diff --git a/src/compiler.rs b/src/compiler.rs
index 5578a9b..3f1187a 100644
--- a/src/compiler.rs
+++ b/src/compiler.rs
@@ -23,7 +23,7 @@ impl<'a> Scope<'a> {
         }
     }
     fn assigned(&mut self, id: Ident) {
-        self.idents.push((id, Default::default()));
+        self.idents.push((id, Rc::default()));
     }
     fn find(&self, id: &Ident) -> Rc<Cell<u16>> {
         let mut cur = Some(self);
diff --git a/src/lexer.rs b/src/lexer.rs
index a498fba..40f48ac 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -166,6 +166,7 @@ where
     chars: Peekable<I>,
 }
 
+#[allow(clippy::unnecessary_wraps)]
 fn t(tk: Token) -> Option<Result<Token>> {
     Some(Ok(tk))
 }
@@ -203,6 +204,7 @@ where
     fn eat(&mut self) {
         self.next();
     }
+    #[allow(clippy::unnecessary_wraps)]
     fn eat_to(&mut self, tk: Token) -> Option<Result<Token>> {
         self.eat();
         Some(Ok(tk))
@@ -236,7 +238,7 @@ where
             "true" => Token::Literal(Literal::Boolean(true)),
             "false" => Token::Literal(Literal::Boolean(false)),
             "nil" => Token::Literal(Literal::Nil),
-            _ => Token::Literal(Literal::Ident(Ident(word), Default::default())),
+            _ => Token::Literal(Literal::Ident(Ident(word), Option::default())),
         }
     }
 
diff --git a/src/parser/util.rs b/src/parser/util.rs
index 68c28ff..33324da 100644
--- a/src/parser/util.rs
+++ b/src/parser/util.rs
@@ -28,7 +28,7 @@ fn fmt_expr(e: &Expr, depth: usize) -> String {
             let mut result = fmt_expr(l, depth);
             result.push('(');
             let len = r.len();
-            for (i, e) in r.into_iter().enumerate() {
+            for (i, e) in r.iter().enumerate() {
                 result.push_str(&fmt_expr(e, depth));
                 if i + 1 != len {
                     result.push_str(", ");
@@ -62,7 +62,7 @@ fn fmt_expr(e: &Expr, depth: usize) -> String {
         }
         Expr::Func(a, e) => format!(
             "(func({}) ({}))",
-            a.into_iter()
+            a.iter()
                 .map(|e| fmt_expr(e, depth))
                 .collect::<Vec<_>>()
                 .join(", "),