diff --git a/core/build_playerglobal/src/lib.rs b/core/build_playerglobal/src/lib.rs
index f6a92eaf0..ef438407a 100644
--- a/core/build_playerglobal/src/lib.rs
+++ b/core/build_playerglobal/src/lib.rs
@@ -55,7 +55,7 @@ pub fn build_playerglobal(
     match status {
         Ok(code) => {
             if !code.success() {
-                return Err(format!("Compiling failed with code {:?}", code).into());
+                return Err(format!("Compiling failed with code {code:?}").into());
             }
         }
         Err(err) => {
@@ -95,7 +95,7 @@ fn resolve_multiname_name<'a>(abc: &'a AbcFile, multiname: &Multiname) -> &'a st
     if let Multiname::QName { name, .. } | Multiname::Multiname { name, .. } = multiname {
         &abc.constant_pool.strings[name.0 as usize - 1]
     } else {
-        panic!("Unexpected Multiname {:?}", multiname);
+        panic!("Unexpected Multiname {multiname:?}");
     }
 }
 
@@ -106,10 +106,10 @@ fn resolve_multiname_ns<'a>(abc: &'a AbcFile, multiname: &Multiname) -> &'a str
         if let Namespace::Package(p) = ns {
             &abc.constant_pool.strings[p.0 as usize - 1]
         } else {
-            panic!("Unexpected Namespace {:?}", ns);
+            panic!("Unexpected Namespace {ns:?}");
         }
     } else {
-        panic!("Unexpected Multiname {:?}", multiname);
+        panic!("Unexpected Multiname {multiname:?}");
     }
 }
 
@@ -265,7 +265,7 @@ fn write_native_table(data: &[u8], out_dir: &Path) -> Result<Vec<u8>, Box<dyn st
                 method
             }
             TraitKind::Function { .. } => {
-                panic!("TraitKind::Function is not supported: {:?}", trait_)
+                panic!("TraitKind::Function is not supported: {trait_:?}")
             }
             _ => return,
         };
@@ -308,7 +308,7 @@ fn write_native_table(data: &[u8], out_dir: &Path) -> Result<Vec<u8>, Box<dyn st
             let name = &abc.constant_pool.strings[metadata.name.0 as usize - 1];
             match name.as_str() {
                 RUFFLE_METADATA_NAME => {}
-                _ => panic!("Unexpected class metadata {:?}", name),
+                _ => panic!("Unexpected class metadata {name:?}"),
             }
 
             for item in &metadata.items {
@@ -326,7 +326,7 @@ fn write_native_table(data: &[u8], out_dir: &Path) -> Result<Vec<u8>, Box<dyn st
                         rust_instance_allocators[class_id as usize] =
                             rust_method_name_and_path(&abc, trait_, None, "", &method_name);
                     }
-                    _ => panic!("Unexpected metadata pair ({:?}, {})", key, value),
+                    _ => panic!("Unexpected metadata pair ({key:?}, {value})"),
                 }
             }
         }
diff --git a/core/build_playerglobal/src/main.rs b/core/build_playerglobal/src/main.rs
index 659c89dc1..f245e2263 100644
--- a/core/build_playerglobal/src/main.rs
+++ b/core/build_playerglobal/src/main.rs
@@ -29,7 +29,7 @@ fn main() {
             let tmp = root.join("tmp");
             if let Err(e) = std::fs::create_dir(&tmp) {
                 if e.kind() != ErrorKind::AlreadyExists {
-                    panic!("Failed to create temporary folder {}", e);
+                    panic!("Failed to create temporary folder {e}");
                 }
             }
             let classes_dir = repo_root.join("core/src/avm2/globals/");
@@ -53,7 +53,7 @@ fn main() {
             let pmd = Pmd::open(classes_dir, tmp.join("pmd.xml")).expect("Invalid PMD xml file");
             std::fs::remove_dir_all(tmp).expect("Failed to delete temp folder");
             if pmd.contains_violations() {
-                eprintln!("{}", pmd);
+                eprintln!("{pmd}");
                 std::process::exit(1);
             }
         }
diff --git a/core/macros/src/lib.rs b/core/macros/src/lib.rs
index ecf627642..4999e49db 100644
--- a/core/macros/src/lib.rs
+++ b/core/macros/src/lib.rs
@@ -105,7 +105,7 @@ pub fn enum_trait_object(args: TokenStream, item: TokenStream) -> TokenStream {
                     block: parse_quote!(#method_block),
                 })
             }
-            _ => panic!("Unsupported trait item: {:?}", item),
+            _ => panic!("Unsupported trait item: {item:?}"),
         })
         .collect();
 
diff --git a/core/src/avm1/activation.rs b/core/src/avm1/activation.rs
index 2cdd28e97..b4fe75ca5 100644
--- a/core/src/avm1/activation.rs
+++ b/core/src/avm1/activation.rs
@@ -108,7 +108,7 @@ pub struct ActivationIdentifier<'a> {
 impl fmt::Display for ActivationIdentifier<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         if let Some(parent) = self.parent {
-            write!(f, "{} / ", parent)?;
+            write!(f, "{parent} / ")?;
         }
 
         f.write_str(&self.name)?;
@@ -2324,9 +2324,9 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
 
                 match method {
                     NavigationMethod::Get if !url.contains(b'?') => {
-                        Request::get(format!("{}?{}", url, qstring))
+                        Request::get(format!("{url}?{qstring}"))
                     }
-                    NavigationMethod::Get => Request::get(format!("{}&{}", url, qstring)),
+                    NavigationMethod::Get => Request::get(format!("{url}&{qstring}")),
                     NavigationMethod::Post => Request::post(
                         url.to_utf8_lossy().into_owned(),
                         Some((
diff --git a/core/src/avm1/debug.rs b/core/src/avm1/debug.rs
index 1ce9a142b..72e731c50 100644
--- a/core/src/avm1/debug.rs
+++ b/core/src/avm1/debug.rs
@@ -178,7 +178,7 @@ impl<'a> VariableDumper<'a> {
         for key in keys.into_iter() {
             self.output.push_str(name);
             self.output.push('.');
-            let _ = write!(self.output, "{}", key);
+            let _ = write!(self.output, "{key}");
             self.output.push_str(" = ");
             self.print_property(object, key, activation);
             self.output.push('\n');
diff --git a/core/src/avm1/function.rs b/core/src/avm1/function.rs
index ddee453dd..a52308deb 100644
--- a/core/src/avm1/function.rs
+++ b/core/src/avm1/function.rs
@@ -314,7 +314,7 @@ impl fmt::Debug for Executable<'_> {
         match self {
             Executable::Native(nf) => f
                 .debug_tuple("Executable::Native")
-                .field(&format!("{:p}", nf))
+                .field(&format!("{nf:p}"))
                 .finish(),
             Executable::Action(af) => f.debug_tuple("Executable::Action").field(&af).finish(),
         }
diff --git a/core/src/avm1/globals/shared_object.rs b/core/src/avm1/globals/shared_object.rs
index d5e87d99c..95ac11c27 100644
--- a/core/src/avm1/globals/shared_object.rs
+++ b/core/src/avm1/globals/shared_object.rs
@@ -326,7 +326,7 @@ pub fn get_local<'gc>(
     // Final SO path: foo.com/folder/game.swf/SOName
     // SOName may be a path containing slashes. In this case, prefix with # to mimic Flash Player behavior.
     let prefix = if name.contains('/') { "#" } else { "" };
-    let full_name = format!("{}/{}/{}{}", movie_host, local_path, prefix, name);
+    let full_name = format!("{movie_host}/{local_path}/{prefix}{name}");
 
