feat(natu): report expected let order

src/natu/rules.rs

@@ -22,6 +22,7 @@ pub struct Finding {
     pub range: ast::SourceRange,
     pub message: &'static str,
     pub binding: Option<String>,
+    pub expected_order: Option<Vec<String>>,
 }
 
 impl std::fmt::Display for Diagnostic {
@@ -79,7 +80,8 @@ pub fn run_rules(file: &ast::ParsedFile, graph: &ScopeGraph) -> Vec<Diagnostic>
         rule_id: "let_order",
         range: finding.range,
         message: "Let bindings must follow dependency order",
-        binding: Some(finding.binding),
+        binding: None,
+        expected_order: Some(finding.expected_order),
     });
 
     node_diagnostics
@@ -104,6 +106,7 @@ where
         range: node.range,
         message,
         binding: None,
+        expected_order: None,
     })
 }
 
@@ -119,5 +122,6 @@ where
         range: token.range,
         message,
         binding: None,
+        expected_order: None,
     })
 }