         if let Some(related) = diagnostic.related() {
@@ -152,7 +152,7 @@ impl NarratableReportHandler {
     fn render_snippets(
         &self,
         f: &mut impl fmt::Write,
-        diagnostic: &(dyn Diagnostic),
+        diagnostic: &dyn Diagnostic,
         source_code: Option<&dyn SourceCode>,
     ) -> fmt::Result {
         if let Some(source) = source_code {
@@ -344,7 +344,7 @@ impl NarratableReportHandler {
 }
 
 impl ReportHandler for NarratableReportHandler {
-    fn debug(&self, diagnostic: &(dyn Diagnostic), f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    fn debug(&self, diagnostic: &dyn Diagnostic, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if f.alternate() {
             return fmt::Debug::fmt(diagnostic, f);
         }