refactor(xatu): retain node parsing scaffolding

src/xatu/rules.rs

@@ -37,10 +37,15 @@ pub trait TokenRule {
 }
 
 pub fn run_rules(file: &ast::ParsedFile) -> Vec<Diagnostic> {
-    file.tokens
+    let node_diagnostics = file.nodes.iter().flat_map(|_| std::iter::empty());
+    let token_diagnostics = file
+        .tokens
         .iter()
         .flat_map(|token| [run_token_rule::<UnquotedUri>(token)])
-        .flatten()
+        .flatten();
+
+    node_diagnostics
+        .chain(token_diagnostics)
         .map(|finding| Diagnostic {
             file_id: file.file_id,
             finding,