diff --git a/compiler/testData/codegen/regressions/kt779.jet b/compiler/testData/codegen/regressions/kt779.jet
new file mode 100644
index 00000000000..12aa290eb67
--- /dev/null
+++ b/compiler/testData/codegen/regressions/kt779.jet
@@ -0,0 +1,3 @@
+val <T> Array<T>.length : Int get() = this.size
+
+fun box() = if(Array(10, {1}).length == 10) "OK" else "fail"
\ No newline at end of file
diff --git a/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java b/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java
index 5de65ac38f6..f14c34e279d 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java
@@ -12,6 +12,11 @@ public class ArrayGenTest extends CodegenTestCase {
 //        System.out.println(generateToText());
     }
 
+    public void testKt779 () throws Exception {
+        blackBoxFile("regressions/kt779.jet");
+//        System.out.println(generateToText());
+    }
+
     public void testCreateMultiInt () throws Exception {
         loadText("fun foo() = Array<Array<Int>> (5, { Array<Int>(it, {239}) })");
         Method foo = generateFunction();