     // Avoid any paths with `..` to prevent SWFs from crawling the file system on desktop.
     // Flash will generally fail to save shared objects with a path component starting with `.`,
diff --git a/core/src/avm1/globals/system.rs b/core/src/avm1/globals/system.rs
index 706ab35f3..a9b163111 100644
--- a/core/src/avm1/globals/system.rs
+++ b/core/src/avm1/globals/system.rs
@@ -108,9 +108,9 @@ impl Manufacturer {
         };
 
         if version <= 8 {
-            format!("Macromedia {}", os_part)
+            format!("Macromedia {os_part}")
         } else {
-            format!("Adobe {}", os_part)
+            format!("Adobe {os_part}")
         }
     }
 
diff --git a/core/src/avm1/test_utils.rs b/core/src/avm1/test_utils.rs
index bb3df6027..7338e9ea7 100644
--- a/core/src/avm1/test_utils.rs
+++ b/core/src/avm1/test_utils.rs
@@ -23,7 +23,7 @@ where
         let this = root.object().coerce_to_object(&mut activation);
         let result = test(&mut activation, this);
         if let Err(e) = result {
-            panic!("Encountered exception during test: {}", e);
+            panic!("Encountered exception during test: {e}");
         }
     })
 }
diff --git a/core/src/avm1/value.rs b/core/src/avm1/value.rs
index efe21ba37..b74be7ead 100644
--- a/core/src/avm1/value.rs
+++ b/core/src/avm1/value.rs
@@ -655,7 +655,7 @@ fn f64_to_string(mut n: f64) -> Cow<'static, str> {
                     buf.truncate(1);
                 }
             }
-            let _ = write!(&mut buf, "e{:+}", exp);
+            let _ = write!(&mut buf, "e{exp:+}");
         }
 
         // One final band-aid to eliminate any leading zeros.
diff --git a/core/src/avm2/activation.rs b/core/src/avm2/activation.rs
index 5f3c5cf85..f0ff4c5af 100644
--- a/core/src/avm2/activation.rs
+++ b/core/src/avm2/activation.rs
@@ -246,7 +246,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         self.resolve_definition(name)?
             .and_then(|maybe| maybe.as_object())
             .and_then(|o| o.as_class_object())
-            .ok_or_else(|| format!("Attempted to resolve nonexistent type {:?}", name).into())
+            .ok_or_else(|| format!("Attempted to resolve nonexistent type {name:?}").into())
     }
 
     /// Resolve a type name to a class.
@@ -312,8 +312,8 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
             return Ok(Value::Undefined);
         } else {
             return Err(format!(
-                "Param {} (index {}) was missing when calling {}",
-                param_config.param_name, index, method_name
+                "Param {} (index {index}) was missing when calling {method_name}",
+                param_config.param_name
             )
             .into());
         };
@@ -564,7 +564,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         self.local_registers
             .get(id)
             .cloned()
-            .ok_or_else(|| format!("Out of bounds register read: {}", id).into())
+            .ok_or_else(|| format!("Out of bounds register read: {id}").into())
     }
 
     /// Set a local register.
@@ -580,7 +580,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
 
             Ok(())
         } else {
-            Err(format!("Out of bounds register write: {}", id).into())
+            Err(format!("Out of bounds register write: {id}").into())
         }
     }
 
diff --git a/core/src/avm2/call_stack.rs b/core/src/avm2/call_stack.rs
index 4d1969458..9149de3d2 100644
--- a/core/src/avm2/call_stack.rs
+++ b/core/src/avm2/call_stack.rs
@@ -53,6 +53,6 @@ impl<'gc> std::fmt::Display for CallStack<'gc> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let mut output = WString::new();
         self.display(&mut output);
-        write!(f, "{}", output)
+        write!(f, "{output}")
     }
 }
diff --git a/core/src/avm2/error.rs b/core/src/avm2/error.rs
index 447b559d2..7f8001221 100644
--- a/core/src/avm2/error.rs
+++ b/core/src/avm2/error.rs
@@ -122,7 +122,7 @@ fn error_constructor<'gc>(
 
 impl<'gc> std::fmt::Display for Error<'gc> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{:?}", self)
+        write!(f, "{self:?}")
     }
 }
 
diff --git a/core/src/avm2/globals/flash/display/bitmapdata.rs b/core/src/avm2/globals/flash/display/bitmapdata.rs
index 21f986b9a..8f5210260 100644
--- a/core/src/avm2/globals/flash/display/bitmapdata.rs
+++ b/core/src/avm2/globals/flash/display/bitmapdata.rs
@@ -764,7 +764,7 @@ pub fn draw<'gc>(
         } else if let Some(source_bitmap) = source.as_bitmap_data() {
             IBitmapDrawable::BitmapData(source_bitmap)
         } else {
-            return Err(format!("BitmapData.draw: unexpected source {:?}", source).into());
+            return Err(format!("BitmapData.draw: unexpected source {source:?}").into());
         };
 
         bitmap_data.draw(
diff --git a/core/src/avm2/globals/flash/display/displayobject.rs b/core/src/avm2/globals/flash/display/displayobject.rs
index 59ef6f8a2..072e0c348 100644
--- a/core/src/avm2/globals/flash/display/displayobject.rs
+++ b/core/src/avm2/globals/flash/display/displayobject.rs
@@ -941,7 +941,7 @@ fn set_mask<'gc>(
                 .coerce_to_object(activation)?
                 .as_display_object()
                 .ok_or_else(|| -> Error {
-                    format!("Mask is not a DisplayObject: {:?}", mask).into()
+                    format!("Mask is not a DisplayObject: {mask:?}").into()
                 })?;
 
