!! operator

kotlin_lib.js modified, truthful description of MiscTest class added.

#KT-1960 fixed

js/js.tests/test/org/jetbrains/k2js/test/semantics/MiscTest.java

@@ -25,8 +25,7 @@ import static org.jetbrains.k2js.test.utils.JsTestUtils.failsOnEcmaV5;
 /**
  * @author Pavel Talanov
  *         <p/>
- *         This class contains tests that do not fall in any particular category
- *         most probably because that functionality has very little support
+ *         A messy class where all new tests go before they are sorted which never happens.
  */
 public final class MiscTest extends AbstractExpressionTest {
 
@@ -148,4 +147,12 @@ public final class MiscTest extends AbstractExpressionTest {
     }
 
 
+    public void testExclExclThrows() throws Exception {
+        try {
+            fooBoxTest();
+            fail();
+        }
+        catch (JavaScriptException e) {
+        }
+    }
 }