diff --git a/aya-gen/src/bindgen.rs b/aya-gen/src/bindgen.rs
index 0f6ba8ec..137c25e0 100644
--- a/aya-gen/src/bindgen.rs
+++ b/aya-gen/src/bindgen.rs
@@ -1,26 +1,22 @@
 use bindgen::{self, Builder, EnumVariation};
 
 pub fn user_builder() -> Builder {
-    let bindgen = bindgen::builder()
+    bindgen::builder()
         .layout_tests(false)
         .generate_comments(false)
         .prepend_enum_name(false)
         .default_enum_style(EnumVariation::Rust {
             non_exhaustive: false,
-        });
-
-    bindgen
+        })
 }
 
 pub fn bpf_builder() -> Builder {
-    let bindgen = bindgen::builder()
+    bindgen::builder()
         .use_core()
         .ctypes_prefix("::aya_bpf_cty")
         .layout_tests(false)
         .generate_comments(false)
         .clang_arg("-Wno-unknown-attributes")
         .default_enum_style(EnumVariation::ModuleConsts)
-        .prepend_enum_name(false);
-
-    bindgen
+        .prepend_enum_name(false)
 }
diff --git a/aya-gen/src/btf_types.rs b/aya-gen/src/btf_types.rs
index 5387ef40..e5ece897 100644
--- a/aya-gen/src/btf_types.rs
+++ b/aya-gen/src/btf_types.rs
@@ -46,8 +46,7 @@ pub fn generate<T: AsRef<str>>(
     let bpf_probe_read = syn::parse_str::<syn::Path>("::aya_bpf::helpers::bpf_probe_read").unwrap();
     let getters =
         generate_getters_for_items(&tree.items, |getter| read_getter(getter, &bpf_probe_read));
-    let getters =
-        rustfmt::format(&getters.to_string()).map_err(|io_error| Error::Rustfmt(io_error))?;
+    let getters = rustfmt::format(&getters.to_string()).map_err(Error::Rustfmt)?;
 
     let bindings = format!("{}\n{}", bindings, getters);
 
@@ -60,7 +59,7 @@ fn c_header_from_btf(path: &Path) -> Result<String, Error> {
         .arg(path)
         .args(&["format", "c"])
         .output()
-        .map_err(|io_error| Error::BpfTool(io_error))?;
+        .map_err(Error::BpfTool)?;
 
     if !output.status.success() {
         return Err(Error::BpfToolExit {
diff --git a/aya-gen/src/getters.rs b/aya-gen/src/getters.rs
index 4436e25a..8e0b45d8 100644
--- a/aya-gen/src/getters.rs
+++ b/aya-gen/src/getters.rs
@@ -60,7 +60,7 @@ impl<'a> GetterList<'a> {
                 let sub_fields = self
                     .item_fields
                     .get(field_ty_ident)
-                    .expect(&field_ty_ident.to_string())
+                    .unwrap_or_else(|| panic!("{}", field_ty_ident.to_string()))
                     .1;
                 getters.extend(self.getters(field_ident, sub_fields).drain(..).map(
                     |mut getter| {
@@ -86,7 +86,7 @@ pub fn generate_getters_for_items(
     gen_getter: impl Fn(&Getter<'_>) -> TokenStream,
 ) -> TokenStream {
     let mut tokens = TokenStream::new();
-    tokens.append_all(GetterList::new(&items).iter().map(|(item, getters)| {
+    tokens.append_all(GetterList::new(items).iter().map(|(item, getters)| {
         let getters = getters.iter().map(&gen_getter);
         let (ident, generics, _) = unpack_item(item).unwrap();
         quote! {