             this.set_masker(activation.context.gc_context, Some(mask), true);
diff --git a/core/src/avm2/globals/flash/display/displayobjectcontainer.rs b/core/src/avm2/globals/flash/display/displayobjectcontainer.rs
index 47b70a2f0..27ace5e1d 100644
--- a/core/src/avm2/globals/flash/display/displayobjectcontainer.rs
+++ b/core/src/avm2/globals/flash/display/displayobjectcontainer.rs
@@ -407,7 +407,7 @@ pub fn remove_children<'gc>(
             }
 
             if from > to {
-                return Err(format!("RangeError: Range {} to {} is invalid", from, to).into());
+                return Err(format!("RangeError: Range {from} to {to} is invalid").into());
             }
 
             ctr.remove_range(
@@ -475,11 +475,11 @@ pub fn swap_children_at<'gc>(
             let bounds = ctr.num_children();
 
             if index0 < 0 || index0 as usize >= bounds {
-                return Err(format!("RangeError: Index {} is out of bounds", index0).into());
+                return Err(format!("RangeError: Index {index0} is out of bounds").into());
             }
 
             if index1 < 0 || index1 as usize >= bounds {
-                return Err(format!("RangeError: Index {} is out of bounds", index1).into());
+                return Err(format!("RangeError: Index {index1} is out of bounds").into());
             }
 
             let child0 = ctr.child_by_index(index0 as usize).unwrap();
diff --git a/core/src/avm2/globals/flash/net/sharedobject.rs b/core/src/avm2/globals/flash/net/sharedobject.rs
index 867a30fde..7a8a8b14d 100644
--- a/core/src/avm2/globals/flash/net/sharedobject.rs
+++ b/core/src/avm2/globals/flash/net/sharedobject.rs
@@ -153,7 +153,7 @@ pub fn get_local<'gc>(
     // Final SO path: foo.com/folder/game.swf/SOName
     // SOName may be a path containing slashes. In this case, prefix with # to mimic Flash Player behavior.
     let prefix = if name.contains('/') { "#" } else { "" };
-    let full_name = format!("{}/{}/{}{}", movie_host, local_path, prefix, name);
+    let full_name = format!("{movie_host}/{local_path}/{prefix}{name}");
 
     // Avoid any paths with `..` to prevent SWFs from crawling the file system on desktop.
     // Flash will generally fail to save shared objects with a path component starting with `.`,
diff --git a/core/src/avm2/globals/flash/net/url_loader.rs b/core/src/avm2/globals/flash/net/url_loader.rs
index 2b03da392..87fbd34d1 100644
--- a/core/src/avm2/globals/flash/net/url_loader.rs
+++ b/core/src/avm2/globals/flash/net/url_loader.rs
@@ -32,7 +32,7 @@ pub fn load<'gc>(
         } else if &data_format == b"variables" {
             DataFormat::Variables
         } else {
-            return Err(format!("Unknown data format: {}", data_format).into());
+            return Err(format!("Unknown data format: {data_format}").into());
         };
 
         return spawn_fetch(activation, this, request, data_format);
diff --git a/core/src/avm2/globals/flash/text/textfield.rs b/core/src/avm2/globals/flash/text/textfield.rs
index 09b824306..222bb3451 100644
--- a/core/src/avm2/globals/flash/text/textfield.rs
+++ b/core/src/avm2/globals/flash/text/textfield.rs
@@ -624,7 +624,7 @@ pub fn set_type<'gc>(
         } else if &is_editable == b"dynamic" {
             this.set_editable(false, &mut activation.context);
         } else {
-            return Err(format!("Invalid TextField.type: {}", is_editable).into());
+            return Err(format!("Invalid TextField.type: {is_editable}").into());
         }
     }
 
diff --git a/core/src/avm2/globals/int.rs b/core/src/avm2/globals/int.rs
index 124552e94..1bb06227f 100644
--- a/core/src/avm2/globals/int.rs
+++ b/core/src/avm2/globals/int.rs
@@ -151,7 +151,7 @@ fn to_exponential<'gc>(
 
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
-                    format!("{0:.1$e}", number, digits)
+                    format!("{number:.digits$e}")
                         .replace('e', "e+")
                         .replace("e+-", "e-")
                         .replace("e+0", ""),
diff --git a/core/src/avm2/globals/number.rs b/core/src/avm2/globals/number.rs
index 5b223d4ec..0ad7a2a08 100644
--- a/core/src/avm2/globals/number.rs
+++ b/core/src/avm2/globals/number.rs
@@ -164,7 +164,7 @@ fn to_exponential<'gc>(
 
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
-                    format!("{0:.1$e}", number, digits)
+                    format!("{number:.digits$e}")
                         .replace('e', "e+")
                         .replace("e+-", "e-")
                         .replace("e+0", ""),
@@ -198,7 +198,7 @@ fn to_fixed<'gc>(
 
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
-                    format!("{0:.1$}", number, digits),
+                    format!("{number:.digits$}"),
                 )
                 .into());
             }
@@ -234,7 +234,7 @@ pub fn print_with_precision<'gc>(
     } else {
         Ok(AvmString::new_utf8(
             activation.context.gc_context,
-            format!("{}", precision),
+            format!("{precision}"),
         ))
     }
 }
diff --git a/core/src/avm2/globals/toplevel.rs b/core/src/avm2/globals/toplevel.rs
index 5d1dc8583..f304fb11b 100644
--- a/core/src/avm2/globals/toplevel.rs
+++ b/core/src/avm2/globals/toplevel.rs
@@ -111,9 +111,9 @@ pub fn escape<'gc>(
             output.push(x);
         } else {
             let encode = if x <= u8::MAX.into() {
-                format!("%{:02X}", x)
+                format!("%{x:02X}")
             } else {
-                format!("%u{:04X}", x)
+                format!("%u{x:04X}")
             };
             output.push_str(WStr::from_units(encode.as_bytes()));
         }
diff --git a/core/src/avm2/globals/uint.rs b/core/src/avm2/globals/uint.rs
index 3f39460dd..db386deec 100644
--- a/core/src/avm2/globals/uint.rs
+++ b/core/src/avm2/globals/uint.rs
@@ -150,7 +150,7 @@ fn to_exponential<'gc>(
 
