diff --git a/src/compare/diff.rs b/src/compare/diff.rs
index 46d223a..7cd0b4a 100644
--- a/src/compare/diff.rs
+++ b/src/compare/diff.rs
@@ -402,7 +402,7 @@ pub fn compare_document<'b, 's>(
 }
 
 fn _compare_document<'b, 's>(
-    source: &'s str,
+    _source: &'s str,
     emacs: &'b Token<'s>,
     rust: &'b Document<'s>,
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
@@ -515,9 +515,9 @@ fn compare_section<'b, 's>(
     rust: &'b Section<'s>,
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
     let children = emacs.as_list()?;
-    let mut this_status = DiffStatus::Good;
+    let this_status = DiffStatus::Good;
     let mut child_status = Vec::new();
-    let mut message = None;
+    let message = None;
 
     for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
         child_status.push(compare_ast_node(source, emacs_child, rust_child.into())?);
@@ -1095,13 +1095,13 @@ fn compare_property_drawer<'b, 's>(
 }
 
 fn compare_node_property<'b, 's>(
-    source: &'s str,
+    _source: &'s str,
     emacs: &'b Token<'s>,
     rust: &'b NodeProperty<'s>,
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
     let child_status = Vec::new();
-    let mut this_status = DiffStatus::Good;
-    let mut message = None;
+    let this_status = DiffStatus::Good;
+    let message = None;
 
     // TODO: Compare :key :value
 
@@ -1188,8 +1188,8 @@ fn compare_table_row<'b, 's>(
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
     let children = emacs.as_list()?;
     let mut child_status = Vec::new();
-    let mut this_status = DiffStatus::Good;
-    let mut message = None;
+    let this_status = DiffStatus::Good;
+    let message = None;
 
     // TODO: Compare :type
     //
@@ -1211,14 +1211,14 @@ fn compare_table_row<'b, 's>(
 }
 
 fn compare_table_cell<'b, 's>(
-    source: &'s str,
+    _source: &'s str,
     emacs: &'b Token<'s>,
     rust: &'b TableCell<'s>,
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
     let children = emacs.as_list()?;
     let child_status = Vec::new();
-    let mut this_status = DiffStatus::Good;
-    let mut message = None;
+    let this_status = DiffStatus::Good;
+    let message = None;
 
     for (_emacs_child, _rust_child) in children.iter().skip(2).zip(rust.children.iter()) {}