Well the nashorn-nightly completed successfully at least so it seems:
http://javac.us.oracle.com/job/nashorn-nightly/3/console

But looking at the log files carefully, I see these failures.
     [java] Test(compile, run): test/script/external/test262/test/suite/ch15/15.9/15.9.5/S15.9.5_A41_T1.js
     [java] Test(compile, run): test/script/external/test262/test/suite/ch15/15.9/15.9.5/S15.9.5_A42_T1.js
     [java] Exception in thread "main" java.lang.AssertionError: TEST FAILED
     [java] at jdk.nashorn.internal.test.framework.ParallelTestRunner.run(ParallelTestRunner.java:416)
     [java] at jdk.nashorn.internal.test.framework.ParallelTestRunner.main(ParallelTestRunner.java:436)
     [java]
     [java] FAILED TESTS
     [java] Test(compile, run): test/script/external/test262/test/suite/ch10/10.1/10.1.1/10.1.1-23-s.js
     [java] java.lang.AssertionError: boolean, class java.lang.Object
     [java] Test(compile, run): test/script/external/test262/test/suite/ch10/10.1/10.1.1/10.1.1-24-s.js
     [java] java.lang.AssertionError: boolean, class java.lang.Object
     [java] Test(compile, run): test/script/external/test262/test/suite/ch10/10.6/10.6-6-4.js
     [java] java.lang.AssertionError: boolean, class java.lang.Object
     [java] Tests run: 11552/11552 tests, passed: 11549 (99.97%), failed: 3. Time elapsed: 49min 49s.
     [java] Java Result: 1
Kumar