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
-                    format!("{0:.1$e}", number, digits)
+                    format!("{number:.digits$e}")
                         .replace('e', "e+")
                         .replace("e+-", "e-")
                         .replace("e+0", ""),
diff --git a/core/src/avm2/object.rs b/core/src/avm2/object.rs
index c0087caa0..5901c0447 100644
--- a/core/src/avm2/object.rs
+++ b/core/src/avm2/object.rs
@@ -425,7 +425,7 @@ pub trait TObject<'gc>: 'gc + Collect + Debug + Into<Object<'gc>> + Clone + Copy
             return method_object.call(Some(self.into()), arguments, activation);
         }
 
-        Err(format!("Cannot call unknown method id {}", id).into())
+        Err(format!("Cannot call unknown method id {id}").into())
     }
 
     /// Implements the `in` opcode and AS3 operator.
@@ -735,7 +735,7 @@ pub trait TObject<'gc>: 'gc + Collect + Debug + Into<Object<'gc>> + Clone + Copy
 
         Ok(AvmString::new_utf8(
             activation.context.gc_context,
-            format!("[object {}]", class_name),
+            format!("[object {class_name}]"),
         )
         .into())
     }
@@ -759,7 +759,7 @@ pub trait TObject<'gc>: 'gc + Collect + Debug + Into<Object<'gc>> + Clone + Copy
 
         Ok(AvmString::new_utf8(
             activation.context.gc_context,
-            format!("[object {}]", class_name),
+            format!("[object {class_name}]"),
         )
         .into())
     }
diff --git a/core/src/avm2/object/class_object.rs b/core/src/avm2/object/class_object.rs
index 0f3c8679e..09c9ee46b 100644
--- a/core/src/avm2/object/class_object.rs
+++ b/core/src/avm2/object/class_object.rs
@@ -317,7 +317,7 @@ impl<'gc> ClassObject<'gc> {
             let interface = scope.resolve(&interface_name, activation)?;
 
             if interface.is_none() {
-                return Err(format!("Could not resolve interface {:?}", interface_name).into());
+                return Err(format!("Could not resolve interface {interface_name:?}").into());
             }
 
             let iface_class = interface
diff --git a/core/src/avm2/object/primitive_object.rs b/core/src/avm2/object/primitive_object.rs
index 34b80ee93..3d4616608 100644
--- a/core/src/avm2/object/primitive_object.rs
+++ b/core/src/avm2/object/primitive_object.rs
@@ -123,7 +123,7 @@ impl<'gc> TObject<'gc> for PrimitiveObject<'gc> {
 
                 Ok(AvmString::new_utf8(
                     activation.context.gc_context,
-                    format!("[object {}]", class_name),
+                    format!("[object {class_name}]"),
                 )
                 .into())
             }
diff --git a/core/src/avm2/object/script_object.rs b/core/src/avm2/object/script_object.rs
index d59cf0d0f..aa5b2cd30 100644
--- a/core/src/avm2/object/script_object.rs
+++ b/core/src/avm2/object/script_object.rs
@@ -293,7 +293,7 @@ impl<'gc> ScriptObjectData<'gc> {
         self.slots
             .get(id as usize)
             .cloned()
-            .ok_or_else(|| format!("Slot index {} out of bounds!", id).into())
+            .ok_or_else(|| format!("Slot index {id} out of bounds!").into())
     }
 
     /// Set a slot by its index.
@@ -307,7 +307,7 @@ impl<'gc> ScriptObjectData<'gc> {
             *slot = value;
             Ok(())
         } else {
-            Err(format!("Slot index {} out of bounds!", id).into())
+            Err(format!("Slot index {id} out of bounds!").into())
         }
     }
 
@@ -322,7 +322,7 @@ impl<'gc> ScriptObjectData<'gc> {
             *slot = value;
             Ok(())
         } else {
-            Err(format!("Slot index {} out of bounds!", id).into())
+            Err(format!("Slot index {id} out of bounds!").into())
         }
     }
 
diff --git a/core/src/avm2/property.rs b/core/src/avm2/property.rs
index 2df4be81f..70ca45625 100644
--- a/core/src/avm2/property.rs
+++ b/core/src/avm2/property.rs
@@ -176,11 +176,11 @@ fn resolve_class_private<'gc>(
             txunit
                 .get_loaded_private_trait_script(name)
                 .ok_or_else(|| {
-                    Error::from(format!("Could not find script for class trait {:?}", name))
+                    Error::from(format!("Could not find script for class trait {name:?}"))
                 })?
                 .globals(&mut activation.context)?
         } else {
-            return Err(format!("Missing script and translation unit for class {:?}", name).into());
+            return Err(format!("Missing script and translation unit for class {name:?}").into());
         };
 
         Ok(globals
diff --git a/core/src/avm2/qname.rs b/core/src/avm2/qname.rs
index 34d8ae9b7..37cf98238 100644
--- a/core/src/avm2/qname.rs
+++ b/core/src/avm2/qname.rs
@@ -180,8 +180,8 @@ impl<'gc> QName<'gc> {
 impl<'gc> Debug for QName<'gc> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         match self.to_qualified_name_no_mc() {
-            Either::Left(name) => write!(f, "{}", name),
-            Either::Right(name) => write!(f, "{}", name),
+            Either::Left(name) => write!(f, "{name}"),
+            Either::Right(name) => write!(f, "{name}"),
         }
     }
 }
diff --git a/core/src/avm2/script.rs b/core/src/avm2/script.rs
index 78fb72cf3..8dce5aacc 100644
--- a/core/src/avm2/script.rs
+++ b/core/src/avm2/script.rs
@@ -250,7 +250,7 @@ impl<'gc> TranslationUnit<'gc> {
                 .constant_pool
                 .strings
                 .get(string_index as usize - 1)
-                .ok_or_else(|| format!("Unknown string constant {}", string_index))?,
+                .ok_or_else(|| format!("Unknown string constant {string_index}"))?,
         );
         write.strings[string_index as usize] = Some(avm_string);
 
diff --git a/core/src/avm2/value.rs b/core/src/avm2/value.rs
index c42b06fe7..5f4bee3df 100644
--- a/core/src/avm2/value.rs
+++ b/core/src/avm2/value.rs
@@ -543,7 +543,7 @@ impl<'gc> Value<'gc> {
             Value::Object(ns) => ns
                 .as_namespace()
                 .ok_or_else(|| "Expected Namespace, found Object".into()),
-            _ => Err(format!("Expected Namespace, found {:?}", self).into()),
+            _ => Err(format!("Expected Namespace, found {self:?}").into()),
         }
     }
 
