diff --git a/idea/testData/codegen/patternMatching/pattern.jet b/idea/testData/codegen/patternMatching/pattern.jet
new file mode 100644
index 00000000000..25f8167886a
--- /dev/null
+++ b/idea/testData/codegen/patternMatching/pattern.jet
@@ -0,0 +1,4 @@
+fun isString(x: Any) = when(x) {
+  is String => "string"
+  else => "something"
+}
diff --git a/idea/tests/org/jetbrains/jet/codegen/PatternMatchingTest.java b/idea/tests/org/jetbrains/jet/codegen/PatternMatchingTest.java
index 568442c6513..1cd98049184 100644
--- a/idea/tests/org/jetbrains/jet/codegen/PatternMatchingTest.java
+++ b/idea/tests/org/jetbrains/jet/codegen/PatternMatchingTest.java
@@ -34,4 +34,11 @@ public class PatternMatchingTest extends CodegenTestCase {
         }
         assertTrue(caught);
     }
+
+    public void _testPattern() throws Exception {
+        loadFile();
+        Method foo = generateFunction();
+        assertEquals("string", foo.invoke(null, ""));
+        assertEquals("something", foo.invoke(null, new Object()));
+    }
 }