Fix lifetimes in the compare functions.

src/compare/diff.rs

@@ -363,7 +363,33 @@ fn compare_ast_node<'b, 's>(
         AstNode::TableCell(_) => todo!(),
         AstNode::Timestamp(node) => compare_timestamp(source, emacs, node),
     };
-    todo!()
+
+    let mut compare_result = match compare_result.unwrap_or_else(|e| {
+        DiffResult {
+            status: DiffStatus::Bad,
+            name: "error!".into(),
+            message: Some(e.to_string()),
+            children: Vec::new(),
+            rust_source: rust.get_standard_properties().get_source(),
+            emacs_token: emacs,
+        }
+        .into()
+    }) {
+        DiffEntry::DiffResult(inner) => inner,
+        DiffEntry::DiffLayer(_) => {
+            unreachable!("Layers are only interior to DiffResults of AST nodes.")
+        }
+    };
+
+    match compare_standard_properties(source, emacs, &rust) {
+        Err(err) => {
+            compare_result.status = DiffStatus::Bad;
+            compare_result.message = Some(err.to_string())
+        }
+        Ok(_) => {}
+    }
+
+    Ok(compare_result.into())
 }
 
 fn compare_element<'b, 's>(