@@ -562,11 +562,11 @@ impl<'gc> Value<'gc> {
             Value::Object(num) => match num.value_of(mc)? {
                 Value::Number(num) => Ok(num),
                 Value::Integer(num) => Ok(num as f64),
-                _ => Err(format!("Expected Number, int, or uint, found {:?}", self).into()),
+                _ => Err(format!("Expected Number, int, or uint, found {self:?}").into()),
             },
             Value::Number(num) => Ok(*num),
             Value::Integer(num) => Ok(*num as f64),
-            _ => Err(format!("Expected Number, int, or uint, found {:?}", self).into()),
+            _ => Err(format!("Expected Number, int, or uint, found {self:?}").into()),
         }
     }
 
@@ -817,7 +817,7 @@ impl<'gc> Value<'gc> {
     ) -> Result<AvmString<'gc>, Error<'gc>> {
         Ok(match self {
             Value::String(s) => {
-                AvmString::new_utf8(activation.context.gc_context, format!("\"{}\"", s))
+                AvmString::new_utf8(activation.context.gc_context, format!("\"{s}\""))
             }
             Value::Object(_) => self
                 .coerce_to_primitive(Some(Hint::String), activation)?
@@ -986,7 +986,7 @@ impl<'gc> Value<'gc> {
 
         let name = class.inner_class_definition().read().name();
 
-        Err(format!("Cannot coerce {:?} to an {:?}", self, name).into())
+        Err(format!("Cannot coerce {self:?} to an {name:?}").into())
     }
 
     /// Determine if this value is any kind of number.
diff --git a/core/src/bitmap/bitmap_data.rs b/core/src/bitmap/bitmap_data.rs
index 46eb31ed1..59f644041 100644
--- a/core/src/bitmap/bitmap_data.rs
+++ b/core/src/bitmap/bitmap_data.rs
@@ -1056,7 +1056,7 @@ impl<'gc> BitmapData<'gc> {
             Err(ruffle_render::error::Error::Unimplemented) => {
                 log::warn!("BitmapData.draw: Not yet implemented")
             }
-            Err(e) => panic!("BitmapData.draw failed: {:?}", e),
+            Err(e) => panic!("BitmapData.draw failed: {e:?}"),
         }
     }
 }
diff --git a/core/src/display_object.rs b/core/src/display_object.rs
index c70e77628..a714285ba 100644
--- a/core/src/display_object.rs
+++ b/core/src/display_object.rs
@@ -938,7 +938,7 @@ pub trait TDisplayObject<'gc>:
                     WString::new()
                 } else {
                     // Other levels do append their name.
-                    WString::from_utf8_owned(format!("_level{}", level))
+                    WString::from_utf8_owned(format!("_level{level}"))
                 }
             }
         }
diff --git a/core/src/player.rs b/core/src/player.rs
index 423f7d690..c0ce59ee6 100644
--- a/core/src/player.rs
+++ b/core/src/player.rs
@@ -835,8 +835,8 @@ impl Player {
                             let level = display_object.depth();
                             let object = display_object.object().coerce_to_object(&mut activation);
                             dumper.print_variables(
-                                &format!("Level #{}:", level),
-                                &format!("_level{}", level),
+                                &format!("Level #{level}:"),
+                                &format!("_level{level}"),
                                 &object,
                                 &mut activation,
                             );
diff --git a/desktop/src/main.rs b/desktop/src/main.rs
index 17c08d705..6188786b3 100644
--- a/desktop/src/main.rs
+++ b/desktop/src/main.rs
@@ -168,7 +168,7 @@ fn load_movie(url: &Url, opt: &Opt) -> Result<SwfMovie, Error> {
         let client = builder.build().context("Couldn't create HTTP client")?;
         let response = client
             .get(url.to_string())
-            .with_context(|| format!("Couldn't load URL {}", url))?;
+            .with_context(|| format!("Couldn't load URL {url}"))?;
         let mut buffer: Vec<u8> = Vec::new();
         response
             .into_body()
@@ -218,7 +218,7 @@ impl App {
                 .and_then(|segments| segments.last())
                 .unwrap_or_else(|| movie_url.as_str());
 
-            format!("Ruffle - {}", filename)
+            format!("Ruffle - {filename}")
         } else {
             "Ruffle".into()
         };
@@ -824,7 +824,7 @@ fn run_timedemo(opt: Opt) -> Result<(), Error> {
     let end = Instant::now();
     let duration = end.duration_since(start);
 
-    println!("Ran {} frames in {}s.", num_frames, duration.as_secs_f32());
+    println!("Ran {num_frames} frames in {}s.", duration.as_secs_f32());
 
     Ok(())
 }
@@ -851,7 +851,7 @@ fn init() {
 fn panic_hook() {
     CALLSTACK.with(|callstack| {
         if let Some(callstack) = &*callstack.borrow() {
-            callstack.avm2(|callstack| println!("AVM2 stack trace: {}", callstack))
+            callstack.avm2(|callstack| println!("AVM2 stack trace: {callstack}"))
         }
     });
 }
diff --git a/desktop/src/navigator.rs b/desktop/src/navigator.rs
index 291931685..60c0c0465 100644
--- a/desktop/src/navigator.rs
+++ b/desktop/src/navigator.rs
@@ -120,7 +120,7 @@ impl NavigatorBackend for ExternalNavigatorBackend {
         let full_url = match self.base_url.join(request.url()) {
             Ok(url) => url,
             Err(e) => {
-                let msg = format!("Invalid URL {}: {}", request.url(), e);
+                let msg = format!("Invalid URL {}: {e}", request.url());
                 return Box::pin(async move { Err(Error::FetchError(msg)) });
             }
         };
diff --git a/desktop/src/storage.rs b/desktop/src/storage.rs
index fbe19aa49..2d2505334 100644
--- a/desktop/src/storage.rs
+++ b/desktop/src/storage.rs
@@ -34,7 +34,7 @@ impl DiskStorageBackend {
     }
 
     fn get_shared_object_path(&self, name: &str) -> PathBuf {
-        self.shared_objects_path.join(format!("{}.sol", name))
+        self.shared_objects_path.join(format!("{name}.sol"))
     }
 
     fn get_back_compat_shared_object_path(&self, name: &str) -> PathBuf {
diff --git a/exporter/src/main.rs b/exporter/src/main.rs
index 2064b4243..baf8c266a 100644
--- a/exporter/src/main.rs
+++ b/exporter/src/main.rs
@@ -243,7 +243,7 @@ fn capture_single_swf(descriptors: Arc<Descriptors>, opt: &Opt) -> Result<()> {
     } else {
         for (frame, image) in frames.iter().enumerate() {
             let mut path: PathBuf = (&output).into();
-            path.push(format!("{}.png", frame));
+            path.push(format!("{frame}.png"));
             image.save(&path)?;
         }
     }
@@ -266,7 +266,7 @@ fn capture_single_swf(descriptors: Arc<Descriptors>, opt: &Opt) -> Result<()> {
     if let Some(progress) = progress {
         progress.finish_with_message(message);
     } else {
-        println!("{}", message);
+        println!("{message}");
     }
 
