Implement a compare_property_numeric.

src/compare/diff.rs

@@ -10,6 +10,7 @@ use super::compare_field::compare_property_always_nil;
 use super::compare_field::compare_property_boolean;
 use super::compare_field::compare_property_list_of_ast_nodes;
 use super::compare_field::compare_property_list_of_quoted_string;
+use super::compare_field::compare_property_numeric;
 use super::compare_field::compare_property_quoted_string;
 use super::compare_field::compare_property_unquoted_atom;
 use super::elisp_fact::ElispFact;
@@ -594,6 +595,55 @@ fn compare_section<'b, 's>(
     .into())
 }
 
+fn new_compare_heading<'b, 's>(
+    source: &'s str,
+    emacs: &'b Token<'s>,
+    rust: &'b Heading<'s>,
+) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error + 's>> {
+    let mut this_status = DiffStatus::Good;
+    let mut child_status = Vec::new();
+    let mut message = None;
+
+    compare_children(
+        source,
+        emacs,
+        &rust.children,
+        &mut child_status,
+        &mut this_status,
+        &mut message,
+    )?;
+
+    for diff in compare_properties!(
+        source,
+        emacs,
+        rust,
+        (
+            EmacsField::Required(":level"),
+            |r| Some(r.level),
+            compare_property_numeric
+        )
+    ) {
+        match diff {
+            ComparePropertiesResult::NoChange => {}
+            ComparePropertiesResult::SelfChange(new_status, new_message) => {
+                this_status = new_status;
+                message = new_message
+            }
+            ComparePropertiesResult::DiffEntry(diff_entry) => child_status.push(diff_entry),
+        }
+    }
+
+    Ok(DiffResult {
+        status: this_status,
+        name: rust.get_elisp_name(),
+        message,
+        children: child_status,
+        rust_source: rust.get_source(),
+        emacs_token: emacs,
+    }
+    .into())
+}
+
 fn compare_heading<'b, 's>(
     source: &'s str,
     emacs: &'b Token<'s>,