diff --git a/resources/bytecode/javFiles/PaternMatchingHaskellStyle.jav b/resources/bytecode/javFiles/PaternMatchingHaskellStyle.jav
index 5d9cff2e..ba3e7771 100644
--- a/resources/bytecode/javFiles/PaternMatchingHaskellStyle.jav
+++ b/resources/bytecode/javFiles/PaternMatchingHaskellStyle.jav
@@ -9,6 +9,6 @@ public class PaternMatchingHaskellStyle {
    }
 
    public append(LinkedElem(a, r), l2) {
-   	  new LinkedElem<>(a, append(r, l2));
+   	  return new LinkedElem<>(a, append(r, l2));
    }
 }
diff --git a/src/test/java/TestComplete.java b/src/test/java/TestComplete.java
index 915c3d80..1d314087 100644
--- a/src/test/java/TestComplete.java
+++ b/src/test/java/TestComplete.java
@@ -854,6 +854,29 @@ public class TestComplete {
         assertEquals(m2.invoke(instance, 10), 10);
     }
 
+    @Ignore("Not implemented")
+    @Test
+    public void testOverloadPatternMatching() throws Exception {
+        var classFiles = generateClassFiles(new ByteArrayClassLoader(), "PaternMatchingHaskellStyle.jav");
+        var clazz = classFiles.get("PaternMatchingHaskellStyle");
+        var R2 = classFiles.get("Elem");
+        var R = classFiles.get("LinkedElem");
+        var I = classFiles.get("List");
+
+        var rctor = R.getDeclaredConstructor(Object.class, I);
+        var r2ctor = R2.getDeclaredConstructor(Object.class);
+
+        var instance = clazz.getDeclaredConstructor().newInstance();
+        var m = clazz.getDeclaredMethod("append", R, I);
+
+        //var x = rctor.newInstance(rctor.newInstance(0, rctor.newInstance(0, r2ctor.newInstance(0))), 0);
+        //var y = rctor.newInstance(r2ctor.newInstance(0), 0);
+
+        //assertEquals(m.invoke(instance, x, y), 10);
+        //assertEquals(m.invoke(instance, y, y), 40.0);
+
+    }
+
     @Test
     public void testOverloadSwitch() throws Exception {
         var classFiles = generateClassFiles(new ByteArrayClassLoader(), "SwitchOverload.jav");
@@ -868,7 +891,7 @@ public class TestComplete {
         var x = rctor.newInstance(10);
         var d = rctor.newInstance(20.0);
 
-        assertEquals(m.invoke(instance, x, 0), 50);
+        assertEquals(m.invoke(instance, x, 0), 10);
         assertEquals(m.invoke(instance, d, 0), 40.0);
     }