Add use_brackets.

src/compare/compare_field.rs

@@ -159,3 +159,24 @@ pub(crate) fn compare_property_list_of_quoted_string<
     }
     Ok(None)
 }
+
+pub(crate) fn compare_property_boolean<'b, 's, 'x, R, RG: Fn(R) -> bool>(
+    emacs: &'b Token<'s>,
+    rust_node: R,
+    emacs_field: &'x str,
+    rust_value_getter: RG,
+) -> Result<Option<(DiffStatus, Option<String>)>, Box<dyn std::error::Error>> {
+    // get_property already converts nil to None.
+    let value = get_property(emacs, emacs_field)?.is_some();
+    let rust_value = rust_value_getter(rust_node);
+    if rust_value != value {
+        let this_status = DiffStatus::Bad;
+        let message = Some(format!(
+            "{} mismatch (emacs != rust) {:?} != {:?}",
+            emacs_field, value, rust_value
+        ));
+        Ok(Some((this_status, message)))
+    } else {
+        Ok(None)
+    }
+}