diff --git a/ci/svd2rust-regress/src/main.rs b/ci/svd2rust-regress/src/main.rs
index 0e0eb09a..4d32f1ac 100644
--- a/ci/svd2rust-regress/src/main.rs
+++ b/ci/svd2rust-regress/src/main.rs
@@ -154,19 +154,16 @@ pub struct Test {
 impl Test {
     fn run(&self, opts: &Opts) -> Result<(), anyhow::Error> {
         match self {
-            Self { url: Some(url), .. } => {}
+            Self { url: Some(_), .. } => {}
             Self {
-                svd_file: Some(svd_file),
-                ..
-            } => {}
-            Self {
-                chip: Some(chip), ..
+                svd_file: Some(_), ..
             } => {}
+            Self { chip: Some(_), .. } => {}
             _ => unreachable!("clap should not allow this"),
         }
         let test = if let (Some(url), Some(arch)) = (&self.url, &self.arch) {
             tests::TestCase {
-                arch: svd2rust::Target::parse(&arch)?,
+                arch: svd2rust::Target::parse(arch)?,
                 mfgr: tests::Manufacturer::Unknown,
                 chip: self
                     .chip
diff --git a/ci/svd2rust-regress/src/svd_test.rs b/ci/svd2rust-regress/src/svd_test.rs
index 5ac8bbd9..13bb6648 100644
--- a/ci/svd2rust-regress/src/svd_test.rs
+++ b/ci/svd2rust-regress/src/svd_test.rs
@@ -1,7 +1,7 @@
 use anyhow::{anyhow, Context, Result};
 use svd2rust::{util::Case, Target};
 
-use crate::{command::CommandExt, tests::TestCase, Opts, TestAll};
+use crate::{command::CommandExt, tests::TestCase, Opts};
 use std::io::prelude::*;
 use std::path::PathBuf;
 use std::process::Command;
diff --git a/src/generate/device.rs b/src/generate/device.rs
index fc87fef2..25d6bdd2 100644
--- a/src/generate/device.rs
+++ b/src/generate/device.rs
@@ -236,8 +236,8 @@ pub fn render(d: &Device, config: &Config, device_x: &mut String) -> Result<Toke
             Peripheral::Single(_p) => {
                 let p_name = util::name_of(p, config.ignore_groups);
                 let p_feature = feature_format.apply(&p_name);
-                let p_ty = ident(&p_name, &config, "peripheral", span);
-                let p_singleton = ident(&p_name, &config, "peripheral_singleton", span);
+                let p_ty = ident(&p_name, config, "peripheral", span);
+                let p_singleton = ident(&p_name, config, "peripheral_singleton", span);
                 if config.feature_peripheral {
                     feature_attribute.extend(quote! { #[cfg(feature = #p_feature)] })
                 };
@@ -253,8 +253,8 @@ pub fn render(d: &Device, config: &Config, device_x: &mut String) -> Result<Toke
             Peripheral::Array(p, dim_element) => {
                 for p_name in names(p, dim_element) {
                     let p_feature = feature_format.apply(&p_name);
-                    let p_ty = ident(&p_name, &config, "peripheral", span);
-                    let p_singleton = ident(&p_name, &config, "peripheral_singleton", span);
+                    let p_ty = ident(&p_name, config, "peripheral", span);
+                    let p_singleton = ident(&p_name, config, "peripheral_singleton", span);
                     if config.feature_peripheral {
                         feature_attribute.extend(quote! { #[cfg(feature = #p_feature)] })
                     };
diff --git a/src/generate/interrupt.rs b/src/generate/interrupt.rs
index 1c48b06e..10d9bdde 100644
--- a/src/generate/interrupt.rs
+++ b/src/generate/interrupt.rs
@@ -55,7 +55,7 @@ pub fn render(
         }
         pos += 1;
 
-        let i_ty = ident(&interrupt.0.name, &config, "interrupt", span);
+        let i_ty = ident(&interrupt.0.name, config, "interrupt", span);
         let description = format!(
             "{} - {}",
             interrupt.0.value,
diff --git a/src/generate/peripheral.rs b/src/generate/peripheral.rs
index bc4c3fc3..34f421c6 100644
--- a/src/generate/peripheral.rs
+++ b/src/generate/peripheral.rs
@@ -37,7 +37,7 @@ pub fn render(p_original: &Peripheral, index: &Index, config: &Config) -> Result
 
