added test for KT-242

idea/testData/codegen/regressions/kt242.jet

@@ -0,0 +1,19 @@
+fun box() : String {
+    val i: Int? = 7
+    val j: Int? = null
+    val k = 7
+
+    //verify errors
+    if (i == 7) {}
+    if (7 == i) {}
+
+    if (j == 7) {}
+    if (7 == j) {}
+
+    if (i == k) {}
+    if (k == i) {}
+
+    if (j == k) {}
+    if (k == j) {}
+    return "OK"
+}

idea/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java

@@ -259,5 +259,7 @@ public class PrimitiveTypesTest extends CodegenTestCase {
         assertEquals(expected, main.invoke(null, arg1, arg2));
     }
 
-
+    public void testKt242 () throws Exception {
+        blackBoxFile("regressions/kt242.jet");
+    }
 }