tools/javac/defaultMethods/Assertions.java fails if run with jtreg -enableassertions (-ea) option.

To reproduce:
jtreg -ea -jdk:$TEST_JAVA langtools/test/tools/javac/defaultMethods/Assertions.java

STDERR:
java.lang.IllegalStateException: AssertionError not expected, but thrown.
at test.Assertions.main(Assertions.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:484)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:745)

JavaTest Message: Test threw exception: java.lang.IllegalStateException: AssertionError not expected, but thrown.
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.IllegalStateException: AssertionError not expected, but thrown.


jtreg, version 4.1 fcs b09

java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b19)
Java HotSpot(TM) 64-Bit Server VM (build 1.9.0-ea-b19, mixed mode)