chore: bow to the clippy

crates/aiken-lang/src/ast.rs

@@ -718,18 +718,13 @@ impl Annotation {
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub enum Layer {
+    #[default]
     Value,
     Type,
 }
 
-impl Default for Layer {
-    fn default() -> Self {
-        Layer::Value
-    }
-}
-
 impl Layer {
     /// Returns `true` if the layer is [`Value`].
     pub fn is_value(&self) -> bool {

crates/aiken-lang/src/tipo/error.rs

@@ -792,7 +792,7 @@ Perhaps, try the following:
         suggest_neighbor(
             name,
             variables.iter(),
-            &if name.chars().into_iter().next().unwrap().is_uppercase() {
+            &if name.chars().next().unwrap().is_uppercase() {
                 suggest_import_constructor()
             } else {
                 "Did you forget to import it?".to_string()

crates/aiken-lang/src/uplc.rs

@@ -4468,7 +4468,6 @@ impl<'a> CodeGenerator<'a> {
                     | DefaultFunction::Trace => unimplemented!("{func:#?}"),
                     DefaultFunction::ChooseData => {
                         let temp_vars = (0..func.arity())
-                            .into_iter()
                             .map(|_| format!("__item_{}", self.id_gen.next()))
                             .collect_vec();