diff --git a/test/rustint/core_test.clj b/test/rustint/core_test.clj
index 0888e07..3a47b3c 100644
--- a/test/rustint/core_test.clj
+++ b/test/rustint/core_test.clj
@@ -510,3 +510,20 @@
           true))
   )
 )
+
+(deftest test-ya-declarado-localmente-04
+  (testing "Test 04 ya-declarado-localmente?"
+    (is (= (ya-declarado-localmente?
+             'Write
+             [
+              [0 2]
+              [
+               ['io ['lib '()] 0]
+               ['Write ['lib '()] 0]
+               ['entero_a_hexa ['fn [(list ['n (symbol ":") 'i64]) 'String]] 2]
+              ]
+            ]
+             )
+          false))
+  )
+)