diff --git a/src/dfa.rs b/src/dfa.rs
index 79b1dcc..13097b5 100644
--- a/src/dfa.rs
+++ b/src/dfa.rs
@@ -29,8 +29,6 @@ pub(crate) trait ScopeExt: Sized {
         f(self);
         self
     }
-
-    fn drop(self) {}
 }
 
 impl<Any: Sized> ScopeExt for Any {}
diff --git a/src/error_strategy.rs b/src/error_strategy.rs
index 04025ad..dc7e4f9 100644
--- a/src/error_strategy.rs
+++ b/src/error_strategy.rs
@@ -581,7 +581,6 @@ impl<'input, Ctx: ParserNodeType<'input>> BailErrorStrategy<'input, Ctx> {
                 ctx.set_exception(e.clone());
                 ctx = ctx.get_parent()?
             }
-            Some(())
         })();
         return ANTLRError::FallThrough(Rc::new(ParseCancelledError(e.clone())));
     }
diff --git a/src/tree.rs b/src/tree.rs
index d27e641..bbcf02c 100644
--- a/src/tree.rs
+++ b/src/tree.rs
@@ -139,7 +139,7 @@ impl<'input, Node: ParserNodeType<'input>, T: 'static> CustomRuleContext<'input>
         usize::max_value()
     }
 
-    fn get_node_text(&self, rule_names: &[&str]) -> String {
+    fn get_node_text(&self, _rule_names: &[&str]) -> String {
         self.symbol.borrow().get_text().to_display()
     }
 }
@@ -289,14 +289,14 @@ pub trait ParseTreeVisitorCompat<'input>: VisitChildren<'input, Self::Node> {
         return result;
     }
 
-    fn aggregate_results(&self, aggregate: Self::Return, next: Self::Return) -> Self::Return {
+    fn aggregate_results(&self, _aggregate: Self::Return, next: Self::Return) -> Self::Return {
         next
     }
 
     fn should_visit_next_child(
         &self,
-        node: &<Self::Node as ParserNodeType<'input>>::Type,
-        current: &Self::Return,
+        _node: &<Self::Node as ParserNodeType<'input>>::Type,
+        _current: &Self::Return,
     ) -> bool {
         true
     }
diff --git a/src/utils.rs b/src/utils.rs
index ac6e1f6..797a761 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -15,8 +15,6 @@ pub fn escape_whitespaces(data: impl Borrow<str>, escape_spaces: bool) -> String
     res
 }
 
-pub trait Sealed {}
-
 pub fn cell_update<T: Copy, F>(cell: &Cell<T>, f: F) -> T
 where
     F: FnOnce(T) -> T,