Supported negated is operation.

translator/test/org/jetbrains/k2js/test/RTTITest.java

@@ -19,4 +19,9 @@ public class RTTITest extends AbstractClassTest {
         testFooBoxIsTrue("isSameClass.kt");
     }
 
+    @Test
+    public void notIsOtherClass() throws Exception {
+        testFooBoxIsTrue("notIsOtherClass.kt");
+    }
+
 }

translator/testFiles/rtti/cases/notIsOtherClass.kt

@@ -0,0 +1,11 @@
+namespace foo
+
+open class A() {
+
+}
+
+class B() : A() {
+
+}
+
+fun box() = (A() !is B)