     let name = util::name_of(&p, config.ignore_groups);
     let span = Span::call_site();
-    let p_ty = ident(&name, &config, "peripheral", span);
+    let p_ty = ident(&name, config, "peripheral", span);
     let name_str = p_ty.to_string();
     let address = util::hex(p.base_address + config.base_address_shift);
     let description = util::respace(p.description.as_ref().unwrap_or(&p.name));
@@ -85,7 +85,7 @@ pub fn render(p_original: &Peripheral, index: &Index, config: &Config) -> Result
             for pi in svd::peripheral::expand(p, dim) {
                 let name = &pi.name;
                 let description = pi.description.as_deref().unwrap_or(&p.name);
-                let p_ty = ident(name, &config, "peripheral", span);
+                let p_ty = ident(name, config, "peripheral", span);
                 let name_str = p_ty.to_string();
                 let doc_alias = (&name_str != name).then(|| quote!(#[doc(alias = #name)]));
                 let address = util::hex(pi.base_address + config.base_address_shift);
@@ -640,8 +640,8 @@ fn register_or_cluster_block(
 
     let mut doc_alias = None;
     let block_ty = if let Some(name) = name {
-        let ty = ident(name, &config, "cluster", span);
-        if ty.to_string() != name {
+        let ty = ident(name, config, "cluster", span);
+        if ty != name {
             doc_alias = Some(quote!(#[doc(alias = #name)]));
         }
         ty
@@ -996,12 +996,12 @@ fn expand_cluster(cluster: &Cluster, config: &Config) -> Result<Vec<RegisterBloc
         util::replace_suffix(&cluster.name, "")
     };
     let span = Span::call_site();
-    let ty = name_to_ty(ident(&ty_name, &config, "cluster", span));
+    let ty = name_to_ty(ident(&ty_name, config, "cluster", span));
 
     match cluster {
         Cluster::Single(info) => {
             let doc = make_comment(cluster_size, info.address_offset, &description);
-            let name: Ident = ident(&info.name, &config, "cluster_accessor", span);
+            let name: Ident = ident(&info.name, config, "cluster_accessor", span);
             let syn_field = new_syn_field(name.clone(), ty.clone());
             cluster_expanded.push(RegisterBlockField {
                 syn_field,
@@ -1050,7 +1050,7 @@ fn expand_cluster(cluster: &Cluster, config: &Config) -> Result<Vec<RegisterBloc
                     } else {
                         &ty_name
                     },
-                    &config,
+                    config,
                     "cluster_accessor",
                     span,
                 );
@@ -1083,7 +1083,7 @@ fn expand_cluster(cluster: &Cluster, config: &Config) -> Result<Vec<RegisterBloc
                 });
                 if !sequential_indexes_from0 || !ends_with_index {
                     for (i, ci) in svd::cluster::expand(info, array_info).enumerate() {
-                        let idx_name = ident(&ci.name, &config, "cluster_accessor", span);
+                        let idx_name = ident(&ci.name, config, "cluster_accessor", span);
                         let doc = make_comment(
                             cluster_size,
                             ci.address_offset,
@@ -1125,7 +1125,7 @@ fn expand_cluster(cluster: &Cluster, config: &Config) -> Result<Vec<RegisterBloc
                         ci.address_offset,
                         ci.description.as_deref().unwrap_or(&ci.name),
                     );
-                    let name = ident(&ci.name, &config, "cluster_accessor", span);
+                    let name = ident(&ci.name, config, "cluster_accessor", span);
                     let syn_field = new_syn_field(name.clone(), ty.clone());
 
                     cluster_expanded.push(RegisterBlockField {
@@ -1176,8 +1176,8 @@ fn expand_register(
         Register::Single(info) => {
             let doc = make_comment(register_size, info.address_offset, &description);
             let span = Span::call_site();
-            let ty = name_to_ty(ident(&ty_str, &config, "register", span));
-            let name: Ident = ident(&ty_name, &config, "register_accessor", span);
+            let ty = name_to_ty(ident(&ty_str, config, "register", span));
+            let name: Ident = ident(&ty_name, config, "register_accessor", span);
             let syn_field = new_syn_field(name.clone(), ty.clone());
             register_expanded.push(RegisterBlockField {
                 syn_field,
@@ -1232,18 +1232,18 @@ fn expand_register(
             let array_convertible = ac && sequential_addresses;
             let array_proxy_convertible = ac && disjoint_sequential_addresses;
             let span = Span::call_site();
-            let ty = name_to_ty(ident(&ty_str, &config, "register", span));
+            let ty = name_to_ty(ident(&ty_str, config, "register", span));
 