     Ok(())
@@ -331,7 +331,7 @@ fn capture_multiple_swfs(descriptors: Arc<Descriptors>, opt: &Opt) -> Result<()>
                 let _ = create_dir_all(&parent);
                 for (frame, image) in frames.iter().enumerate() {
                     let mut destination = parent.clone();
-                    destination.push(format!("{}.png", frame));
+                    destination.push(format!("{frame}.png"));
                     image.save(&destination)?;
                 }
             }
@@ -358,7 +358,7 @@ fn capture_multiple_swfs(descriptors: Arc<Descriptors>, opt: &Opt) -> Result<()>
     if let Some(progress) = progress {
         progress.finish_with_message(message);
     } else {
-        println!("{}", message);
+        println!("{message}");
     }
 
     Ok(())
diff --git a/render/canvas/src/lib.rs b/render/canvas/src/lib.rs
index 734280d6b..95416a4aa 100644
--- a/render/canvas/src/lib.rs
+++ b/render/canvas/src/lib.rs
@@ -67,7 +67,7 @@ impl CanvasColor {
         let g = (*g as f32 * cxform.g_mult.to_f32() + (cxform.g_add as f32)) as u8;
         let b = (*b as f32 * cxform.b_mult.to_f32() + (cxform.b_add as f32)) as u8;
         let a = (*a as f32 * cxform.a_mult.to_f32() + (cxform.a_add as f32)) as u8;
-        let colstring = format!("rgba({},{},{},{})", r, g, b, f32::from(a) / 255.0);
+        let colstring = format!("rgba({r},{g},{b},{})", f32::from(a) / 255.0);
         Self(colstring, r, g, b, a)
     }
 }
diff --git a/render/naga-agal/src/builder.rs b/render/naga-agal/src/builder.rs
index 806b30de3..223c907f3 100644
--- a/render/naga-agal/src/builder.rs
+++ b/render/naga-agal/src/builder.rs
@@ -380,7 +380,7 @@ impl<'a> NagaBuilder<'a> {
                     // and return them at the end of the function.
                     let local = self.func.local_variables.append(
                         LocalVariable {
-                            name: Some(format!("varying_{}", index)),
+                            name: Some(format!("varying_{index}")),
                             ty: self.vec4f,
                             init: None,
                         },
@@ -398,7 +398,7 @@ impl<'a> NagaBuilder<'a> {
 
                     if let TypeInner::Struct { members, .. } = &mut self.return_type.inner {
                         members.push(StructMember {
-                            name: Some(format!("varying_{}", index)),
+                            name: Some(format!("varying_{index}")),
                             ty: self.vec4f,
                             binding: Some(Binding::Location {
                                 location: index as u32,
diff --git a/render/naga-agal/tests/wgsl.rs b/render/naga-agal/tests/wgsl.rs
index 79aa66e80..dc445b109 100644
--- a/render/naga-agal/tests/wgsl.rs
+++ b/render/naga-agal/tests/wgsl.rs
@@ -10,7 +10,7 @@ pub fn to_wgsl(module: &Module) -> String {
     let mut validator = Validator::new(ValidationFlags::all(), Capabilities::all());
     let module_info = validator
         .validate(module)
-        .unwrap_or_else(|e| panic!("Validation failed: {}", e));
+        .unwrap_or_else(|e| panic!("Validation failed: {e}"));
 
     let mut writer =
         naga::back::wgsl::Writer::new(&mut out, naga::back::wgsl::WriterFlags::EXPLICIT_TYPES);
diff --git a/render/wgpu/src/backend.rs b/render/wgpu/src/backend.rs
index 08f837e98..2697f88ce 100644
--- a/render/wgpu/src/backend.rs
+++ b/render/wgpu/src/backend.rs
@@ -399,7 +399,7 @@ impl<T: RenderTarget + 'static> RenderBackend for WgpuRenderBackend<T> {
             )
             .is_some()
         {
-            panic!("Overwrote existing bitmap {:?}", handle);
+            panic!("Overwrote existing bitmap {handle:?}");
         }
 
         Ok(handle)
diff --git a/scanner/src/analyze.rs b/scanner/src/analyze.rs
index 8ea0d98c6..8ca3102be 100644
--- a/scanner/src/analyze.rs
+++ b/scanner/src/analyze.rs
@@ -28,7 +28,7 @@ pub fn analyze(results: impl Iterator<Item = FileResults>) {
         }
     }
 
-    println!("Scanned {} swf files.", total);
+    println!("Scanned {total} swf files.");
 
     let digits = max(
         (start as f64).log10().ceil() as usize,
@@ -67,7 +67,7 @@ pub fn analyze(results: impl Iterator<Item = FileResults>) {
         decompress,
         digits = digits
     );
-    println!("{:>digits$} movies failed to parse", parse, digits = digits);
+    println!("{parse:>digits$} movies failed to parse");
     println!(
         "{:>digits$} movies failed to execute",
         execute,
@@ -91,7 +91,7 @@ pub fn analyze_main(opt: AnalyzeOpt) -> Result<(), std::io::Error> {
             Err(e) => {
                 // Treat unparseable CSV rows as a scanner panic
                 FileResults {
-                    error: Some(format!("{}", e)),
+                    error: Some(format!("{e}")),
                     ..FileResults::default()
                 }
             }
diff --git a/scanner/src/execute.rs b/scanner/src/execute.rs
index 3d0d793d0..2cc37d492 100644
--- a/scanner/src/execute.rs
+++ b/scanner/src/execute.rs
@@ -79,7 +79,7 @@ pub fn execute_report_main(execute_report_opt: ExecuteReportOpt) -> Result<(), s
     let data = match std::fs::read(&file_path) {
         Ok(data) => data,
         Err(e) => {
-            file_result.error = Some(format!("File error: {}", e));
+            file_result.error = Some(format!("File error: {e}"));
             checkpoint(&mut file_result, &start, &mut writer)?;
 
