Draft changes.

src/ludus/interpreter.cljc

@@ -664,16 +664,21 @@
       )
     ))
 
+(def state (atom {})) ;; for now use a global state atom
+
 (defn- interpret-ref [ast ctx]
   (let [data (:data ast)
         name (-> data first :data first) 
         expr (-> data second)]
     (when (contains? @ctx name)
       (throw (ex-info (str "Name " name " is already bound") {:ast ast})))
+    (when (contains? @state name)
+      (throw (ex-info (str "A ref already has " name " name") {:ast ast})))
     (let [value (interpret-ast expr ctx)
           box (atom value)
-          ref {::data/ref true ::data/value box ::data/name name}]
+          ref {::data/ref true ::data/value box ::data/name name ::data/state state}]
       (vswap! ctx update-ctx {name ref})
+      (swap! state assoc name ref)
       ref)))
 
 (defn- interpret-loop [ast ctx]

src/ludus/node.cljc

@@ -43,7 +43,7 @@
          post_tokens (:tokens post_scanned)
          post_parsed (p/apply-parser g/script post_tokens)
          post_result (i/interpret-safe source post_parsed {} false)
-         ludus_result (assoc post_result :result result_str :test test_results)
+         ludus_result (assoc post_result :result result_str :test test_results :state @i/state)
          clj_result (ld->clj ludus_result)
          ]
      (cond