refactor(xatu): reuse binding model for let order

src/xatu/ast.rs

@@ -36,20 +36,15 @@ pub enum NodeData {
 pub struct Binding {
     pub key: Ident,
     pub value: Expr,
+    pub references: Vec<Ident>,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct LetBlock {
-    pub bindings: Vec<LetBinding>,
+    pub bindings: Vec<Binding>,
     pub body_references: Vec<Ident>,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct LetBinding {
-    pub name: Ident,
-    pub references: Vec<Ident>,
-}
-
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Ident {
     pub name: String,