             if array_convertible || array_proxy_convertible {
                 let accessor_name = if let Some(dim_name) = array_info.dim_name.as_ref() {
                     ident(
                         &util::fullname(dim_name, &info.alternate_group, config.ignore_groups),
-                        &config,
+                        config,
                         "register_accessor",
                         span,
                     )
                 } else {
-                    ident(&ty_name, &config, "register_accessor", span)
+                    ident(&ty_name, config, "register_accessor", span)
                 };
                 let doc = make_comment(
                     register_size * array_info.dim,
@@ -1276,7 +1276,7 @@ fn expand_register(
                     for (i, ri) in svd::register::expand(info, array_info).enumerate() {
                         let idx_name = ident(
                             &util::fullname(&ri.name, &info.alternate_group, config.ignore_groups),
-                            &config,
+                            config,
                             "cluster_accessor",
                             span,
                         );
@@ -1321,7 +1321,7 @@ fn expand_register(
                         info.address_offset,
                         ri.description.as_deref().unwrap_or(&ri.name),
                     );
-                    let name = ident(&ri.name, &config, "register_accessor", span);
+                    let name = ident(&ri.name, config, "register_accessor", span);
                     let syn_field = new_syn_field(name.clone(), ty.clone());
 
                     register_expanded.push(RegisterBlockField {
@@ -1404,7 +1404,7 @@ fn cluster_block(
     // name_snake_case needs to take into account array type.
     let span = Span::call_site();
     let mod_ty = ident(&mod_name, config, "cluster_mod", span);
-    let block_ty = ident(&mod_name, &config, "cluster", span);
+    let block_ty = ident(&mod_name, config, "cluster", span);
 
     if let Some(dpath) = dpath {
         let dparent = dpath.parent().unwrap();
@@ -1418,7 +1418,7 @@ fn cluster_block(
         derived
             .path
             .segments
-            .push(path_segment(ident(&dname, &config, "cluster", span)));
+            .push(path_segment(ident(&dname, config, "cluster", span)));
         mod_derived
             .path
             .segments
diff --git a/src/generate/register.rs b/src/generate/register.rs
index 9bfddf30..bf078785 100644
--- a/src/generate/register.rs
+++ b/src/generate/register.rs
@@ -22,7 +22,7 @@ use anyhow::{anyhow, Result};
 use syn::punctuated::Punctuated;
 
 fn regspec(name: &str, config: &Config, span: Span) -> Ident {
-    ident(name, &config, "register_spec", span)
+    ident(name, config, "register_spec", span)
 }
 
 fn field_accessor(name: &str, config: &Config, span: Span) -> Ident {
@@ -60,8 +60,8 @@ pub fn render(
         }
     }
     let span = Span::call_site();
-    let reg_ty = ident(&name, &config, "register", span);
-    let doc_alias = (&reg_ty.to_string() != &name).then(|| quote!(#[doc(alias = #name)]));
+    let reg_ty = ident(&name, config, "register", span);
+    let doc_alias = (reg_ty.to_string().as_str() != name).then(|| quote!(#[doc(alias = #name)]));
     let mod_ty = ident(&name, config, "register_mod", span);
     let description = util::escape_special_chars(
         util::respace(&register.description.clone().unwrap_or_else(|| {
@@ -82,7 +82,7 @@ pub fn render(
         derived
             .path
             .segments
-            .push(path_segment(ident(&dname, &config, "register", span)));
+            .push(path_segment(ident(&dname, config, "register", span)));
         mod_derived
             .path
             .segments
@@ -656,7 +656,7 @@ pub fn fields(
             {
                 ident(
                     evs.name.as_deref().unwrap_or(&name),
-                    &config,
+                    config,
                     "enum_name",
                     span,
                 )
@@ -666,7 +666,7 @@ pub fn fields(
             };
 
             // name of read proxy type
-            let reader_ty = ident(&name, &config, "field_reader", span);
+            let reader_ty = ident(&name, config, "field_reader", span);
 
             // if it's enumeratedValues and it's derived from base, don't derive the read proxy
             // as the base has already dealt with this;
@@ -861,7 +861,7 @@ pub fn fields(
                 evs_r = Some(evs);
                 // generate pub use field_1 reader as field_2 reader
                 let base_field = util::replace_suffix(&base.field.name, "");
-                let base_r = ident(&base_field, &config, "field_reader", span);
+                let base_r = ident(&base_field, config, "field_reader", span);
                 if !reader_derives.contains(&reader_ty) {
                     let base_path = base_syn_path(base, &fpath, &base_r, config)?;
                     mod_items.extend(quote! {
@@ -977,14 +977,14 @@ pub fn fields(
                     } else {
                         "enum_name"
                     };
-                    ident(evs.name.as_deref().unwrap_or(&name), &config, fmt, span)
+                    ident(evs.name.as_deref().unwrap_or(&name), config, fmt, span)
                 } else {
                     // raw_field_value_write_ty
                     fty.clone()
                 };
 
