With the unit tests warnings were squashed by suppressing them with SuppressWarnings annotations, instead of
reparing the issues as was done with the source. Reasons being...
* The tests might be relying on the types as they were defined.
* If the tests were written to test against the correct forms they would've/should've stipulated those.
* Even unused members might be important to tests so we attempt to change as little as possible.
Due to the specification change of jigsaw, ClassLoader#defineClass()
cannot be invoked through reflection API. As a workaround,
--add-opens java.base/java.lang=ALL-UNNAMED
must be given to the JVM. The ant target "runtest9" adds this jvm
argument.