feat(natu): report expected let order

src/natu/scope_graph.rs

@@ -26,7 +26,11 @@ impl ScopeGraph {
     fn build_expr(&mut self, expr: &ast::Expr, scope: NodeId) -> Vec<NodeId> {
         match expr {
             ast::Expr::Ident(ident) => vec![self.add_reference(&ident.name, scope)],
-            ast::Expr::Let { bindings, body } => self.build_let(bindings, body, scope),
+            ast::Expr::Let {
+                range,
+                bindings,
+                body,
+            } => self.build_let(*range, bindings, body, scope),
             ast::Expr::AttrSet(bindings) => bindings
                 .iter()
                 .flat_map(|binding| self.build_expr(&binding.value, scope))
@@ -48,6 +52,7 @@ impl ScopeGraph {
 
     fn build_let(
         &mut self,
+        range: ast::SourceRange,
         bindings: &[ast::Binding],
         body: &ast::Expr,
         parent: NodeId,
@@ -59,7 +64,6 @@ impl ScopeGraph {
                 declaration: self.add_declaration(&binding.key.name, scope),
                 name: binding.key.name.clone(),
                 references: Vec::new(),
-                range: binding.range,
             })
             .collect::<Vec<_>>();
 
@@ -74,6 +78,7 @@ impl ScopeGraph {
             .chain(entry_references.iter().copied())
             .collect();
         self.lets.push(LetScope {
+            range,
             bindings: graph_bindings,
             entry_references,
         });
@@ -181,6 +186,7 @@ struct Edge {
 
 #[derive(Debug)]
 pub(crate) struct LetScope {
+    pub(crate) range: ast::SourceRange,
     pub(crate) bindings: Vec<Binding>,
     pub(crate) entry_references: Vec<NodeId>,
 }
@@ -190,5 +196,4 @@ pub(crate) struct Binding {
     pub(crate) declaration: NodeId,
     pub(crate) name: String,
     pub(crate) references: Vec<NodeId>,
-    pub(crate) range: ast::SourceRange,
 }