diff --git a/src/graph.rs b/src/graph.rs
index a37a082..bfb0838 100644
--- a/src/graph.rs
+++ b/src/graph.rs
@@ -853,9 +853,9 @@ mod tests {
 			let rtype = &**rfunc.type_ref.read();
 			let elements::Type::Function(ref ftype) = rtype;
 
-			/// import deleted so now it's func #0
+			// import deleted so now it's func #0
 			assert_eq!(rfunc.order(), Some(0));
-			/// type should be the same, #1
+			// type should be the same, #1
 			assert_eq!(ftype.params().len(), 1);
 		}
 	}
@@ -981,4 +981,4 @@ mod tests {
 			"Call should be recalculated to 1"
 		);
 	}
-}
\ No newline at end of file
+}
diff --git a/src/ref_list.rs b/src/ref_list.rs
index f33e882..9e281cc 100644
--- a/src/ref_list.rs
+++ b/src/ref_list.rs
@@ -196,7 +196,7 @@ impl<T> RefList<T> {
 	}
 
 	fn done_delete(&mut self, indices: &[usize]) {
-		for mut entry in self.items.iter_mut() {
+		for entry in self.items.iter_mut() {
 			let mut entry = entry.write();
 			let total_less = indices.iter()
 				.take_while(|x| **x < entry.order().expect("Items in the list always have order; qed"))
@@ -209,7 +209,7 @@ impl<T> RefList<T> {
 
 		let mut total_removed = 0;
 		for idx in indices {
-			let mut detached = self.items.remove(*idx - total_removed);
+			let detached = self.items.remove(*idx - total_removed);
 			detached.write().index = EntryOrigin::Detached;
 			total_removed += 1;
 		}
@@ -559,4 +559,4 @@ mod tests {
 		assert_eq!(item50.order(), Some(6));
 		assert_eq!(item60.order(), Some(7));
 	}
-}
\ No newline at end of file
+}
diff --git a/src/stack_height/mod.rs b/src/stack_height/mod.rs
index 6674717..0f53394 100644
--- a/src/stack_height/mod.rs
+++ b/src/stack_height/mod.rs
@@ -214,7 +214,7 @@ fn instrument_functions(ctx: &mut Context, module: &mut elements::Module) -> Res
 	for section in module.sections_mut() {
 		if let elements::Section::Code(ref mut code_section) = *section {
 			for func_body in code_section.bodies_mut() {
-				let mut opcodes = func_body.code_mut();
+				let opcodes = func_body.code_mut();
 				instrument_function(ctx, opcodes)?;
 			}
 		}