             // name of write proxy type
-            let writer_ty = ident(&name, &config, "field_writer", span);
+            let writer_ty = ident(&name, config, "field_writer", span);
 
             let mut proxy_items = TokenStream::new();
             let mut unsafety = unsafety(f.write_constraint.as_ref(), width);
@@ -1136,7 +1136,7 @@ pub fn fields(
 
                 // generate pub use field_1 writer as field_2 writer
                 let base_field = util::replace_suffix(&base.field.name, "");
-                let base_w = ident(&base_field, &config, "field_writer", span);
+                let base_w = ident(&base_field, config, "field_writer", span);
                 if !writer_derives.contains(&writer_ty) {
                     let base_path = base_syn_path(base, &fpath, &base_w, config)?;
                     mod_items.extend(quote! {
@@ -1304,7 +1304,7 @@ impl Variant {
                 .description
                 .clone()
                 .unwrap_or_else(|| format!("`{value:b}`")),
-            pc: ident(&ev.name, &config, "enum_value", span),
+            pc: ident(&ev.name, config, "enum_value", span),
             is_sc,
             sc,
             value,
diff --git a/src/main.rs b/src/main.rs
index b4d02e94..029aab6a 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -39,7 +39,7 @@ fn parse_configs(app: Command) -> Result<Config> {
 
     if let Some(ident_formats) = ident_formats.get_many::<String>("ident_format") {
         for f in ident_formats {
-            let mut f = f.split(":");
+            let mut f = f.split(':');
             if let (Some(n), Some(p), Some(c), Some(s)) = (f.next(), f.next(), f.next(), f.next()) {
                 let case = match c {
                     "" | "unchanged" | "svd" => None,
@@ -335,11 +335,11 @@ Ignore this option if you are not building your own FPGA based soft-cores."),
         let mut features = Vec::new();
         if config.feature_group {
             features.extend(
-                util::group_names(&device, &feature_format)
+                util::group_names(&device, feature_format)
                     .iter()
                     .map(|s| format!("{s} = []\n")),
             );
-            let add_groups: Vec<_> = util::group_names(&device, &feature_format)
+            let add_groups: Vec<_> = util::group_names(&device, feature_format)
                 .iter()
                 .map(|s| format!("\"{s}\""))
                 .collect();
@@ -347,11 +347,11 @@ Ignore this option if you are not building your own FPGA based soft-cores."),
         }
         if config.feature_peripheral {
             features.extend(
-                util::peripheral_names(&device, &feature_format)
+                util::peripheral_names(&device, feature_format)
                     .iter()
                     .map(|s| format!("{s} = []\n")),
             );
-            let add_peripherals: Vec<_> = util::peripheral_names(&device, &feature_format)
+            let add_peripherals: Vec<_> = util::peripheral_names(&device, feature_format)
                 .iter()
                 .map(|s| format!("\"{s}\""))
                 .collect();
diff --git a/src/util.rs b/src/util.rs
index 2468084b..60eebb2a 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -33,26 +33,22 @@ fn to_pascal_case(s: &str) -> String {
         if let Some(&"") = parts.peek() {
             string.push('_');
         }
-        loop {
-            if let Some(p) = parts.next() {
-                if p.is_empty() {
-                    continue;
+        while let Some(p) = parts.next() {
+            if p.is_empty() {
+                continue;
+            }
+            string.push_str(&p.to_pascal_case());
+            match parts.peek() {
+                Some(nxt)
+                    if p.ends_with(|s: char| s.is_numeric())
+                        && nxt.starts_with(|s: char| s.is_numeric()) =>
+                {
+                    string.push('_');
                 }
-                string.push_str(&p.to_pascal_case());
-                match parts.peek() {
-                    Some(nxt)
-                        if p.ends_with(|s: char| s.is_numeric())
-                            && nxt.starts_with(|s: char| s.is_numeric()) =>
-                    {
-                        string.push('_');
-                    }
-                    Some(&"") => {
-                        string.push('_');
-                    }
-                    _ => {}
+                Some(&"") => {
+                    string.push('_');
                 }
-            } else {
-                break;
+                _ => {}
             }
         }
         string
@@ -310,7 +306,7 @@ pub fn block_path_to_ty(
         span,
     )));
     for ps in &bpath.path {
-        segments.push(path_segment(ident(&ps, config, "cluster_mod", span)));
+        segments.push(path_segment(ident(ps, config, "cluster_mod", span)));
     }
     type_path(segments)
 }