diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index e74aa1c..e56d168 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -460,3 +460,9 @@
     )
   )
 )
+
+(deftest test-ya-declarado-localmente-01
+  (testing "Test 01 ya-declarado-localmente?"
+    (is (= (ya-declarado-localmente? 'Write [[0] [['io ['lib '()] 0] ['Write ['lib '()] 0] ['entero_a_hexa ['fn [(list ['n (symbol ":") 'i64]) 'String]] 2]]]) true))
+  )
+)