             return Ok(());
@@ -119,7 +119,7 @@ pub fn execute_report_main(execute_report_opt: ExecuteReportOpt) -> Result<(), s
                 file_result.uncompressed_len = Some(swf.header.uncompressed_len());
                 file_result.compression = Some(swf.header.compression().into());
                 file_result.version = Some(swf.header.version());
-                file_result.stage_size = Some(format!("{}x{}", stage_width, stage_height));
+                file_result.stage_size = Some(format!("{stage_width}x{stage_height}"));
                 file_result.frame_rate = Some(swf.header.frame_rate().into());
                 file_result.num_frames = Some(swf.header.num_frames());
                 file_result.use_direct_blit = Some(swf.header.use_direct_blit());
@@ -131,13 +131,13 @@ pub fn execute_report_main(execute_report_opt: ExecuteReportOpt) -> Result<(), s
                 });
             }
             Err(e) => {
-                file_result.error = Some(format!("Parse error: {}", e));
+                file_result.error = Some(format!("Parse error: {e}"));
                 checkpoint(&mut file_result, &start, &mut writer)?;
             }
         },
         Err(e) => match e.downcast::<String>() {
             Ok(e) => {
-                file_result.error = Some(format!("PANIC: {}", e));
+                file_result.error = Some(format!("PANIC: {e}"));
                 checkpoint(&mut file_result, &start, &mut writer)?;
             }
             Err(_) => {
@@ -154,7 +154,7 @@ pub fn execute_report_main(execute_report_opt: ExecuteReportOpt) -> Result<(), s
     if let Err(e) = catch_unwind(|| execute_swf(&file_path)) {
         match e.downcast::<String>() {
             Ok(e) => {
-                file_result.error = Some(format!("PANIC: {}", e));
+                file_result.error = Some(format!("PANIC: {e}"));
                 checkpoint(&mut file_result, &start, &mut writer)?;
             }
             Err(_) => {
diff --git a/scanner/src/file_results.rs b/scanner/src/file_results.rs
index d34532199..71224df8b 100644
--- a/scanner/src/file_results.rs
+++ b/scanner/src/file_results.rs
@@ -164,7 +164,7 @@ where
 {
     let mut out = String::with_capacity(2 * hash.len());
     for byte in hash {
-        write!(out, "{:02X}", byte).map_err(|e| SerError::custom(e.to_string()))?;
+        write!(out, "{byte:02X}").map_err(|e| SerError::custom(e.to_string()))?;
     }
 
     s.serialize_str(&out)
diff --git a/scanner/src/scan.rs b/scanner/src/scan.rs
index ffcb0aeb8..73ce82ad1 100644
--- a/scanner/src/scan.rs
+++ b/scanner/src/scan.rs
@@ -97,7 +97,7 @@ pub fn scan_file<P: AsRef<OsStr>>(exec_path: P, file: &DirEntry, name: &str) ->
                 file_results.error = Some(
                     file_results
                         .error
-                        .map(|e| format!("{}\n{}", e, panic_error))
+                        .map(|e| format!("{e}\n{panic_error}"))
                         .unwrap_or(panic_error),
                 );
             }
@@ -145,7 +145,7 @@ pub fn scan_main(opt: ScanOpt) -> Result<(), std::io::Error> {
         .ser_bridge()
         .map(|result| {
             if let Err(e) = writer.serialize(result.clone()) {
-                eprintln!("{}", e);
+                eprintln!("{e}");
             };
 
             result
diff --git a/swf/src/avm1/opcode.rs b/swf/src/avm1/opcode.rs
index 191e02127..3b409cf12 100644
--- a/swf/src/avm1/opcode.rs
+++ b/swf/src/avm1/opcode.rs
@@ -123,9 +123,9 @@ impl OpCode {
 
     pub fn format(opcode: u8) -> String {
         if let Some(op) = Self::from_u8(opcode) {
-            format!("{:?}", op)
+            format!("{op:?}")
         } else {
-            format!("Unknown({})", opcode)
+            format!("Unknown({opcode})")
         }
     }
 }
diff --git a/swf/src/avm1/read.rs b/swf/src/avm1/read.rs
index a67505f38..e9e512345 100644
--- a/swf/src/avm1/read.rs
+++ b/swf/src/avm1/read.rs
@@ -430,7 +430,7 @@ pub mod tests {
         match reader.read_action() {
             Err(crate::error::Error::Avm1ParseError { .. }) => (),
             result => {
-                panic!("Expected Avm1ParseError, got {:?}", result);
+                panic!("Expected Avm1ParseError, got {result:?}");
             }
         }
     }
diff --git a/swf/src/avm2/read.rs b/swf/src/avm2/read.rs
index ac66a84cb..b222dbf37 100644
--- a/swf/src/avm2/read.rs
+++ b/swf/src/avm2/read.rs
@@ -888,7 +888,7 @@ pub mod tests {
                 return do_abc.data.to_vec();
             }
         }
-        panic!("ABC tag not found in {}", path);
+        panic!("ABC tag not found in {path}");
     }
 
     #[test]
diff --git a/swf/src/error.rs b/swf/src/error.rs
index f21039560..fb8a07f97 100644
--- a/swf/src/error.rs
+++ b/swf/src/error.rs
@@ -78,7 +78,7 @@ impl fmt::Display for Error {
             Self::Avm1ParseError { opcode, source } => {
                 write!(f, "Error parsing AVM1 action {}", OpCode::format(*opcode))?;
                 if let Some(source) = source {
-                    write!(f, ": {}", source)?;
+                    write!(f, ": {source}")?;
                 }
                 Ok(())
             }
@@ -91,8 +91,8 @@ impl fmt::Display for Error {
                 )
             }
             Self::IoError(e) => e.fmt(f),
-            Self::InvalidData(message) => write!(f, "Invalid data: {}", message),
-            Self::Unsupported(message) => write!(f, "Unsupported data: {}", message),
+            Self::InvalidData(message) => write!(f, "Invalid data: {message}"),
+            Self::Unsupported(message) => write!(f, "Unsupported data: {message}"),
         }
     }
 }
diff --git a/swf/src/read.rs b/swf/src/read.rs
index c57afcb99..ce493655c 100644
--- a/swf/src/read.rs
+++ b/swf/src/read.rs
@@ -3016,7 +3016,7 @@ pub mod tests {
             let mut reader = Reader::new(&tag_bytes[..], swf_version);
             let parsed_tag = match reader.read_tag() {
                 Ok(tag) => tag,
-                Err(e) => panic!("Error parsing tag: {}", e),
+                Err(e) => panic!("Error parsing tag: {e}"),
             };
             assert_eq!(
                 parsed_tag, expected_tag,
@@ -3049,7 +3049,7 @@ pub mod tests {
         match reader.read_tag() {
             Err(crate::error::Error::SwfParseError { .. }) => (),
             result => {
-                panic!("Expected SwfParseError, got {:?}", result);
+                panic!("Expected SwfParseError, got {result:?}");
             }
         }
     }
diff --git a/swf/src/tag_code.rs b/swf/src/tag_code.rs
index 2d9dfc1a2..f6d58e23c 100644
--- a/swf/src/tag_code.rs
+++ b/swf/src/tag_code.rs
@@ -95,9 +95,9 @@ impl TagCode {
 
     pub fn format(tag_code: u16) -> String {
         if let Some(tag_code) = TagCode::from_u16(tag_code) {
-            format!("{:?}", tag_code)
+            format!("{tag_code:?}")
         } else {
-            format!("Unknown({})", tag_code)
+            format!("Unknown({tag_code})")
         }
     }
 }
diff --git a/tests/tests/regression_tests.rs b/tests/tests/regression_tests.rs
index 8b2b8b02f..f5febeba0 100644
--- a/tests/tests/regression_tests.rs
+++ b/tests/tests/regression_tests.rs
@@ -1510,15 +1510,15 @@ fn run_swf(
             }
             Err(e) => {
                 eprintln!(
-                    "Failed to open expected image {:?}: {:?}",
-                    &expected_image_path, e
+                    "Failed to open expected image {:?}: {e:?}",
+                    &expected_image_path
                 );
                 false
             }
         };
 
         if !matches {
-            let actual_image_path = base_path.join(format!("actual-{}.png", suffix));
+            let actual_image_path = base_path.join(format!("actual-{suffix}.png"));
             actual_image.save_with_format(&actual_image_path, image::ImageFormat::Png)?;
             panic!(
                 "Test output does not match expected image - saved actual image to {:?}",
@@ -1561,7 +1561,7 @@ impl ExternalInterfaceTestProvider {
 }
 
 fn do_trace(context: &mut UpdateContext<'_, '_, '_>, args: &[ExternalValue]) -> ExternalValue {
-    context.avm_trace(&format!("[ExternalInterface] trace: {:?}", args));
+    context.avm_trace(&format!("[ExternalInterface] trace: {args:?}"));
     "Traced!".into()
 }
 
diff --git a/web/src/lib.rs b/web/src/lib.rs
index e3e82e801..399dd0a6f 100644
--- a/web/src/lib.rs
+++ b/web/src/lib.rs
@@ -186,7 +186,7 @@ impl Ruffle {
     pub fn new(parent: HtmlElement, js_player: JavascriptPlayer, config: JsValue) -> Promise {
         wasm_bindgen_futures::future_to_promise(async move {
             let config: Config = serde_wasm_bindgen::from_value(config)
-                .map_err(|e| format!("Error parsing config: {}", e))?;
+                .map_err(|e| format!("Error parsing config: {e}"))?;
 
             if RUFFLE_GLOBAL_PANIC.is_completed() {
                 // If an actual panic happened, then we can't trust the state it left us in.
@@ -224,7 +224,7 @@ impl Ruffle {
     /// This method should only be called once per player.
     pub fn load_data(&mut self, swf_data: Uint8Array, parameters: JsValue) -> Result<(), JsValue> {
         let mut movie = SwfMovie::from_data(&swf_data.to_vec(), None, None)
-            .map_err(|e| format!("Error loading movie: {}", e))?;
+            .map_err(|e| format!("Error loading movie: {e}"))?;
         movie.append_parameters(parse_movie_parameters(&parameters));
 
         self.on_metadata(movie.header());
diff --git a/web/src/navigator.rs b/web/src/navigator.rs
index 8cb31e734..dfb48457e 100644
--- a/web/src/navigator.rs
+++ b/web/src/navigator.rs
@@ -186,7 +186,7 @@ impl NavigatorBackend for WebNavigatorBackend {
             }
 
             let request = WebRequest::new_with_str_and_init(&url, &init)
-                .map_err(|_| Error::FetchError(format!("Unable to create request for {}", url)))?;
+                .map_err(|_| Error::FetchError(format!("Unable to create request for {url}")))?;
 
             let window = web_sys::window().expect("window()");
             let fetchval = JsFuture::from(window.fetch_with_request(&request))
diff --git a/wstr/src/tests.rs b/wstr/src/tests.rs
index 9e1ff8d8a..8e2bcb9c5 100644
--- a/wstr/src/tests.rs
+++ b/wstr/src/tests.rs
@@ -28,7 +28,7 @@ fn roundtrip() {
             _ => false,
         };
 
-        assert!(eq, "expected {:?}, got {:?}", units, conv);
+        assert!(eq, "expected {units:?}, got {conv:?}");
     }
 
     test(b"");
@@ -76,15 +76,15 @@ fn fmt() {
     let c = bstr!(b"\t\n\x03");
     let d = wstr!(0x202d 0x202e);
 
-    assert_eq!(format!("{}", a), "Hello world!");
-    assert_eq!(format!("{}", b), "Hello world!");
-    assert_eq!(format!("{}", c), "\t\n\x03");
-    assert_eq!(format!("{}", d), "\u{202d}\u{202e}");
+    assert_eq!(format!("{a}"), "Hello world!");
+    assert_eq!(format!("{b}"), "Hello world!");
+    assert_eq!(format!("{c}"), "\t\n\x03");
+    assert_eq!(format!("{d}"), "\u{202d}\u{202e}");
 
-    assert_eq!(format!("{:?}", a), "\"Hello world!\"");
-    assert_eq!(format!("{:?}", b), "\"Hello world!\"");
-    assert_eq!(format!("{:?}", c), "\"\\t\\n\\u{3}\"");
-    assert_eq!(format!("{:?}", d), "\"\\u{202d}\\u{202e}\"");
+    assert_eq!(format!("{a:?}"), "\"Hello world!\"");
+    assert_eq!(format!("{b:?}"), "\"Hello world!\"");
+    assert_eq!(format!("{c:?}"), "\"\\t\\n\\u{3}\"");
+    assert_eq!(format!("{d:?}"), "\"\\u{202d}\\u{202e}\"");
 }
 
 #[test]